How much will it cost and how long will it take?

Turn wasted outdoor space into a flexible living area with a side-return extension

A simple side extension will cost from £20,000. Extra internal work, such as adding a new kitchen, and the style of the extension – for example adding glazed external doors – will affect the final figure.

Plan for at least eight to ten weeks for the structural work, plus more for decorating the interior of the new space.

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