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Householder Prior Notification for Single Storey Rear Extensions

Under permitted development legislation, householders are able to build larger single-storey rear extensions in certain circumstances. This is defined as extending beyond the rear wall of the original house by:

  • over four and up to eight metres for detached houses; and
  • over three and up to six metres for all other houses

The following conditions apply:

  • The proposed extension must not include any extension to the side of any part of the original house.
  • The extension must not exceed 4 metres in height.
  • If the extension is within 2 metres of the boundary of the house, the eaves must not be more than 3 metres in height
  • The property must not be located in a Conservation Area or a Site of Special Scientific Interest.
  • Not more than 50% of the curtilage (the land not including the original house) must be covered by buildings.
  • The height of the extension must not be higher than the highest point of the roof of the original house. 
  • The height of the eaves of the extension must not be higher than the eaves of the original house.
  • The extension must not include a balcony, veranda or raised platform/decking that is over 30cm in height. 
  • Permitted development rights must not have been removed when the house was first built.
  • Extensions must be built from materials that are similar in appearance to those used for the exterior of the main house (except for a conservatory).

If you wish to build an extension of this size, you must apply to the Council for prior approval a larger single storey rear extension before starting work. The application must include:

  1. A written description of the proposal which includes the length the extension extends beyond the rear wall of the original house, the height at the highest point of the extension and the height to the eaves; 
  2. A plan of the site, showing the proposed development and any existing enlargement of the original house that the extension will join to.
  3. The addresses of all adjoining properties at the side, front and rear even if they are not physically 'attached'
  4. A contact address for the applicant (householder) 
  5. An email address if the householder is happy to receive correspondence by email.

The fee for this process is £96.

Application form 

Apply for a larger house extension online