House Extensions in Hampstead

Extensions on Hampstead's specific housing stock

Hampstead is overwhelmingly Victorian and Edwardian terraces and semis, much of it within the Hampstead Conservation Area — which means extension design here has to account for sightlines from the street, matching brick and roofline, and Camden's specific expectations for what's approvable under Permitted Development versus what needs a full planning application.

We've been based in Hampstead, not just working here occasionally, for twenty years. That means we know which streets sit inside the conservation boundary, which planning officers are reviewing applications, and what's realistically going to get approved before you spend money on drawings that won't pass.

Extension types we build most in Hampstead

• Side-return extensions on Victorian terraces — the most common Hampstead extension
• Single-storey rear extensions with bifold or crittall-style openings onto the garden
• Double-storey rear extensions where garden depth allows
• Basement and lower-ground extensions on properties with existing cellars

Planning permission in Hampstead specifically

Because so much of Hampstead sits within Camden's conservation area, permitted development rights are more restricted here than in a standard residential street elsewhere in London. Second-storey extensions and anything altering the street-facing elevation typically require full planning permission. We'll assess this honestly for your specific property and street at the free site visit, before any design work begins.

Local questions we get asked most

Most of central Hampstead is, but boundaries vary street by street. We'll confirm this for your specific address at the site visit — it's one of the first things we check.

Typically 8–12 weeks once work starts, though conservation area planning approval can add several weeks to the timeline before building even begins.

Yes — our coverage includes both the Hampstead Village side and the areas toward Highgate and Kenwood.