Internal alterations by area
Use this hub to open the district-specific guide for internal alterations. The area pages cover local borough context, likely approvals, cost signals and the exact-address check needed before you rely on permitted development or any consent route.
Related guidance
Two separate approval systems. Confusing them is the most common — and most expensive — mistake in domestic building.
Open guideBuilding regulations are a separate system from planning — and the certificate at the end is the one your buyer's solicitor will ask for.
Open guideAlmost every London extension, loft and basement engages this Act. Here's how it actually works.
Open guideInternal alterations in served areas
First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →First check: A structural engineer's check on whether the wall is load-bearing
Service guide →