{"id":7533,"date":"2026-09-01T08:33:38","date_gmt":"2026-09-01T08:33:38","guid":{"rendered":"https:\/\/www.buildteam.com\/blog\/?p=7533"},"modified":"2026-09-01T08:33:40","modified_gmt":"2026-09-01T08:33:40","slug":"conservation-area-extension","status":"publish","type":"post","link":"https:\/\/www.buildteam.com\/blog\/conservation-area-extension\/","title":{"rendered":"Extending a House in a Conservation Area: A London Homeowner’s Guide"},"content":{"rendered":"
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You can almost always still extend a house in a conservation area, but conservation status removes most permitted development rights, so nearly every rear extension, side return, dormer or mansard needs full planning permission. An Article 4 direction can remove even more rights. The keys to approval are matching materials, keeping additions to the rear, and respecting the roof line and the character of the street.<\/p>\n<\/div>\n

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London is full of conservation areas. There are more than a thousand across the capital, and in some boroughs they cover half the housing stock or more. If you own a period terrace in London, there is a real chance your home sits in one, and that changes what you can build.<\/p>\n

Conservation area status does not stop you extending. It does mean the automatic permitted development rights most homeowners rely on are largely removed, so you usually need a full planning application, and the design is judged more closely. This guide explains exactly what changes, how to check your property, and how to get an extension or loft approved, with a real example from one of our projects in a Lambeth conservation area.<\/p>\n

What is a conservation area?<\/h2>\n

A conservation area is an area of special architectural or historic interest, designated by the local council under the Planning (Listed Buildings and Conservation Areas) Act 1990. The council has a legal duty to preserve or enhance its character, and that duty shapes how every planning application in the area is decided.<\/p>\n

There were 9,907 conservation areas in England in 2024, and 32 per cent of them are in London and the South East, the highest of any region. This is very much a London homeowner’s issue. Being in a conservation area is not the same as living in a listed building: a listed building is individually protected, while a conservation area protects the wider character of a street or neighbourhood.<\/p>\n

What changes in a conservation area?<\/h2>\n

In planning terms, a conservation area is “designated land”. On designated land, the permitted development rules remove several rights that would otherwise let you build without a full application. The main changes for extensions and loft conversions are:<\/p>\n