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Permitted development
    A.    The enlargement, improvement or other alteration of a dwellinghouse.

Development not permitted
    A.1    Development is not permitted by Class A if—


(a)  the cubic content of the resulting building would exceed the cubic content of the original dwellinghouse—


(i)  in the case of a terrace house or in the case of a dwellinghouse on article 1(5) land, by more than 50 cubic metres or 10 %, whichever is the greater,


(ii)  in any other case, by more than 70 cubic metres or 15%, whichever is the greater,


(iii)  in any case, by more than 115 cubic metres;


(b)  the part of the building enlarged, improved or altered would exceed in height the highest part of the roof of the original dwellinghouse;


(c)  the part of the building enlarged, improved or altered would be nearer to any highway which bounds the curtilage of the dwellinghouse than—


(i)  the part of the original dwellinghouse nearest to that highway, or


(ii)  any point 20 metres from that highway,
whichever is nearer to the highway;


(d)  in the case of development other than the insertion, enlargement, improvement or other alteration of a window in an existing wall of a dwellinghouse, the part of the building enlarged, improved or altered would be within 2 metres of the boundary of the curtilage of the dwellinghouse and would exceed 4 metres in height;


(e)  the total area of ground covered by buildings within the curtilage (other than the original dwellinghouse) would exceed 50% of the total area of the curtilage (excluding the ground area of the original dwellinghouse);


(f)  it would consist of or include the installation, alteration or replacement of a satellite antenna;


(g)  it would consist of or include the erection of a building within the curtilage of a listed building; or


(h)  it would consist of or include an alteration to any part of the roof.

    A.2    In the case of a dwellinghouse on any article 1(5) land, development is not permitted by Class A if it would consist of or include the cladding of any part of the exterior with stone, artificial stone, timber, plastic or tiles.

Interpretation of Class A
    A.3    For the purposes of Class A—


(a)  the erection within the curtilage of a dwellinghouse of any building with a cubic content greater than 10 cubic metres shall be treated as the enlargement of the dwellinghouse for all purposes (including calculating cubic content) where—


(i)  the dwellinghouse is on article 1(5) land, or


(ii)  in any other case, any part of that building would be within 5 metres of any part of the dwellinghouse;


(b)  where any part of the dwellinghouse would be within 5 metres of an existing building within the same curtilage, that building shall be treated as forming part of the resulting building for the purpose of calculating the cubic content.

Permitted development
    B.    The enlargement of a dwellinghouse consisting of an addition or alteration to its roof.

Development not permitted
    B.1    Development is not permitted by Class B if—


(a)  any part of the dwellinghouse would, as a result of the works, exceed the height of the highest part of the existing roof;


(b)  any part of the dwellinghouse would, as a result of the works, extend beyond the plane of any existing roof slope which fronts any highway;


(c)  it would increase the cubic content of the dwellinghouse by more than 40 cubic metres, in the case of a terrace house, or 50 cubic metres in any other case;


(d)  the cubic content of the resulting building would exceed the cubic content of the original dwellinghouse—


(i)  in the case of a terrace house by more than 50 cubic metres or 10%, whichever is the greater,


(ii)  in any other case, by more than 70 cubic metres or 15%, whichever is the greater, or


(iii)  in any case, by more than 115 cubic metres; or


(e)  the dwellinghouse is on article 1(5) land.

Permitted development
    C.    Any other alteration to the roof of a dwellinghouse.

Development not permitted
    C.1    Development is not permitted by Class C if it would result in a material alteration to the shape of the dwellinghouse.

Permitted development
    D.    The erection or construction of a porch outside any external door of a dwellinghouse.

Development not permitted
    D.1    Development is not permitted by Class D if—


(a)  the ground area (measured externally) of the structure would exceed 3 square metres;


(b)  any part of the structure would be more than 3 metres above ground level; or


(c)  any part of the structure would be within 2 metres of any boundary of the curtilage of the dwellinghouse with a highway.

Permitted development
    E.    The provision within the curtilage of a dwellinghouse of any building or enclosure, swimming or other pool required for a purpose incidental to the enjoyment of the dwellinghouse as such, or the maintenance, improvement or other alteration of such a building or enclosure.

Development not permitted
    E.1    Development is not permitted by Class E if—


(a)  it relates to a dwelling or a satellite antenna;


(b)  any part of the building or enclosure to be constructed or provided would be nearer to any highway which bounds the curtilage than—


(i)  the part of the original dwellinghouse nearest to that highway, or


(ii)  any point 20 metres from that highway,
whichever is nearer to the highway;


(c)  where the building to be constructed or provided would have a cubic content greater than 10 cubic metres, any part of it would be within 5 metres of any part of the dwellinghouse;


(d)  the height of that building or enclosure would exceed—


(i)  4 metres, in the case of a building with a ridged roof; or


(ii)  3 metres, in any other case;


(e)  the total area of ground covered by buildings or enclosures within the curtilage (other than the original dwellinghouse) would exceed 50% of the total area of the curtilage (excluding the ground area of the original dwellinghouse); or


(f)  in the case of any article 1(5) land or land within the curtilage of a listed building, it would consist of the provision, alteration or improvement of a building with a cubic content greater than 10 cubic metres.

Interpretation of Class E
    E.2    For the purposes of Class E—
"purpose incidental to the enjoyment of the dwellinghouse as such" includes the keeping of poultry, bees, pet animals, birds or other livestock for the domestic needs or personal enjoyment of the occupants of the dwellinghouse.

Permitted development
    F.    The provision within the curtilage of a dwellinghouse of a hard surface for any purpose incidental to the enjoyment of the dwellinghouse as such.

Permitted development
    G.    The erection or provision within the curtilage of a dwellinghouse of a container for the storage of oil for domestic heating.

Development not permitted
    G.1    Development is not permitted by Class G if—


(a)  the capacity of the container would exceed 3,500 litres;


(b)  any part of the container would be more than 3 metres above ground level; or


(c)  any part of the container would be nearer to any highway which bounds the curtilage than—


(i)  the part of the original building nearest to that highway, or


(ii)  any point 20 metres from that highway,
whichever is nearer to the highway.

Permitted development
    H.    The installation, alteration or replacement of a satellite antenna on a dwellinghouse or within the curtilage of a dwellinghouse.

Development not permitted
    H.1    Development is not permitted by Class H if—


(a)  the size of the antenna (excluding any projecting feed element, reinforcing rim, mountings and brackets) when measured in any dimension would exceed—


(i)  45 centimetres in the case of an antenna to be installed on a chimney;


(ii)  90 centimetres in the case of an antenna to be installed on or within the curtilage of a dwellinghouse on article 1(4) land other than on a chimney;


(iii)  70 centimetres in any other case;


(b)  the highest part of an antenna to be installed on a roof or a chimney would, when installed, exceed in height—


(i)  in the case of an antenna to be installed on a roof, the highest part of the roof;


(ii)  in the case of an antenna to be installed on a chimney, the highest part of the chimney;


(c)  there is any other satellite antenna on the dwellinghouse or within its curtilage;


(d)  in the case of article 1(5) land, it would consist of the installation of an antenna—


(i)  on a chimney;


(ii)  on a building which exceeds 15 metres in height;


(iii)  on a wall or roof slope which fronts a waterway in the Broads or a highway elsewhere.

Conditions
    H.2    Development is permitted by Class H subject to the following conditions—


(a)  an antenna installed on a building shall, so far as practicable, be sited so as to minimise its effect on the external appearance of the building;


(b)  an antenna no longer needed for the reception or transmission of microwave radio energy shall be removed as soon as reasonably practicable.

