Fixed fee from £1,575. MCIAT chartered. Islington planning experienced. 1 postcode covered: N1.
Canonbury is Georgian and Victorian conservation area. The dominant stock — georgian villas, victorian terraces — 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 Canonbury fall under Permitted Development if the property is a house (not a flat), not listed, and not in a conservation area. Islington has an Article 4 Direction — Article 4 Direction covering the whole borough removes permitted development rights for HMO conversions (C3 to C4). Separate Article 4 for office-to-residential in key 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 terraces (typical of Canonbury), 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 Islington Council planning decision. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination.
Canonbury is characterised by georgian villas, victorian terraces. We've delivered mansard roof extensions for every period represented here — the design choices vary significantly by stock.
Our first-time approval rate in Islington is 98%. Pre-application advice from Islington Council is built into our process when the case is borderline (conservation area, Article 4, listed).