Notification of a Larger Home Extension

Rear Extensions

Secondary legislation has come into force which introduces a prior notification scheme for rear extensions by altering Part A of the General Permitted Development Order (GPDO). It enabled for a period of three years, between 30th May 2016 and 30th May 2019, householders to build larger single-storey rear extensions under permitted development rights.

The size limits will be doubled from 4 metres to 8 metres for detached houses, and from 3 metres to 6 metres for all other houses with the extension no higher than 4 metres. All other limits and parameters as provided for by Part A of the GPDO remain in force.

This legislation introduces a new process, prior notification, which requires the homeowner who wishes to build a larger single storey extension to notify the local planning authority and provide details in relation to their proposal. This new process can be summarised as:

1. The homeowner wishing to build a larger rear extension completes the householder form, available on the right hand side of this page, and includes the following details:
  • a written description of the proposal which includes the length that the extension extends beyond the rear wall of the original house, the height at the eaves and the height at the highest point of the extension;
  • a plan of the site, showing the proposed development;
  • the addresses of any adjoining properties, including at the rear; and
  • a contact address for the homeowner and an e-mail address if the homeowner is happy to receive correspondence by e-mail.

There is no fee in connection with this process.

2. The local authority may ask for further information if it needs to make a decision about the impact of the development on the amenity of adjoining properties.

3. The local authority will serve a notice on adjoining owners or occupiers i.e. those who share a boundary, including to the rear. This will give the address of the proposed development and a description of the development. This notice will also detail the date on which the  42 day determination period ends and the end of the neighbour consultation period (minimum of 21 days).

4. If any adjoining neighbour raises an objection within the 21-day period, the local authority will take this into account and make a decision about whether the impact on the amenity of all adjoining properties is acceptable.

5. The development can go ahead if the local authority notifies the developer in writing either:

  • that as no objections were received from adjoining neighbours it has not been necessary to consider the impact on amenity, or
  • that following consideration, it has been decided that the effect on the amenity of adjoining properties is acceptable.

6. If the local authority does not notify the developer of its decision within the 42-day determination period, the development may go ahead. If the application is refused the homeowner may make an appeal to the Planning Inspectorate.

It should be noted that to benefit from these permitted development rights, the extension must be completed on or before the 30th May 2019 and the developer must notify the local authority in writing of the date of completion.