Homeowners are often pleased to hear that many loft conversions do not need a planning application. That is true in many cases, but it is not true for every home, so it is worth checking before you commit to a design.
What is permitted development?
Permitted development rights let you carry out certain kinds of work without applying for planning permission, provided the work stays within set limits. For loft conversions the limits usually cover things like the additional roof space you create, where the roof extension sits and the materials you use.
Things that usually matter
- The volume of extra roof space. The limits are lower for terraced houses than for semi-detached and detached houses.
- Where the extension is. Extensions to the roof slope that faces the road are usually not covered.
- The height. The extension generally cannot be higher than the highest part of the existing roof.
- Materials. They should be similar in appearance to the existing house.
- Balconies and raised platforms are not covered by permitted development.
- Side windows generally need to be obscure-glazed and fixed or opening only high up.
When you will probably need permission
- You live in a flat or maisonette, where these rights do not apply in the same way.
- Your property is in a conservation area or is a listed building.
- Permitted development rights have been removed, for example by an Article 4 direction or a condition on an earlier planning permission.
- Your design goes beyond the permitted development limits.
Building Regulations always apply
Even where planning permission is not needed, a loft conversion needs Building Regulations approval. This covers the strength of the structure, the staircase, fire safety, insulation and more. A party wall notice may also be needed if the work affects a wall you share with a neighbour.
Checking for certain
If you want certainty, you can apply to your council for a lawful development certificate, which confirms that the proposed work is lawful. Your designer or architect can also advise on your property.
This guide is general information for homes in England and is not legal or planning advice. Rules can change and differ between properties and local authorities, so always confirm the position with your council or a qualified professional.
If you are thinking about a loft conversion, you can ask us about your loft and we will explain the options for your property.