The Clapham Catch: Two Councils, One Postcode, and What It Means for Your Extension
Clapham has a quirk almost nobody mentions until it matters. The same postcode, SW4, is split between two different councils. Your house might be judged by Lambeth. Your neighbour across the common might answer to Wandsworth. And the two don't always agree. That one fact can change your extension's rules, its timeline, even what you're allowed to build. So before anything else in Clapham, you need to know which council is yours. If you're talking to clapham architects , this is the first thing worth pinning down. Why Clapham is split in the first place Clapham grew up straddling a boundary. Most of it sits in the London Borough of Lambeth, but the western side, around Clapham Common and towards Clapham Junction, falls into Wandsworth. For most of daily life that makes no difference. For planning, it makes a real one. The two boroughs run separate Local Plans, separate conservation area maps, and separate pre-application services, and they genuinely reach differen...