Interpretation of Part 1
    I.    For the purposes of Part 1—
"resulting building" means the dwellinghouse as enlarged, improved or altered, taking into account any enlargement, improvement or alteration to the original dwellinghouse, whether permitted by this Part or not; and


"terrace house" means a dwellinghouse situated in a row of three or more dwellinghouses used or designed for use as single dwellings, where—


(a)  it shares a party wall with, or has a main wall adjoining the main wall of, the dwellinghouse on either side; or


(b)  if it is at the end of a row, it shares a party wall with or has a main wall adjoining the main wall of a dwellinghouse which fulfils the requirements of sub-paragraph (a) above.

Permitted development
    A.    The erection, construction, maintenance, improvement or alteration of a gate, fence, wall or other means of enclosure.

Development not permitted
    A.1    Development is not permitted by Class A if—


(a)  the height of any gate, fence, wall or means of enclosure erected or constructed adjacent to a highway used by vehicular traffic would, after the carrying out of the development, exceed one metre above ground level;


(b)  the height of any other gate, fence, wall or means of enclosure erected or constructed would exceed two metres above ground level;


(c)  the height of any gate, fence, wall or other means of enclosure maintained, improved or altered would, as a result of the development, exceed its former height or the height referred to in sub-paragraph (a) or (b) as the height appropriate to it if erected or constructed, whichever is the greater; or


(d)  it would involve development within the curtilage of, or to a gate, fence, wall or other means of enclosure surrounding, a listed building.

Permitted development
    B.    The formation, laying out and construction of a means of access to a highway which is not a trunk road or a classified road, where that access is required in connection with development permitted by any Class in this Schedule (other than by Class A of this Part).

Permitted development
    C.    The painting of the exterior of any building or work.

Development not permitted
    C.1    Development is not permitted by Class C where the painting is for the purpose of advertisement, announcement or direction.

Interpretation of Class C
    C.2    In Class C, "painting" includes any application of colour.

Permitted development
    A.    Development consisting of a change of the use of a building to a use falling within Class A1 (shops) of the Schedule to the Use Classes Order from a use falling within Class A3 (food and drink) of that Schedule or from a use for the sale, or display for sale, of motor vehicles.

Permitted development
    B.    Development consisting of a change of the use of a building—


(a)  to a use for any purpose falling within Class B1 (business) of the Schedule to the Use Classes Order from any use falling within Class B2 (general industrial) or B8 (storage and distribution) of that Schedule;


(b)  to a use for any purpose falling within Class B8 (storage and distribution) of that Schedule from any use falling within Class B1 (business) or B2 (general industrial).

Development not permitted
    B.1    Development is not permitted by Class B where the change is to or from a use falling within Class B8 of that Schedule, if the change of use relates to more than 235 square metres of floor space in the building.

Permitted development
    C.    Development consisting of a change of use to a use falling within Class A2 (financial and professional services) of the Schedule to the Use Classes Order from a use falling within Class A3 (food and drink) of that Schedule.

Permitted development
    D.    Development consisting of a change of use of any premises with a display window at ground floor level to a use falling within Class A1 (shops) of the Schedule to the Use Classes Order from a use falling within Class A2 (financial and professional services) of that Schedule.

Permitted development
    E.    Development consisting of a change of the use of a building or other land from a use permitted by planning permission granted on an application, to another use which that permission would have specifically authorised when it was granted.

Development not permitted
    E.1    Development is not permitted by Class E if—


(a)  the application for planning permission referred to was made before the 5th December 1988;


(b)  it would be carried out more than 10 years after the grant of planning permission; or


(c)  it would result in the breach of any condition, limitation or specification contained in that planning permission in relation to the use in question.

Permitted development
    F.    Development consisting of a change of the use of a building—


(a)  to a mixed use for any purpose within Class A1 (shops) of the Schedule to the Use Classes Order and as a single flat, from a use for any purpose within Class A1 of that Schedule;


(b)  to a mixed use for any purpose within Class A2 (financial and professional services) of the Schedule to the Use Classes Order and as a single flat, from a use for any purpose within Class A2 of that Schedule;


(c)  where that building has a display window at ground floor level, to a mixed use for any purpose within Class A1 (shops) of the Schedule to the Use Classes Order and as a single flat, from a use for any purpose within Class A2 (financial and professional services) of that Schedule.

Conditions
    F.1    Development permitted by Class F is subject to the following conditions—


(a)  some or all of the parts of the building used for any purposes within Class A1 or Class A2, as the case may be, of the Schedule to the Use Classes Order shall be situated on a floor below the part of the building used as a single flat;


(b)  where the development consists of a change of use of any building with a display window at ground floor level, the ground floor shall not be used in whole or in part as the single flat;


(c)  the single flat shall not be used otherwise than as a dwelling (whether or not as a sole or main residence)—


(i)  by a single person or by people living together as a family, or


(ii)  by not more than six residents living together as a single household (including a household where care is provided for residents).

Interpretation of Class F
    F.2    For the purposes of Class F—
"care" means personal care for people in need of such care by reason of old age, disablement, past or present dependence on alcohol or drugs or past or present mental disorder.

Permitted development
    G.    Development consisting of a change of the use of a building—


(a)  to a use for any purpose within Class A1 (shops) of the Schedule to the Use Classes Order from a mixed use for any purpose within Class A1 of that Schedule and as a single flat;


(b)  to a use for any purpose within Class A2 (financial and professional services) of the Schedule to the Use Classes Order from a mixed use for any purpose within Class A2 of that Schedule and as a single flat;


(c)  where that building has a display window at ground floor level, to a use for any purpose within Class A1 (shops) of the Schedule to the Use Classes Order from a mixed use for any purpose within Class A2 (financial and professional services) of that Schedule and as a single flat.

Development not permitted
    G.1    Development is not permitted by Class G unless the part of the building used as a single flat was immediately prior to being so used used for any purpose within Class A1 or Class A2 of the Schedule to the Use Classes Order.

Permitted development
    A.    The provision on land of buildings, moveable structures, works, plant or machinery required temporarily in connection with and for the duration of operations being or to be carried out on, in, under or over that land or on land adjoining that land.

Development not permitted
    A.1    Development is not permitted by Class A if—


(a)  the operations referred to are mining operations, or


(b)  planning permission is required for those operations but is not granted or deemed to be granted.

Conditions
    A.2    Development is permitted by Class A subject to the conditions that, when the operations have been carried out—


(a)  any building, structure, works, plant or machinery permitted by Class A shall be removed, and


(b)  any adjoining land on which development permitted by Class A has been carried out shall, as soon as reasonably practicable, be reinstated to its condition before that development was carried out.

Permitted development
    B.    The use of any land for any purpose for not more than 28 days in total in any calendar year, of which not more than 14 days in total may be for the purposes referred to in paragraph B.2, and the provision on the land of any moveable structure for the purposes of the permitted use.

Development not permitted
    B.1    Development is not permitted by Class B if—


(a)  the land in question is a building or is within the curtilage of a building,


(b)  the use of the land is for a caravan site,


(c)  the land is, or is within, a site of special scientific interest and the use of the land is for—


(i)  a purpose referred to in paragraph B.2(b) or other motor sports;


(ii)  clay pigeon shooting; or


(iii)  any war game,


or


(d)  the use of the land is for the display of an advertisement.

Interpretation of Class B
    B.2    The purposes mentioned in Class B above are—


(a)  the holding of a market;


(b)  motor car and motorcycle racing including trials of speed, and practising for these activities.

    B.3    In Class B, "war game" means an enacted, mock or imaginary battle conducted with weapons which are designed not to injure (including smoke bombs, or guns or grenades which fire or spray paint or are otherwise used to mark other participants), but excludes military activities or training exercises organised by or with the authority of the Secretary of State for Defence.

Permitted development
    A.    The use of land, other than a building, as a caravan site in the circumstances referred to in paragraph A.2.

Condition
    A.1    Development is permitted by Class A subject to the condition that the use shall be discontinued when the circumstances specified in paragraph A.2 cease to exist, and all caravans on the site shall be removed as soon as reasonably practicable.

