The increased size limits for single-storey rear extensions that were previously time limited and due to expire on 30 May 2019 have now been made permanent by government.
Any such proposals will still be subject to the associated neighbour consultation scheme. This requires that the relevant Local Planning Authority is informed of the proposed work via a prior approval application.
An extension or to your house is considered to be permitted development, not requiring an application for planning permission, subject to the following limits and conditions:
 No more than half the area of land around the original house would be covered by additions or other buildings.
 No extension would be forward of the principal elevation or side elevation fronting a highway.
 No extension to be higher than the highest part of the roof.
 Single-storey rear extensions must not extend beyond the rear wall of the original house by more than eight metres if a detached house; or more than six metres for any other house.
If the house is in Article 2(3) designated land or a Site of Special Scientific Interest, this limit is reduced to four metres if a detached house; or three metres for any other house.
These limits are now permanent and subject to the neighbour consultation scheme. This requires that the relevant Local Planning Authority is informed of the proposed work via a prior approval application.
 A maximum height of a single-storey rear extension of four metres.
 Extensions of more than one storey must not extend beyond the rear wall of the original house by more than three metres.
 A maximum eaves height of an extension within two metres of the boundary of three metres.
 A maximum eaves and ridge height of extension no higher than the existing house.
 Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.
 Two-storey extensions no closer than seven metres to the rear boundary.
 The roof pitch of extensions higher than one storey to match the existing house.
 Materials to be similar in appearance to the existing house.
 No verandas, balconies or raised platforms.
 Upper-floor, side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor.
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 On Article 2(3) designated land no cladding of the exterior.
 On Article 2(3) designated land no side extensions.
Note 1
The term “original house” means the house as it was first built or as it stood on 1 July 1948 (if it was built before that date). Although you may not have built an extension to the house, a previous owner may have done so.
Note 2
Article 2(3) designated land is land within:
 a conservation area; or
 an area of outstanding natural beauty; or
 an area specified by the Secretary of State for the purposes of enhancement and protection of the natural beauty and amenity of the countryside; or
 the Broads; or
 a National Park; or
 a World Heritage Site
Note 3
The permitted development allowances described here apply to houses and not to:
 Flats and maisonettes
 Converted houses or houses created through the permitted development rights to change use
 Other buildings
 Areas where there may be a planning condition, Article 4 Direction or other restriction that limits permitted development rights