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Home Extensions FAQ

The cost of a single storey extension will depend on the scale of your project and where abouts you live in the country. A basic extension would typically cost around £1,000 per square metre meaning a 3 x 5 metre single storey extension, for example, would set you back £15,000.

Extension. Adding square footage is pretty much guaranteed to boost value, whether it’s adding a kitchen or dining area with a single-storey extension, which usually doesn’t require planning permission, or a double extension for extra bedrooms.

Double storey extensions can extend up to three metres out from the original house. Must be no closer than seven metres to the rear boundary. Upper-floor, side-facing windows to be obscure-glazed; any opening to be 1.7m above the floor.

No extension to be higher than the highest part of the roof. Single-storey rear extension must not extend beyond the rear wall of the original house by more than three metres if an attached house or by four metres if a detached house.

The average cost per m2 for an extension outside of London is between £1,200-£1,500. In London and the South East, the average cost per m2 is around £1,500-£2,000+. For two-storey extensions, add 50% to the cost of a single-storey extension. If you want to add a bathroom or kitchen, add £5,000-£10,000.

Borrowing Tips
Arrange funding first. Approach lenders before you start looking for a renovation as arranging finance can take weeks.
Shop around. Approach several lenders to find the one that offers the best deal.
Keep your own funds available.
Use credit facilities.
Add a contingency.

You don’t need to apply for planning permission if the extension meets certain rules.