Interpretation of Class A
    A.2    The circumstances mentioned in Class A are those specified in paragraphs 2 to 10 of Schedule 1 to the 1960 Act (cases where a caravan site licence is not required), but in relation to those mentioned in paragraph 10 do not include use for winter quarters.

Permitted development
    B.    Development required by the conditions of a site licence for the time being in force under the 1960 Act.

Permitted development
    A.    The carrying out on agricultural land comprised in an agricultural unit of 5 hectares or more in area of—


(a)  works for the erection, extension or alteration of a building; or


(b)  any excavation or engineering operations,
which are reasonably necessary for the purposes of agriculture within that unit.

Development not permitted
    A.1    Development is not permitted by Class A if—


(a)  the development would be carried out on a separate parcel of land forming part of the unit which is less than 1 hectare in area;


(b)  it would consist of, or include, the erection, extension or alteration of a dwelling;


(c)  it would involve the provision of a building, structure or works not designed for agricultural purposes;


(d)  the ground area which would be covered by—


(i)  any works or structure (other than a fence) for accommodating livestock or any plant or machinery arising from engineering operations; or


(ii)  any building erected or extended or altered by virtue of Class A,
would exceed 465 square metres, calculated as described in paragraph D.2 below;


(e)  the height of any part of any building, structure or works within 3 kilometres of the perimeter of an aerodrome would exceed 3 metres;


(f)  the height of any part of any building, structure or works not within 3 kilometres of the perimeter of an aerodrome would exceed 12 metres;


(g)  any part of the development would be within 25 metres of a metalled part of a trunk road or classified road;


(h)  it would consist of, or include, the erection or construction of, or the carrying out of any works to, a building, structure or an excavation used or to be used for the accommodation of livestock or for the storage of slurry or sewage sludge where the building, structure or excavation is, or would be, within 400 metres of the curtilage of a protected building; or


(i)  it would involve excavations or engineering operations on or over article 1(6) land which are connected with fish farming.

Conditions
    A.2(1)    Development is permitted by Class A subject to the following conditions—


(a)  where development is carried out within 400 metres of the curtilage of a protected building, any building, structure, excavation or works resulting from the development shall not be used for the accommodation of livestock except in the circumstances described in paragraph D.3 below or for the storage of slurry or sewage sludge;


(b)  where the development involves—


(i)  the extraction of any mineral from the land (including removal from any disused railway embankment); or


(ii)  the removal of any mineral from a mineral-working deposit,
the mineral shall not be moved off the unit;


(c)  waste materials shall not be brought on to the land from elsewhere for deposit except for use in works described in Class A(a) or in the provision of a hard surface and any materials so brought shall be incorporated forthwith into the building or works in question.


    (2)  Subject to paragraph (3), development consisting of—


(a)  the erection, extension or alteration of a building;


(b)  the formation or alteration of a private way;


(c)  the carrying out of excavations or the deposit of waste material (where the relevant area, as defined in paragraph D.4 below, exceeds 0.5 hectare); or


(d)  the placing or assembly of a tank in any waters,
is permitted by Class A subject to the following conditions—


(i)  the developer shall, before beginning the development, apply to the local planning authority for a determination as to whether the prior approval of the authority will be required to the siting, design and external appearance of the building, the siting and means of construction of the private way, the siting of the excavation or deposit or the siting and appearance of the tank, as the case may be;


(ii)  the application shall be accompanied by a written description of the proposed development and of the materials to be used and a plan indicating the site together with any fee required to be paid;


(iii)  the development shall not be begun before the occurrence of one of the following—
(aa)  the receipt by the applicant from the local planning authority of a written notice of their determination that such prior approval is not required;
(bb)  where the local planning authority give the applicant notice within 28 days following the date of receiving his application of their determination that such prior approval is required, the giving of such approval; or
(cc)  the expiry of 28 days following the date on which the application was received by the local planning authority without the local planning authority making any determination as to whether such approval is required or notifying the applicant of their determination;


(iv)   
(aa)  where the local planning authority give the applicant notice that such prior approval is required the applicant shall display a site notice by site display on or near the land on which the proposed development is to be carried out, leaving the notice in position for not less than 21 days in the period of 28 days from the date on which the local planning authority gave the notice to the applicant;
(bb)  where the site notice is, without any fault or intention of the applicant, removed, obscured or defaced before the period of 21 days referred to in sub-paragraph (aa) has elapsed, he shall be treated as having complied with the requirements of that sub-paragraph if he has taken reasonable steps for protection of the notice and, if need be, its replacement;


(v)  the development shall, except to the extent that the local planning authority otherwise agree in writing, be carried out—
(aa)  where prior approval is required, in accordance with the details approved;
(bb)  where prior approval is not required, in accordance with the details submitted with the application; and


(vi)  the development shall be carried out—
(aa)  where approval has been given by the local planning authority, within a period of five years from the date on which approval was given;
(bb)  in any other case, within a period of five years from the date on which the local planning authority were given the information referred to in sub-paragraph (d)(ii).

    (3)  The conditions in paragraph (2) do not apply to the extension or alteration of a building if the building is not on article 1(6) land except in the case of a significant extension or a significant alteration.

    (4)  Development consisting of the significant extension or the significant alteration of a building may only be carried out once by virtue of Class A(a).

Permitted development
    B.    The carrying out on agricultural land comprised in an agricultural unit of not less than 0.4 but less than 5 hectares in area of development consisting of—


(a)  the extension or alteration of an agricultural building;


(b)  the installation of additional or replacement plant or machinery;


(c)  the provision, rearrangement or replacement of a sewer, main, pipe, cable or other apparatus;


(d)  the provision, rearrangement or replacement of a private way;


(e)  the provision of a hard surface;


(f)  the deposit of waste; or


(g)  the carrying out of any of the following operations in connection with fish farming, namely, repairing ponds and raceways; the installation of grading machinery, aeration equipment or flow meters and any associated channel; the dredging of ponds; and the replacement of tanks and nets,
where the development is reasonably necessary for the purposes of agriculture within the unit.

Development not permitted
    B.1    Development is not permitted by Class B if—


(a)  the development would be carried out on a separate parcel of land forming part of the unit which is less than 0.4 hectare in area;


(b)  the external appearance of the premises would be materially affected;


(c)  any part of the development would be within 25 metres of a metalled part of a trunk road or classified road;


(d)  it would consist of, or involve, the carrying out of any works to a building or structure used or to be used for the accommodation of livestock or the storage of slurry or sewage sludge where the building or structure is within 400 metres of the curtilage of a protected building; or


(e)  it would relate to fish farming and would involve the placing or assembly of a tank on land or in any waters or the construction of a pond in which fish may be kept or an increase (otherwise than by the removal of silt) in the size of any tank or pond in which fish may be kept.

    B.2    Development is not permitted by Class B(a) if—


(a)  the height of any building would be increased;


(b)  the cubic content of the original building would be increased by more than 10%;


(c)  any part of any new building would be more than 30 metres from the original building;


(d)  the development would involve the extension, alteration or provision of a dwelling;


(e)  any part of the development would be carried out within 5 metres of any boundary of the unit; or


(f)  the ground area of any building extended by virtue of Class B(a) would exceed 465 square metres.

    B.3    Development is not permitted by Class B(b) if—


(a)  the height of any additional plant or machinery within 3 kilometres of the perimeter of an aerodrome would exceed 3 metres;


(b)  the height of any additional plant or machinery not within 3 kilometres of the perimeter of an aerodrome would exceed 12 metres;


(c)  the height of any replacement plant or machinery would exceed that of the plant or machinery being replaced; or


(d)  the area to be covered by the development would exceed 465 square metres calculated as described in paragraph D.2 below.

    B.4    Development is not permitted by Class B(e) if the area to be covered by the development would exceed 465 square metres calculated as described in paragraph D.2 below.

