Fixed fee from £1,575. MCIAT chartered. Richmond upon Thames planning experienced. 2 postcodes covered: TW1, TW2.
Twickenham is Georgian and Victorian riverside town. The dominant stock — georgian fragments, victorian terraces, edwardian 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 Twickenham fall under Permitted Development if the property is a house (not a flat), not listed, and not in a conservation area. Richmond upon Thames has no borough-wide Article 4 Direction. 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 fragments, victorian terraces, edwardian villas (typical of Twickenham), 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 Richmond Council planning decision. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination.
Twickenham is characterised by georgian fragments, victorian terraces, edwardian 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 Richmond upon Thames is 98%. Pre-application advice from Richmond Council is built into our process when the case is borderline (conservation area, Article 4, listed).