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A guide to extensions in Conservation Areas

5 min read
Oct '25 • by Molly-Sue Moore

Quick summary

In Conservation Areas, most extensions require planning permission, especially if they go beyond 3 metres from the rear wall or involve double-storey builds, which are more challenging. Single-storey rear extensions under 3 metres often fall under permitted development, but costs can start from around £1,500 to £3,000 per sqm, VAT included. Always check local rules as they vary and consult experts for a smooth process.

Getting an extension is no mean feat at the best of times but when it comes to living in a Conservation Area the rules and regulations can be even more convoluted. Our planning experts at Resi are on-hand to demystify the cans and cants around extensions in Conservation Areas so you know what opportunities your property holds for that golden extra space.

What is a Conservation Area?

These are areas of architectural, natural or historical significance that are protected by certain restrictions to building and construction as a means of preserving or nourishing them. These can include woodlands, country estates and city suburbs.

Find out if you’re in a Conservation Area

There are a few ways to find out if your property is in a Conservation Area. First off, you can get in touch with our experienced planning team by booking a free advice call. They can offer first-hand guidance and advice if you’re looking to build an extension in one of these areas.

Another option is to find out who your local council is and contact them directly. The same goes for your local planning authority.

How much does an architect charge?