Conditions
    B.5    Development permitted by Class B and carried out within 400 metres of the curtilage of a protected building is subject to the condition that any building which is extended or altered, or any works resulting from the development, shall not be used for the accommodation of livestock except in the circumstances described in paragraph D.3 below or for the storage of slurry or sewage sludge.

    B.6    Development consisting of the extension or alteration of a building situated on article 1(6) land or the provision, rearrangement or replacement of a private way on such land is permitted subject to—


(a)  the condition that the developer shall, before beginning the development, apply to the local planning authority for a determination as to whether the prior approval of the authority will be required to the siting, design and external appearance of the building as extended or altered or the siting and means of construction of the private way; and


(b)  the conditions set out in paragraphs A.2(2)(ii) to (vi) above.

    B.7    Development is permitted by Class B(f) subject to the following conditions—


(a)  that waste materials are not brought on to the land from elsewhere for deposit unless they are for use in works described in Class B(a), (d) or (e) and are incorporated forthwith into the building or works in question; and


(b)  that the height of the surface of the land will not be materially increased by the deposit.

Permitted development
    C.    The winning and working on land held or occupied with land used for the purposes of agriculture of any minerals reasonably necessary for agricultural purposes within the agricultural unit of which it forms part.

Development not permitted
    C.1    Development is not permitted by Class C if any excavation would be made within 25 metres of a metalled part of a trunk road or classified road.

Condition
    C.2    Development is permitted by Class C subject to the condition that no mineral extracted during the course of the operation shall be moved to any place outside the land from which it was extracted, except to land which is held or occupied with that land and is used for the purposes of agriculture.

Interpretation of Part 6
    D.1    For the purposes of Part 6—
"agricultural land" means land which, before development permitted by this Part is carried out, is land in use for agriculture and which is so used for the purposes of a trade or business, and excludes any dwellinghouse or garden;


"agricultural unit" means agricultural land which is occupied as a unit for the purposes of agriculture, including—


(a)  any dwelling or other building on that land occupied for the purpose of farming the land by the person who occupies the unit, or


(b)  any dwelling on that land occupied by a farmworker;


"building" does not include anything resulting from engineering operations;


"fish farming" means the breeding, rearing or keeping of fish or shellfish (which includes any kind of crustacean and mollusc);


"livestock" includes fish or shellfish which are farmed;


"protected building" means any permanent building which is normally occupied by people or would be so occupied, if it were in use for purposes for which it is apt; but does not include—


(i)  a building within the agricultural unit; or


(ii)  a dwelling or other building on another agricultural unit which is used for or in connection with agriculture;


"significant extension" and "significant alteration" mean any extension or alteration of the building where the cubic content of the original building would be exceeded by more than 10% or the height of the building as extended or altered would exceed the height of the original building;


"slurry" means animal faeces and urine (whether or not water has been added for handling); and


"tank" includes any cage and any other structure for use in fish farming.

    D.2    For the purposes of Part 6—


(a)  an area calculated as described in this paragraph comprises the ground area which would be covered by the proposed development, together with the ground area of any building (other than a dwelling), or any structure, works, plant, machinery, ponds or tanks within the same unit which are being provided or have been provided within the preceding two years and any part of which would be within 90 metres of the proposed development;


(b)  400 metres is to be measured along the ground.

    D.3    The circumstances referred to in paragraphs A.2(1)(a) and B.5 are—


(a)  that no other suitable building or structure, 400 metres or more from the curtilage of a protected building, is available to accommodate the livestock; and


(b)   


(i)  that the need to accommodate the livestock arises from—
(aa)  quarantine requirements; or
(bb)  an emergency due to another building or structure in which the livestock could otherwise be accommodated being unavailable because it has been damaged or destroyed by fire, flood or storm; or


(ii)  in the case of animals normally kept out of doors, they require temporary accommodation in a building or other structure—
(aa)  because they are sick or giving birth or newly born; or
(bb)  to provide shelter against extreme weather conditions.

    D.4    For the purposes of paragraph A.2(2)(c), the relevant area is the area of the proposed excavation or the area on which it is proposed to deposit waste together with the aggregate of the areas of all other excavations within the unit which have not been filled and of all other parts of the unit on or under which waste has been deposited and has not been removed.

    D.5    In paragraph A.2(2)(iv), "site notice" means a notice containing—


(a)  the name of the applicant,


(b)  the address or location of the proposed development,


(c)  a description of the proposed development and of the materials to be used,


(d)  a statement that the prior approval of the authority will be required to the siting, design and external appearance of the building, the siting and means of construction of the private way, the siting of the excavation or deposit or the siting and appearance of the tank, as the case may be,


(e)  the name and address of the local planning authority,
and which is signed and dated by or on behalf of the applicant.

    D.6    For the purposes of Class B—


(a)  the erection of any additional building within the curtilage of another building is to be treated as the extension of that building and the additional building is not to be treated as an original building;


(b)  where two or more original buildings are within the same curtilage and are used for the same undertaking they are to be treated as a single original building in making any measurement in connection with the extension or alteration of either of them.

    D.7    In Class C, "the purposes of agriculture" includes fertilising land used for the purposes of agriculture and the maintenance, improvement or alteration of any buildings, structures or works occupied or used for such purposes on land so used.

Permitted development
    A.    The carrying out on land used for the purposes of forestry, including afforestation, of development reasonably necessary for those purposes consisting of—


(a)  works for the erection, extension or alteration of a building;


(b)  the formation, alteration or maintenance of private ways;


(c)  operations on that land, or on land held or occupied with that land, to obtain the materials required for the formation, alteration or maintenance of such ways;


(d)  other operations (not including engineering or mining operations).

Development not permitted
    A.1    Development is not permitted by Class A if—


(a)  it would consist of or include the provision or alteration of a dwelling;


(b)  the height of any building or works within 3 kilometres of the perimeter of an aerodrome would exceed 3 metres in height; or


(c)  any part of the development would be within 25 metres of the metalled portion of a trunk road or classified road.

    A.2(1)    Subject to paragraph (3), development consisting of the erection of a building or the extension or alteration of a building or the formation or alteration of a private way is permitted by Class A subject to the following conditions—


(a)  the developer shall, before beginning the development, apply to the local planning authority for a determination as to whether the prior approval of the authority will be required to the siting, design and external appearance of the building or, as the case may be, the siting and means of construction of the private way;


(b)  the application shall be accompanied by a written description of the proposed development, the materials to be used and a plan indicating the site together with any fee required to be paid;


(c)  the development shall not be begun before the occurrence of one of the following—


(i)  the receipt by the applicant from the local planning authority of a written notice of their determination that such prior approval is not required;


(ii)  where the local planning authority give the applicant notice within 28 days following the date of receiving his application of their determination that such prior approval is required, the giving of such approval;


(iii)  the expiry of 28 days following the date on which the application was received by the local planning authority without the local planning authority making any determination as to whether such approval is required or notifying the applicant of their determination;


(d)   


(i)  where the local planning authority give the applicant notice that such prior approval is required the applicant shall display a site notice by site display on or near the land on which the proposed development is to be carried out, leaving the notice in position for not less than 21 days in the period of 28 days from the date on which the local planning authority gave the notice to the applicant;


(ii)  where the site notice is, without any fault or intention of the applicant, removed, obscured or defaced before the period of 21 days referred to in sub-paragraph (i) has elapsed, he shall be treated as having complied with the requirements of that sub-paragraph if he has taken reasonable steps for protection of the notice and, if need be, its replacement;


(e)  the development shall, except to the extent that the local planning authority otherwise agree in writing, be carried out—


(i)  where prior approval is required, in accordance with the details approved;


(ii)  where prior approval is not required, in accordance with the details submitted with the application;


(f)  the development shall be carried out—


(i)  where approval has been given by the local planning authority, within a period of five years from the date on which approval was given,


(ii)  in any other case, within a period of five years from the date on which the local planning authority were given the information referred to in sub-paragraph (b).


