Can I extend my house in BR3?

Where character is protected

Beckenham town centre is a conservation area. Many of the residential roads around it are not. In a conservation area, permitted development rights for some alterations are reduced, and the design test is stricter. Outside it, a modest rear extension is often a normal householder application.

BR3 is not a blanket Green Belt district. The useful check is the specific postcode, plus whether the house is in a row where the gap between buildings is part of the character. Bromley’s side-space policy is aimed at that.