Design & build
more space, less stress.

Many loft conversions, rear extensions and garden rooms fall under permitted development and don't need a full planning application — we confirm this with a Lawful Development Certificate for certainty. Larger or wrap-around extensions, and homes in conservation areas or under Article 4 directions, need a householder planning application, which our in-house team prepares and submits for you.

As an indicative guide, single-storey rear extensions typically start from around £40,000 + VAT and loft conversions from around £52,000, rising to roughly £105,000 for a large mansard or wrap-around. Full refurbishments are about £35,000 per floor. Final cost depends on size, specification and site conditions — use our visual builder above for an instant estimate.

Design and build means one accountable team carries your project through every stage — concept design, planning, architecture, interior design, structural engineering, Building Control approvals and construction — with no hand-offs or blame between architect and builder.

Design and approvals usually take 6–10 weeks, and most loft conversions and extensions are then on site for around 10–20 weeks depending on size and complexity. We give you a clear programme before any work begins.

We are based in Walthamstow, East London and design and build homes across London and the South East, including Wandsworth, Richmond, Ealing, Haringey, Hackney, Islington and the surrounding boroughs.