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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 exceed 3 metres from the rear wall or involve double-storey designs. Single-storey rear extensions under permitted development can cost around £1,600 to £3,200 for about 3-4 sqm, but larger or more complex projects often need detailed plans and approval, which can take time.

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?