Fixed fee from £1,575. MCIAT chartered. Camden planning experienced. 1 postcode covered: N6.
Highgate is village character on the hill, Georgian and Victorian. The dominant stock — georgian villas, victorian and edwardian semis — 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 Highgate 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 georgian villas, victorian and edwardian semis (typical of Highgate), 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.
Highgate is characterised by georgian villas, victorian and edwardian semis. 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).