Householders are able to build larger single-storey rear extensions under permitted development, subject to limitations, conditions and land designations (outside a conservation area and not within a site of special scientific interest). The size limits double from 4 metres to 8 metres in length for detached houses, and from 3 metres to 6 metres for all other houses. However, these new larger extensions must go through a prior notification application with the local planning authority. There are more guidance notes available on the Planning Portal.
The prior notification process will involve the local planning authority, on receipt of all necessary information, notifying the owners/occupiers of any adjoining property. Where an adjoining owner or occupier objects, the prior approval of the local planning authority is required as to the impact of the development on the amenity of any adjoining property. When considering the impact, the local planning authority will take into account any representations received.
No development can begin before the occurrence of one of the following:
The development must be carried out in accordance with the details approved (where prior approval is required), or in accordance with the details provided with the notification (unless the local planning authority and the developer agreed otherwise).
Applicants are advised any of these larger extensions (as defined above), are still required to accord with all other relevant limitations and conditions, as set out in Class A, Part 1 Schedule 2 of The Town and Country Planning (General Permitted Development) Order 2015. The local planning authority can refuse an application where, in the opinion of the authority, the development does not comply with the conditions, limitations and restrictions of Class A.
Notification of a ‘larger extension’ within the curtilage of a dwelling house The Town and Country Planning (General Permitted Development) Order 2015 (As Amended) Class A, Part 1, Schedule 2.
Before beginning the development, the applicant/developer shall provide the following information to the local planning authority.
It is important to note that if an objection is received, the local planning authority is required to consider the impact of the development on the amenity of all adjoining premises. If the local planning authority considers the information submitted is insufficient to assess this impact, they may ask for more information, or they may refuse prior approval on the basis that the information submitted fails to demonstrate that the impact would be acceptable.
To reduce the likeliness of the latter, it is recommended you submit the following information at this initial notification stage:
The full postal address of all adjoining properties. Enter the:
Updated: 29 July 2019