Fixed fee from £1,575. MCIAT chartered. Camden planning experienced. 1 postcode covered: NW6.
West Hampstead is Victorian and Edwardian villa streets. The dominant stock — edwardian mansion blocks, victorian villas — has specific constraints and opportunities for mansard roof extensions. Side returns sit better on bay-fronted Victorian terraces than on detached 1930s semis. Mansards work where the existing roofscape supports them. We design to the block, not the brochure.
Local context summary — Architectural Drawings London, MCIAT charteredMost mansard roof extensions projects in West Hampstead fall under Permitted Development if the property is a house (not a flat), not listed, and not in a conservation area. Camden has an Article 4 Direction — Article 4 removes permitted development for HMO conversions (C3 to C4) across the borough, plus restrictions on basement extensions in 12 conservation areas. We confirm eligibility free at the site survey.
Drawings: fixed fee from £1,575 (Mansard Roof Extensions). Construction cost is separate and depends on size, finish and structural complexity. For edwardian mansion blocks, victorian villas (typical of West Hampstead), expect £45,000–£85,000 build cost for a standard rear extension or loft, more for mansards or basements.
12–14 weeks from first call to Camden Council planning decision. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination.
West Hampstead is characterised by edwardian mansion blocks, victorian villas. We've delivered mansard roof extensions for every period represented here — the design choices vary significantly by stock.
Our first-time approval rate in Camden is 98%. Pre-application advice from Camden Council is built into our process when the case is borderline (conservation area, Article 4, listed).
Same-day fixed quote. MCIAT chartered.
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