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Due to essential maintenance our online forms and Public Access (planning, building control and licensing online) service will be unavailable Saturday 22 June 2019 between approximately 9am and 1pm. We apologise for any inconvenience this may cause.

Extensions and additions to your home

Adding an extension or addition to your house is considered to be permitted development, providing that it meets certain conditions. You must ensure that your house does benefit from permitted development rights.

Please note changes to permitted development rights that came into effect on 30 May 2013.

Larger house extensions – neighbour consultation scheme

For a period of three years householders are able to build larger single storey rear extensions under permitted development.

This new legislation relates to single storey rear extensions (between 3 metres and 6 metres for a terraced/semi-detached house, and between 4 metres and 8 metres for detached houses).

Further information on these changes can be found in the DCLG guidance.

If you wish to build a larger house extension you are required to notify us. You can use the form below.

You may not need to apply for planning permission if the proposal meets the following criteria:

  • the extension (including previous extensions) would not exceed 50% of the total area of land around the original house
  • the extension would not exceed the height of the highest part of the roof and the eaves of the extension would not be higher than the height of the eaves of the house
  • the extension would not be set forward of the principal elevation or side elevation of the house and fronting a highway
  • the extension would not project beyond the rear wall of the original house by more than 4 metres if it is a detached house, or by 3 metres if it is another type of house
  • the height of a side extension would not be higher than four metres above ground level
  • the extension would be less than 3 metres deep and it would not be within 7 metres from the rear site boundary and the extension is more than one storey
  • the eaves height of an extension would not be more than 3 metres and it is within 2 metres from the boundary
  • the side extension would not be more than 4 metres in height, and its width would be less than half the width of the original house and it would not be more than one storey
  • external materials to be used would be similar to those of the existing house, however will not apply when the extension is a conservatory
  • any upper-floor window in a wall or roof slope in a side elevation would be obscure glazed and non-opening unless the parts which can be opened are more than 1.7 metres above the floor of the room in which it is installed
  • the roof pitch of the extension would match the roof pitch of the original house, if the extension is more than one storey

If your house is on designated land, you will need to apply for planning permission for side extensions and two storey rear extensions

* Designated land includes Areas of Outstanding Natural Beauty and conservation areas.

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