A well-executed kitchen extension or loft conversion typically adds meaningful value, particularly where it adds a genuine extra bedroom or significantly improves how a house functions day to day — but the return varies a lot by area and by how the extension compares to similar houses nearby.
Over-extending relative to your street — a large extension on a house that’s already at the top of the local price range — tends to add less value proportionally than the same work on a more modest house.
If added value is a genuine priority alongside living in the space, it’s worth discussing local comparables before finalising scope, rather than after the work is done.
