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House Extensions: 5 Things to Know Before You Start

Before you starting to build a side extension or a rear extension you should follow few important steps.

1. Inform the council

Even if the extension you are planning to build is within the permitted development you must inform the council of the proposed works via a prior approval application.

An extension or addition 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 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