    (2)  In the case of development consisting of the significant extension or the significant alteration of the building such development may be carried out only once.

    (3)  Paragraph (1) does not preclude the extension or alteration of a building if the building is not on article 1(6) land except in the case of a significant extension or a significant alteration.

Interpretation of Class A
    A.3    For the purposes of Class A—
"significant extension" and "significant alteration" mean any extension or alteration of the building where the cubic content of the original building would be exceeded by more than 10% or the height of the building as extended or altered would exceed the height of the original building; and


"site notice" means a notice containing—


(a)  the name of the applicant,


(b)  the address or location of the proposed development,


(c)  a description of the proposed development and of the materials to be used,


(d)  a statement that the prior approval of the authority will be required to the siting, design and external appearance of the building or, as the case may be, the siting and means of construction of the private way,


(e)  the name and address of the local planning authority,
and which is signed and dated by or on behalf of the applicant.

Permitted development
    A.    The extension or alteration of an industrial building or a warehouse.

Development not permitted
    A.1    Development is not permitted by Class A if—


(a)  the building as extended or altered is to be used for purposes other than those of the undertaking concerned;


(b)  the building is to be used for a purpose other than—


(i)  in the case of an industrial building, the carrying out of an industrial process or the provision of employee facilities;


(ii)  in the case of a warehouse, storage or distribution or the provision of employee facilities;


(c)  the height of the building as extended or altered would exceed the height of the original building;


(d)  the cubic content of the original building would be exceeded by more than—


(i)  10%, in respect of development on any article 1(5) land, or


(ii)  25%, in any other case;


(e)  the floor space of the original building would be exceeded by more than—


(i)  500 square metres in respect of development on any article 1(5) land, or


(ii)  1,000 square metres in any other case;


(f)  the external appearance of the premises of the undertaking concerned would be materially affected;


(g)  any part of the development would be carried out within 5 metres of any boundary of the curtilage of the premises; or


(h)  the development would lead to a reduction in the space available for the parking or turning of vehicles.

Conditions
    A.2    Development is permitted by Class A subject to the conditions that any building extended or altered—


(a)  shall only be used—


(i)  in the case of an industrial building, for the carrying out of an industrial process for the purposes of the undertaking or the provision of employee facilities;


(ii)  in the case of a warehouse, for storage or distribution for the purposes of the undertaking or the provision of employee facilities;


(b)  shall not be used to provide employee facilities between 7.00 p.m. and 6.30 a.m. for employees other than those present at the premises of the undertaking for the purpose of their employment;


(c)  shall not be used to provide employee facilities if a notifiable quantity of a hazardous substance is present at the premises of the undertaking.

Interpretation of Class A
    A.3    For the purposes of Class A—


(a)  the erection of any additional building within the curtilage of another building (whether by virtue of Class A or otherwise) and used in connection with it is to be treated as the extension of that building, and the additional building is not to be treated as an original building;


(b)  where two or more original buildings are within the same curtilage and are used for the same undertaking, they are to be treated as a single original building in making any measurement;


(c)  "employee facilities" means social, care or recreational facilities provided for employees of the undertaking, including creche facilities provided for the children of such employees.

Permitted development
    B.    Development carried out on industrial land for the purposes of an industrial process consisting of—


(a)  the installation of additional or replacement plant or machinery,


(b)  the provision, rearrangement or replacement of a sewer, main, pipe, cable or other apparatus, or


(c)  the provision, rearrangement or replacement of a private way, private railway, siding or conveyor.

Development not permitted
    B.1    Development described in Class B(a) is not permitted if—


(a)  it would materially affect the external appearance of the premises of the undertaking concerned, or


(b)  any plant or machinery would exceed a height of 15 metres above ground level or the height of anything replaced, whichever is the greater.

Interpretation of Class B
    B.2    In Class B, "industrial land" means land used for the carrying out of an industrial process, including land used for the purposes of an industrial undertaking as a dock, harbour or quay, but does not include land in or adjacent to and occupied together with a mine.

Permitted development
    C.    The provision of a hard surface within the curtilage of an industrial building or warehouse to be used for the purpose of the undertaking concerned.

Permitted development
    D.    The deposit of waste material resulting from an industrial process on any land comprised in a site which was used for that purpose on 1st July 1948 whether or not the superficial area or the height of the deposit is extended as a result.

Development not permitted
    D.1    Development is not permitted by Class D if—


(a)  the waste material is or includes material resulting from the winning and working of minerals, or


(b)  the use on 1st July 1948 was for the deposit of material resulting from the winning and working of minerals.

Interpretation of Part 8
    E.    For the purposes of Part 8, in Classes A and C—
"industrial building" means a building used for the carrying out of an industrial process and includes a building used for the carrying out of such a process on land used as a dock, harbour or quay for the purposes of an industrial undertaking but does not include a building on land in or adjacent to and occupied together with a mine; and


"warehouse" means a building used for any purpose within Class B8 (storage or distribution) of the Schedule to the Use Classes Order but does not include a building on land in or adjacent to and occupied together with a mine.

Permitted development
    A.    The carrying out on land within the boundaries of an unadopted street or private way of works required for the maintenance or improvement of the street or way.

Interpretation of Class A
    A.1    For the purposes of Class A—
"unadopted street" means a street not being a highway maintainable at the public expense within the meaning of the Highways Act 1980^[29].

Permitted development
The carrying out of any works for the purposes of inspecting, repairing or renewing any sewer, main, pipe, cable or other apparatus, including breaking open any land for that purpose.

Permitted development
    A.    Development authorised by—


(a)  a local or private Act of Parliament,


(b)  an order approved by both Houses of Parliament, or


(c)  an order under section 14 or 16 of the Harbours Act 1964^[30](orders for securing harbour efficiency etc., and orders conferring powers for improvement, construction etc. of harbours)
which designates specifically the nature of the development authorised and the land upon which it may be carried out.

Condition
    A.1    Development is not permitted by Class A if it consists of or includes—


(a)  the erection, construction, alteration or extension of any building, bridge, aqueduct, pier or dam, or


(b)  the formation, laying out or alteration of a means of access to any highway used by vehicular traffic,
unless the prior approval of the appropriate authority to the detailed plans and specifications is first obtained.

Prior approvals
    A.2    The prior approval referred to in paragraph A.1 is not to be refused by the appropriate authority nor are conditions to be imposed unless they are satisfied that—


(a)  the development (other than the provision of or works carried out to a dam) ought to be and could reasonably be carried out elsewhere on the land; or


(b)  the design or external appearance of any building, bridge, aqueduct, pier or dam would injure the amenity of the neighbourhood and is reasonably capable of modification to avoid such injury.

Interpretation of Class A
    A. 3    In Class A, "appropriate authority" means—


(a)  in Greater London or a metropolitan county, the local planning authority,


(b)  in a National Park, outside a metropolitan county, the county planning authority,


(c)  in any other case, the district planning authority^[31].

Permitted development
    A.    The erection or construction and the maintenance, improvement or other alteration by a local authority or by an urban development corporation of—


(a)  any small ancillary building, works or equipment on land belonging to or maintained by them required for the purposes of any function exercised by them on that land otherwise than as statutory undertakers;


(b)  lamp standards, information kiosks, passenger shelters, public shelters and seats, telephone boxes, fire alarms, public drinking fountains, horse troughs, refuse bins or baskets, barriers for the control of people waiting to enter public service vehicles, and similar structures or works required in connection with the operation of any public service administered by them.

Interpretation of Class A
    A.1    For the purposes of Class A—
"urban development corporation" has the same meaning as in Part XVI of the Local Government, Planning and Land Act 1980^[32] (urban development).

