Pre-set example. Adjust the size below to recalculate.
Estimate uses Wandsworth Council build-cost premium and typical single mansard ranges for Wandsworth.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.



Every Wandsworth postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof cost single there. Wandsworth fees below are the statutory England rates for 2026, not mansard roof cost single estimates.
| Postcode | Area | Dominant stock | What it means for a mansard roof cost single |
|---|---|---|---|
| SW16 | Streatham / Norbury | Edwardian terraces, post-war flats | Streatham / Norbury is split at SW16. Either Lambeth Council or Wandsworth Council or Merton Council or Croydon Council can determine a mansard roof cost single here, so the SW16 address is checked against both policies maps first. |
| SW19 | Wimbledon / Colliers Wood | Victorian villas, Edwardian terraces | SW19 straddles a boundary: Wimbledon / Colliers Wood addresses fall to Merton Council or Wandsworth Council, so confirm which authority validates the mansard roof cost single before submitting SW19 drawings. |
| SW11 | Battersea / Clapham Junction | Victorian terraces, mansion blocks | Battersea / Clapham Junction sits wholly inside SW11, so Wandsworth Council validates every mansard roof cost single submitted from an SW11 address. |
| SW12 | Balham | Victorian and Edwardian terraces | A mansard roof cost single in Balham may land with Wandsworth Council or Lambeth Council — SW12 crosses the boundary, and the SW12 policies map decides it street by street. |
| SW15 | Putney / Roehampton | Edwardian terraces, Victorian villas, mansion blocks | A mansard roof cost single at an SW15 address in Putney / Roehampton is determined by Wandsworth Council under its own Local Plan policies for Putney / Roehampton. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | A mansard roof cost single in Tooting / Earlsfield may land with Wandsworth Council or Merton Council — SW17 crosses the boundary, and the SW17 policies map decides it street by street. |
| SW18 | Wandsworth / Earlsfield / Southfields | Victorian villas and terraces | A mansard roof cost single at an SW18 address in Wandsworth / Earlsfield / Southfields is determined by Wandsworth Council under its own Local Plan policies for Wandsworth / Earlsfield / Southfields. |
| SW4 | Clapham | Victorian terraces, Edwardian villas | Clapham is split at SW4. Either Lambeth Council or Wandsworth Council can determine a mansard roof cost single here, so the SW4 address is checked against both policies maps first. |
Roof pitch, wall build-up and plot depth change every few Wandsworth streets, and each one changes what a mansard roof cost single can achieve at that address.
Conservation areas covering Wandsworth: Wandsworth Council runs 45, and Magdalen Park, Nightingale Triangle, Wandsworth Common are the ones Wandsworth owners meet most. A mansard roof cost single inside a Wandsworth conservation area loses permitted development, so the Wandsworth submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Magdalen Park a mansard roof cost single is judged on the street elevation first.
Article 4 and your Wandsworth mansard roof cost single: Article 4 for HMO conversions covering the whole borough. At a SW11 address that matters twice over, because Wandsworth Council applies the direction unevenly across Wandsworth — we read the Wandsworth policies map for the exact SW11 address before quoting mansard roof cost singles.
Wandsworth housing stock: Extensive Victorian terraced streets — the classic London side-return extension opportunity; Edwardian villas around the commons; 1930s semi-detached in Southfields. Family-oriented, high side-return extension and loft conversion rates; planning department experienced with Victorian terrace modifications. Read that before choosing a mansard roof cost single route in Wandsworth — construction, not postcode, sets what is achievable.
Sources for this Wandsworth mansard roof cost single page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.
