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  Home Extensions planning permission

From 1 October 2008 an extension or addition to your home will be considered to be permitted development, not requiring an application for Full planning permission, (It is recommended that you gain a Certificate of Lawfulness to prove that your project conforms to the conditions set out below. contact us for further information). subject to the limits and conditions set out below:

Permitted development For extensions

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.

Maximum depth of a single-storey rear extension of three metres for an attached house and four metres for a detached house.

Maximum height of a single-storey rear extension of four metres.

Maximum depth of a rear extension of more than one storey of three metres including ground floor.

Maximum eaves height of an extension within two metres of the boundary of three metres.

Maximum eaves and ridge height of extension no higher than existing house.

Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.

Two-storey extensions no closer than seven metres to rear boundary.

Roof pitch of extensions higher than one storey to match existing house.

Materials to be similar in appearance to the existing house.

No verandas, balconies or raised platforms.

Upper-floor, side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor.

On designated land* no permitted development for rear extensions of more than one storey.

On designated* land no cladding of the exterior.

On designated* land no side extensions.


Building regulations will still apply

bespoke extension

building control services

We provide full building control services for your home extension that is required to demonstrate design and safety compliance More..

Our Typical Building control services
Structural timber/steel calculations.
Sap calculations
Section details
Material lists and costs



This booklet provides an introduction to the Building Regulations in England and Wales and is intended for anyone proposing to carry out building projects. It is not a statement of the law but is intended to help you to understand the system.



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Useful planning tools

the planning portal website provide up to the minuet planning information they have developed an interactive tool to allow you to establish what type of permission you may require just click on the image below.



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