Fixed fee from £1,575. MCIAT chartered. Southwark planning experienced. 1 postcode covered: SE1.
Borough is Georgian and Victorian terraces, market quarter. The dominant stock — georgian and victorian terraces, warehouse conversions — 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 Borough fall under Permitted Development if the property is a house (not a flat), not listed, and not in a conservation area. Southwark has an Article 4 Direction — Article 4 for HMOs borough-wide; additional Article 4 for office-to-residential in Bermondsey and Elephant & Castle. 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 and victorian terraces, warehouse conversions (typical of Borough), 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 Southwark Council planning decision. Site survey week 1, design weeks 2–3, validation 1–2 weeks, statutory 8-week determination.
Borough is characterised by georgian and victorian terraces, warehouse conversions. We've delivered mansard roof extensions for every period represented here — the design choices vary significantly by stock.
Our first-time approval rate in Southwark is 98%. Pre-application advice from Southwark Council is built into our process when the case is borderline (conservation area, Article 4, listed).