    A.2    The reference in Class A to any small ancillary building, works or equipment is a reference to any ancillary building, works or equipment not exceeding 4 metres in height or 200 cubic metres in capacity.

Permitted development
    B.    The deposit by a local authority of waste material on any land comprised in a site which was used for that purpose on 1st July 1948 whether or not the superficial area or the height of the deposit is extended as a result.

Development not permitted
    B.1    Development is not permitted by Class B if the waste material is or includes material resulting from the winning and working of minerals.

Interpretation of Part 12
    C.    For the purposes of Part 12—
"local authority" includes a parish or community council.

Permitted development
    A.    The carrying out by a local highway authority on land outside but adjoining the boundary of an existing highway of works required for or incidental to the maintenance or improvement of the highway.

Permitted development
    A.    Development by a drainage body in, on or under any watercourse or land drainage works and required in connection with the improvement, maintenance or repair of that watercourse or those works.

Interpretation of Class A
    A.1    For the purposes of Class A—
"drainage body" has the same meaning as in section 72(1) of the Land Drainage Act 1991^[33] (interpretation) other than the National Rivers Authority.

Permitted development
    A.    Development by the National Rivers Authority, for the purposes of their functions, consisting of—


(a)  development not above ground level required in connection with conserving, redistributing or augmenting water resources,


(b)  development in, on or under any watercourse or land drainage works and required in connection with the improvement, maintenance or repair of that watercourse or those works,


(c)  the provision of a building, plant, machinery or apparatus in, on, over or under land for the purpose of survey or investigation,


(d)  the maintenance, improvement or repair of works for measuring the flow in any watercourse or channel,


(e)  any works authorised by or required in connection with an order made under section 73 of the Water Resources Act 1991^[34] (power to make ordinary and emergency drought orders),


(f)  any other development in, on, over or under their operational land, other than the provision of a building but including the extension or alteration of a building.

Development not permitted
    A.1    Development is not permitted by Class A if—


(a)  in the case of any Class A(a) development, it would include the construction of a reservoir,


(b)  in the case of any Class A(f) development, it would consist of or include the extension or alteration of a building so that—


(i)  its design or external appearance would be materially affected,


(ii)  the height of the original building would be exceeded, or the cubic content of the original building would be exceeded by more than 25%, or


(iii)  the floor space of the original building would be exceeded by more than 1,000 square metres,


or


(c)  in the case of any Class A(f) development, it would consist of the installation or erection of any plant or machinery exceeding 15 metres in height or the height of anything it replaces, whichever is the greater.

Condition
    A.2    Development is permitted by Class A(c) subject to the condition that, on completion of the survey or investigation, or at the expiration of six months from the commencement of the development concerned, whichever is the sooner, all such operations shall cease and all such buildings, plant, machinery and apparatus shall be removed and the land restored as soon as reasonably practicable to its former condition (or to any other condition which may be agreed with the local planning authority).

Permitted development
    A.    Development by or on behalf of a sewerage undertaker consisting of—


(a)  development not above ground level required in connection with the provision, improvement, maintenance or repair of a sewer, outfall pipe, sludge main or associated apparatus;


(b)  the provision of a building, plant, machinery or apparatus in, on, over or under land for the purpose of survey or investigation;


(c)  the maintenance, improvement or repair of works for measuring the flow in any watercourse or channel;


(d)  any works authorised by or required in connection with an order made under section 73 of the Water Resources Act 1991 (power to make ordinary and emergency drought orders);


(e)  any other development in, on, over or under their operational land, other than the provision of a building but including the extension or alteration of a building.

Development not permitted
    A.1    Development is not permitted by Class A(e) if—


(a)  it would consist of or include the extension or alteration of a building so that—


(i)  its design or external appearance would be materially affected;


(ii)  the height of the original building would be exceeded, or the cubic content of the original building would be exceeded, by more than 25%; or


(iii)  the floor space of the original building would be exceeded by more than 1,000 square metres;


or


(b)  it would consist of the installation or erection of any plant or machinery exceeding 15 metres in height or the height of anything it replaces, whichever is the greater.

Condition
    A.2    Development is permitted by Class A(b) subject to the condition that, on completion of the survey or investigation, or at the expiration of 6 months from the commencement of the development concerned, whichever is the sooner, all such operations shall cease and all such buildings, plant, machinery and apparatus shall be removed and the land restored as soon as reasonably practicable to its former condition (or to any other condition which may be agreed with the local planning authority).

Interpretation of Class A
    A.3    For the purposes of Class A—
"associated apparatus", in relation to any sewer, main or pipe, means pumps, machinery or apparatus associated with the relevant sewer, main or pipe;


"sludge main" means a pipe or system of pipes (together with any pumps or other machinery or apparatus associated with it) for the conveyance of the residue of water or sewage treated in a water or sewage treatment works as the case may be, including final effluent or the products of the dewatering or incineration of such residue, or partly for any of those purposes and partly for the conveyance of trade effluent or its residue.

Permitted development
    A.    Development by railway undertakers on their operational land, required in connection with the movement of traffic by rail.

Development not permitted
    A.1    Development is not permitted by Class A if it consists of or includes—


(a)  the construction of a railway,


(b)  the construction or erection of a hotel, railway station or bridge, or


(c)  the construction or erection otherwise than wholly within a railway station of—


(i)  an office, residential or educational building, or a building used for an industrial process, or


(ii)  a car park, shop, restaurant, garage, petrol filling station or other building or structure provided under transport legislation.

Interpretation of Class A
    A.2    For the purposes of Class A, references to the construction or erection of any building or structure include references to the reconstruction or alteration of a building or structure where its design or external appearance would be materially affected.

Permitted development
    B.    Development on operational land by statutory undertakers or their lessees in respect of dock, pier, harbour, water transport, or canal or inland navigation undertakings, required—


(a)  for the purposes of shipping, or


(b)  in connection with the embarking, disembarking, loading, discharging or transport of passengers, livestock or goods at a dock, pier or harbour, or with the movement of traffic by canal or inland navigation or by any railway forming part of the undertaking.

Development not permitted
    B.1    Development is not permitted by Class B if it consists of or includes—


(a)  the construction or erection of a hotel, or of a bridge or other building not required in connection with the handling of traffic,


(b)  the construction or erection otherwise than wholly within the limits of a dock, pier or harbour of—


(i)  an educational building, or


(ii)  a car park, shop, restaurant, garage, petrol filling station or other building provided under transport legislation.

Interpretation of Class B
    B.2    For the purposes of Class B, references to the construction or erection of any building or structure include references to the reconstruction or alteration of a building or structure where its design or external appearance would be materially affected, and the reference to operational land includes land designated by an order made under section 14 or 16 of the Harbours Act 1964^[35] (orders for securing harbour efficiency etc., and orders conferring powers for improvement, construction etc. of harbours), and which has come into force, whether or not the order was subject to the provisions of the Statutory Orders (Special Procedure) Act 1945^[36].

Permitted development
    C.    The improvement, maintenance or repair of an inland waterway (other than a commercial waterway or cruising waterway) to which section 104 of the Transport Act 1968^[37] (classification of the Board's waterways) applies, and the repair or maintenance of a culvert, weir, lock, aqueduct, sluice, reservoir, let-off valve or other work used in connection with the control and operation of such a waterway.

Permitted development
    D.    The use of any land by statutory undertakers in respect of dock, pier, harbour, water transport, canal or inland navigation undertakings for the spreading of any dredged material.

