Permitted Development Extensions
Unsure whether your extension qualifies? Get a quick permitted development check for your property.
What is a permitted development extension?
A permitted development extension is a home extension that can be built without submitting a full planning application, as long as it meets specific size, height, and design limits set out in UK planning rules. These rights apply to many houses, but they are subject to strict conditions depending on the type of property and its location.
For example, limits apply to how far the extension can project from the rear wall, how high it can be, and how close it can be to boundaries. Properties in conservation areas, flats, listed buildings, or homes where permitted development rights have been removed may require full planning permission instead.
Because the rules are technical and vary depending on the property, many homeowners seek professional advice before starting work to ensure their extension qualifies and avoids enforcement issues later.
When Do You Need Planning Permission Instead?
In some situations, a full planning application is still required even if an extension appears to fall within permitted development limits. This may apply if your property is:
- A flat or maisonette
- A listed building
- Located in a conservation area
- Subject to an Article 4 Direction
- Previously extended beyond permitted limits
It is also common for homeowners to apply for a Lawful Development Certificate to obtain formal confirmation from the local authority that the extension complies with permitted development rules. This provides reassurance when selling the property in the future.