Fixed fee from £1,575. MCIAT chartered. Wandsworth planning experienced. 1 postcode covered: SW12.
Balham is Victorian and Edwardian terraces. The dominant stock — victorian and edwardian 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 Balham fall under Permitted Development if the property is a house (not a flat), not listed, and not in a conservation area. Wandsworth has an Article 4 Direction — Article 4 for HMO conversions covering the whole borough. 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 victorian and edwardian terraces (typical of Balham), 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 Wandsworth Council planning decision. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination.
Balham is characterised by victorian and edwardian 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 Wandsworth is 98%. Pre-application advice from Wandsworth Council is built into our process when the case is borderline (conservation area, Article 4, listed).