Permitted development
    E.    Development for the purposes of their undertaking by statutory undertakers for the supply of water or hydraulic power consisting of—


(a)  development not above ground level required in connection with the supply of water or for conserving, redistributing or augmenting water resources, or for the conveyance of water treatment sludge,


(b)  development in, on or under any watercourse and required in connection with the improvement or maintenance of that watercourse,


(c)  the provision of a building, plant, machinery or apparatus in, on, over or under land for the purpose of survey or investigation,


(d)  the maintenance, improvement or repair of works for measuring the flow in any watercourse or channel,


(e)  the installation in a water distribution system of a booster station, valve house, meter or switch-gear house,


(f)  any works authorised by or required in connection with an order made under section 73 of the Water Resources Act 1991^[38] (power to make ordinary and emergency drought orders),


(g)  any other development in, on, over or under operational land other than the provision of a building but including the extension or alteration of a building.

Development not permitted
    E.1    Development is not permitted by Class E if—


(a)  in the case of any Class E(a) development, it would include the construction of a reservoir,


(b)  in the case of any Class E(e) development involving the installation of a station or house exceeding 29 cubic metres in capacity, that installation is carried out at or above ground level or under a highway used by vehicular traffic,


(c)  in the case of any Class E(g) development, it would consist of or include the extension or alteration of a building so that—


(i)  its design or external appearance would be materially affected;


(ii)  the height of the original building would be exceeded, or the cubic content of the original building would be exceeded by more than 25%, or


(iii)  the floor space of the original building would be exceeded by more than 1,000 square metres, or


(d)  in the case of any Class E(g) development, it would consist of the installation or erection of any plant or machinery exceeding 15 metres in height or the height of anything it replaces, whichever is the greater.

Condition
    E.2    Development is permitted by Class E(c) subject to the condition that, on completion of the survey or investigation, or at the expiration of six months from the commencement of the development, whichever is the sooner, all such operations shall cease and all such buildings, plant, machinery and apparatus shall be removed and the land restored as soon as reasonably practicable to its former condition (or to any other condition which may be agreed with the local planning authority).

Permitted development
    F.    Development by a public gas supplier required for the purposes of its undertaking consisting of—


(a)  the laying underground of mains, pipes or other apparatus;


(b)  the installation in a gas distribution system of apparatus for measuring, recording, controlling or varying the pressure, flow or volume of gas, and structures for housing such apparatus;


(c)  the construction in any storage area or protective area specified in an order made under section 4 of the Gas Act 1965^[39] (storage authorisation orders), of boreholes, and the erection or construction in any such area of any plant or machinery required in connection with the construction of such boreholes;


(d)  the placing and storage on land of pipes and other apparatus to be included in a main or pipe which is being or is about to be laid or constructed in pursuance of planning permission granted or deemed to be granted under Part III of the Act (control over development);


(e)  the erection on operational land of the public gas supplier of a building solely for the protection of plant or machinery;


(f)  any other development carried out in, on, over or under the operational land of the public gas supplier.

Development not permitted
    F.1    Development is not permitted by Class F if—


(a)  in the case of any Class F(b) development involving the installation of a structure for housing apparatus exceeding 29 cubic metres in capacity, that installation would be carried out at or above ground level, or under a highway used by vehicular traffic,


(b)  in the case of any Class F(c) development—


(i)  the borehole is shown in an order approved by the Secretary of State for Trade and Industry for the purpose of section 4(6) of the Gas Act 1965; or


(ii)  any plant or machinery would exceed 6 metres in height, or


(c)  in the case of any Class F(e) development, the building would exceed 15 metres in height, or


(d)  in the case of any Class F(f) development—


(i)  it would consist of or include the erection of a building, or the reconstruction or alteration of a building where its design or external appearance would be materially affected;


(ii)  it would involve the installation of plant or machinery exceeding 15 metres in height, or capable without the carrying out of additional works of being extended to a height exceeding 15 metres; or


(iii)  it would consist of or include the replacement of any plant or machinery, by plant or machinery exceeding 15 metres in height or exceeding the height of the plant or machinery replaced, whichever is the greater.

Conditions
    F.2    Development is permitted by Class F subject to the following conditions—


(a)  in the case of any Class F(a) development, not less than eight weeks before the beginning of operations to lay a notifiable pipe-line, the public gas supplier shall give notice in writing to the local planning authority of its intention to carry out that development, identifying the land under which the pipe-line is to be laid,


(b)  in the case of any Class F(d) development, on completion of the laying or construction of the main or pipe, or at the expiry of a period of nine months from the beginning of the development, whichever is the sooner, any pipes or other apparatus still stored on the land shall be removed and the land restored as soon as reasonably practicable to its condition before the development took place (or to any other condition which may be agreed with the local planning authority),


(c)  in the case of any Class F(e) development, approval of the details of the design and external appearance of the building shall be obtained, before the development is begun, from—


(i)  in Greater London or a metropolitan county, the local planning authority,


(ii)  in a National Park, outside a metropolitan county, the county planning authority,


(iii)  in any other case, the district planning authority^[40].

Permitted development
    G.    Development by statutory undertakers for the generation, transmission or supply of electricity for the purposes of their undertaking consisting of—


(a)  the installation or replacement in, on, over or under land of an electric line and the construction of shafts and tunnels and the installation or replacement of feeder or service pillars or transforming or switching stations or chambers reasonably necessary in connection with an electric line;


(b)  the installation or replacement of any telecommunications line which connects any part of an electric line to any electrical plant or building, and the installation or replacement of any support for any such line;


(c)  the sinking of boreholes to ascertain the nature of the subsoil and the installation of any plant or machinery reasonably necessary in connection with such boreholes;


(d)  the extension or alteration of buildings on operational land;


(e)  the erection on operational land of the undertaking of a building solely for the protection of plant or machinery;


(f)  any other development carried out in, on, over or under the operational land of the undertaking.

Development not permitted
    G.1    Development is not permitted by Class G if—


(a)  in the case of any Class G(a) development—


(i)  it would consist of or include the installation or replacement of an electric line to which section 37(1) of the Electricity Act 1989^[41] (consent required for overhead lines) applies; or


(ii)  it would consist of or include the installation or replacement at or above ground level or under a highway used by vehicular traffic, of a chamber for housing apparatus and the chamber would exceed 29 cubic metres in capacity;


(b)  in the case of any Class G(b) development—


(i)  the development would take place in a National Park, an area of outstanding natural beauty, or a site of special scientific interest;


(ii)  the height of any support would exceed 15 metres; or


(iii)  the telecommunications line would exceed 1,000 metres in length;


(c)  in the case of any Class G(d) development—


(i)  the height of the original building would be exceeded;


(ii)  the cubic content of the original building would be exceeded by more than 25% or, in the case of any building on article 1(5) land, by more than 10%, or


(iii)  the floor space of the original building would be exceeded by more than 1,000 square metres or, in the case of any building on article 1(5) land, by more than 500 square metres;


(d)  in the case of any Class G(e) development, the building would exceed 15 metres in height, or


(e)  in the case of any Class G(f) development, it would consist of or include—


(i)  the erection of a building, or the reconstruction or alteration of a building where its design or external appearance would be materially affected, or


(ii)  the installation or erection by way of addition or replacement of any plant or machinery exceeding 15 metres in height or the height of any plant or machinery replaced, whichever is the greater.

Conditions
    G.2    Development is permitted by Class G subject to the following conditions—


(a)  in the case of any Class G(a) development consisting of or including the replacement of an existing electric line, compliance with any conditions contained in a planning permission relating to the height, design or position of the existing electric line which are capable of being applied to the replacement line;


(b)  in the case of any Class G(a) development consisting of or including the installation of a temporary electric line providing a diversion for an existing electric line, on the ending of the diversion or at the end of a period of six months from the completion of the installation (whichever is the sooner) the temporary electric line shall be removed and the land on which any operations have been carried out to install that line shall be restored as soon as reasonably practicable to its condition before the installation took place;


(c)  in the case of any Class G(c) development, on the completion of that development, or at the end of a period of six months from the beginning of that development (whichever is the sooner) any plant or machinery installed shall be removed and the land shall be restored as soon as reasonably practicable to its condition before the development took place;


(d)  in the case of any Class G(e) development, approval of details of the design and external appearance of the buildings shall be obtained, before development is begun, from—


(i)  in Greater London or a metropolitan county, the local planning authority,


(ii)  in a National Park, outside a metropolitan county, the county planning authority,


(iii)  in any other case, the district planning authority^[42].

Interpretation of Class G
    G.3    For the purposes of Class G(a), "electric line" has the meaning assigned to that term by section 64(1) of the Electricity Act 1989 (interpretation etc. of Part 1).

    G.4    For the purposes of Class G(b), "electrical plant" has the meaning assigned to that term by the said section 64(1) and "telecommunications line" means a wire or cable (including its casing or coating) which forms part of a telecommunication apparatus within the meaning assigned to that term by paragraph 1 of Schedule 2 to the Telecommunications Act 1984^[43] (the telecommunications code).

    G.5    For the purposes of Class G(d), (e) and (f), the land of the holder of a licence under section 6(2) of the Electricity Act 1989 (licences authorising supply etc.) shall be treated as operational land if it would be operational land within section 263 of the Act^[44] (meaning of "operational land") if such licence holders were statutory undertakers for the purpose of that section.

Permitted development
    H.    Development required for the purposes of the carrying on of any tramway or road transport undertaking consisting of—


(a)  the installation of posts, overhead wires, underground cables, feeder pillars or transformer boxes in, on, over or adjacent to a highway for the purpose of supplying current to public service vehicles;


(b)  the installation of tramway tracks, and conduits, drains and pipes in connection with such tracks for the working of tramways;


(c)  the installation of telephone cables and apparatus, huts, stop posts and signs required in connection with the operation of public service vehicles;


(d)  the erection or construction and the maintenance, improvement or other alteration of passenger shelters and barriers for the control of people waiting to enter public service vehicles;


(e)  any other development on operational land of the undertaking.

Development not permitted
    H.1    Development is not permitted by Class H if it would consist of—


(a)  in the case of any Class H(a) development, the installation of a structure exceeding 17 cubic metres in capacity,


(b)  in the case of any Class H(e) development—


(i)  the erection of a building or the reconstruction or alteration of a building where its design or external appearance would be materially affected,


(ii)  the installation or erection by way of addition or replacement of any plant or machinery which would exceed 15 metres in height or the height of any plant or machinery it replaces, whichever is the greater,


(iii)  development, not wholly within a bus or tramway station, in pursuance of powers contained in transport legislation.

Permitted development
    I.    Development required for the purposes of the functions of a general or local lighthouse authority under the Merchant Shipping Act 1894^[45] and any other statutory provision made with respect to a local lighthouse authority, or in the exercise by a local lighthouse authority of rights, powers or duties acquired by usage prior to the 1894 Act.

Development not permitted
    I.1    Development is not permitted by Class I if it consists of or includes the erection of offices, or the reconstruction or alteration of offices where their design or external appearance would be materially affected.

Permitted development
    J.    Development required for the purposes of the Post Office consisting of—


(a)  the installation of posting boxes or self-service machines,


(b)  any other development carried out in, on, over or under the operational land of the undertaking.

Development not permitted
    J.1    Development is not permitted by Class J if—


(a)  it would consist of or include the erection of a building, or the reconstruction or alteration of a building where its design or external appearance would be materially affected, or


(b)  it would consist of or include the installation or erection by way of addition or replacement of any plant or machinery which would exceed 15 metres in height or the height of any existing plant or machinery, whichever is the greater.

Interpretation of Part 17
    K.    For the purposes of Part 17—
"transport legislation" means section 14(1)(d) of the Transport Act 1962^[46] (supplemental provisions relating to the Boards' powers) or section 10(1)(x) of the Transport Act 1968^[47] (general powers of Passenger Transport Executive).

Permitted development
    A.    The carrying out on operational land by a relevant airport operator or its agent of development (including the erection or alteration of an operational building) in connection with the provision of services and facilities at a relevant airport.

Development not permitted
    A.1    Development is not permitted by Class A if it would consist of or include—


(a)  the construction or extension of a runway;


(b)  the construction of a passenger terminal the floor space of which would exceed 500 square metres;


(c)  the extension or alteration of a passenger terminal, where the floor space of the building as existing at 5th December 1988 or, if built after that date, of the building as built, would be exceeded by more than 15%;


(d)  the erection of a building other than an operational building;


(e)  the alteration or reconstruction of a building other than an operational building, where its design or external appearance would be materially affected.

Condition
    A.2    Development is permitted by Class A subject to the condition that the relevant airport operator consults the local planning authority before carrying out any development, unless that development falls within the description in paragraph A.4.

Interpretation of Class A
    A.3    For the purposes of paragraph A.1, floor space shall be calculated by external measurement and without taking account of the floor space in any pier or satellite.

    A.4    Development falls within this paragraph if—


(a)  it is urgently required for the efficient running of the airport, and


(b)  it consists of the carrying out of works, or the erection or construction of a structure or of an ancillary building, or the placing on land of equipment, and the works, structure, building, or equipment do not exceed 4 metres in height or 200 cubic metres in capacity.

Permitted development
    B.    The carrying out on operational land within the perimeter of a relevant airport by a relevant airport operator or its agent of development in connection with—


(a)  the provision of air traffic control services,


(b)  the navigation of aircraft using the airport, or


(c)  the monitoring of the movement of aircraft using the airport.

Permitted development
    C.    The carrying out on operational land outside but within 8 kilometres of the perimeter of a relevant airport, by a relevant airport operator or its agent, of development in connection with—


(a)  the provision of air traffic control services,


(b)  the navigation of aircraft using the airport, or


(c)  the monitoring of the movement of aircraft using the airport.

Development not permitted
    C.1    Development is not permitted by Class C if—


(a)  any building erected would be used for a purpose other than housing equipment used in connection with the provision of air traffic control services, with assisting the navigation of aircraft, or with monitoring the movement of aircraft using the airport;


(b)  any building erected would exceed a height of 4 metres;


(c)  it would consist of the installation or erection of any radar or radio mast, antenna or other apparatus which would exceed 15 metres in height, or, where an existing mast, antenna or apparatus is replaced, the height of that mast, antenna or apparatus, if greater.

Permitted development
    D.    The carrying out by the Civil Aviation Authority or its agents, within the perimeter of an airport at which the Authority provides air traffic control services, of development in connection with—


(a)  the provision of air traffic control services,


(b)  the navigation of aircraft using the airport, or


(c)  the monitoring of the movement of aircraft using the airport.

Permitted development
    E.    The carrying out on operational land of the Civil Aviation Authority by the Authority or its agents of development in connection with—


(a)  the provision of air traffic control services,


(b)  the navigation of aircraft, or


(c)  monitoring the movement of aircraft.

Development not permitted
    E.1    Development is not permitted by Class E if—


(a)  any building erected would be used for a purpose other than housing equipment used in connection with the provision of air traffic control services, assisting the navigation of aircraft or monitoring the movement of aircraft;


(b)  any building erected would exceed a height of 4 metres; or


(c)  it would consist of the installation or erection of any radar or radio mast, antenna or other apparatus which would exceed 15 metres in height, or, where an existing mast, antenna or apparatus is replaced, the height of that mast, antenna or apparatus, if greater.

Permitted development
    F.    The use of land by or on behalf of the Civil Aviation Authority in an emergency to station moveable apparatus replacing unserviceable apparatus.

Condition
    F.1    Development is permitted by Class F subject to the condition that on or before the expiry of a period of six months beginning with the date on which the use began, the use shall cease, and any apparatus shall be removed, and the land shall be restored to its condition before the development took place, or to any other condition as may be agreed in writing between the local planning authority and the developer.

Permitted development
    G.    The use of land by or on behalf of