Rear Dormer Loft Conversion Drawings in Balham (SW12)

Which postcode districts around SW12 do we cover for rear dormer work?

Every SW12 postcode district we draw in, the stock that dominates it and the authority that validates a rear dormer there. SW12 fees below are the statutory England rates for 2026, not rear dormer estimates.

How does a rear dormer differ street by street across SW12?

Roof pitch, wall build-up and plot depth change every few SW12 streets, and each one changes what a rear dormer can achieve at that address.

• Inside SW12: Balham (SW12) — a rear dormer in Balham starts from victorian and edwardian terraces, and Balham reads as Victorian and Edwardian terraces. Full-width rear dormers on Victorian terraces here are the default in SW12. Wandsworth Council assesses Balham rear dormers against its own Balham character guidance, and the location plan we draw for Balham references Balham High Road.
• Inside SW12: Nightingale Triangle (SW12) — Edwardian conservation area defines Nightingale Triangle, where edwardian terraces and villas set what a rear dormer can do. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses across SW12. Any Nightingale Triangle rear dormer is validated by Wandsworth Council, with Nightingale Lane the usual Nightingale Triangle reference point on the site plan.
• Bordering SW12: Clapham Junction (SW11) — Victorian terraces, transport hub defines Clapham Junction, where victorian terraces, mansion blocks set what a rear dormer can do. Full-width rear dormers on Victorian terraces here are the default across SW11. Any Clapham Junction rear dormer is validated by Wandsworth Council, with Clapham Junction station the usual Clapham Junction reference point on the site plan.
• Bordering SW12: Battersea (SW8, SW11) — a rear dormer in Battersea starts from victorian terraces, new-build apartments, and Battersea reads as Victorian terraces, riverside regen at Power Station. Full-width rear dormers on Victorian terraces here are the default in SW8. Wandsworth Council assesses Battersea rear dormers against its own Battersea character guidance, and the location plan we draw for Battersea references Battersea Power Station.
• Bordering SW12: Tooting (SW17) — rear dormer work in Tooting means edwardian terraces. Tooting is Edwardian terraces, vibrant high street. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses throughout SW17. Wandsworth Council decides the Tooting application, and Tooting Market anchors the Tooting location plan.
• Bordering SW12: Wandsworth Common (SW17, SW18) — a rear dormer in Wandsworth Common starts from victorian villas and terraces, and Wandsworth Common reads as Victorian villas around the common. Full-width rear dormers on Victorian terraces here are the default in SW17. Wandsworth Council assesses Wandsworth Common rear dormers against its own Wandsworth Common character guidance, and the location plan we draw for Wandsworth Common references Wandsworth Common.
• Bordering SW12: Earlsfield (SW18) — a rear dormer in Earlsfield starts from victorian terraces, and Earlsfield reads as Victorian terraced streets. Full-width rear dormers on Victorian terraces here are the default in SW18. Wandsworth Council assesses Earlsfield rear dormers against its own Earlsfield character guidance, and the location plan we draw for Earlsfield references Earlsfield station.
• Bordering SW12: Putney (SW15) — rear dormer work in Putney means edwardian terraces, victorian villas, mansion blocks. Putney is Edwardian terraces, riverside. Full-width rear dormers on Victorian terraces here are the default throughout SW15. Wandsworth Council decides the Putney application, and Putney Bridge anchors the Putney location plan.
• Bordering SW12: Southfields (SW18) — a rear dormer in Southfields starts from 1930s semi-detached, edwardian terraces, and Southfields reads as 1930s semi-detached, grid plan. The deeper Edwardian rear slope takes a full-width dormer without breaching the 40 m³ or 50 m³ volume limits on most of these houses in SW18. Wandsworth Council assesses Southfields rear dormers against its own Southfields character guidance, and the location plan we draw for Southfields references Southfields station.
• Bordering SW12: Tonsleys (SW18) — rear dormer work in Tonsleys means victorian terraces. Tonsleys is Victorian conservation area. Full-width rear dormers on Victorian terraces here are the default throughout SW18. Wandsworth Council decides the Tonsleys application, and Tonsley Hill anchors the Tonsleys location plan.

How do conservation areas and Article 4 affect a rear dormer in SW12?

Conservation areas covering SW12 (Balham): Wandsworth Council runs 45, and Tonsley, Magdalen Park, Nightingale Triangle are the ones SW12 (Balham) owners meet most. A rear dormer inside a SW12 (Balham) conservation area loses permitted development, so the SW12 (Balham) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Magdalen Park a rear dormer is judged on the street elevation first.

Article 4 and your SW12 (Balham) rear dormer: Article 4 for HMO conversions covering the whole borough. At a SW12 address that matters twice over, because Wandsworth Council applies the direction unevenly across SW12 (Balham) — we read the SW12 (Balham) policies map for the exact SW12 address before quoting rear dormers.

The building fabric around SW12 (Balham): 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. A rear dormer in SW12 (Balham) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Wandsworth Council.

Conservation areas covering SW12 (Balham): Lambeth Council runs 64, and Kennington, Brockwell Park, Streatham Hill are the ones SW12 (Balham) owners meet most. A rear dormer inside a SW12 (Balham) conservation area loses permitted development, so the SW12 (Balham) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Kennington a rear dormer is judged on the street elevation first.

Article 4 and your SW12 (Balham) rear dormer: Borough-wide Article 4 for HMO conversions; plus office-to-residential restrictions. At a SW12 address that matters twice over, because Lambeth Council applies the direction unevenly across SW12 (Balham) — we read the SW12 (Balham) policies map for the exact SW12 address before quoting rear dormers.

The building fabric around SW12 (Balham): Victorian terraces in Clapham, Brixton, Herne Hill; Edwardian villas; 1930s and post-war estates in parts of Streatham; Georgian in Kennington. Mix of dense Victorian residential and post-war estate; strong conservation area coverage; generally design-led planning decisions. A rear dormer in SW12 (Balham) is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Lambeth Council.

Who decides a rear dormer on the edge of SW12?

• Hammersmith and Fulham — adjoining SW12 (Balham), with 45 conservation areas centred on W6. A rear dormer on the far side of the SW12 (Balham) line is determined by Hammersmith & Fulham Council, so the SW12 (Balham) quote for rear dormers is checked against Hammersmith and Fulham guidance before it is issued.
• Westminster — adjoining SW12 (Balham), with 56 conservation areas centred on SW1. A rear dormer on the far side of the SW12 (Balham) line is determined by Westminster City Council, so the SW12 (Balham) quote for rear dormers is checked against Westminster guidance before it is issued.
• Lambeth — cross the SW12 (Balham) boundary and Lambeth Council takes the rear dormer instead, applying 64 conservation areas of its own around SE1. We re-price rear dormers at the SW12 (Balham) edge because Lambeth policy and Wandsworth policy rarely align on rear dormer depth.
• Merton — the Merton boundary runs against Wandsworth, so a rear dormer a street from SW12 (Balham) is decided by Merton Council instead. Merton runs 28 conservation areas across SW16 and its neighbours, which is why rear dormers priced for SW12 (Balham) are re-checked against Merton policy whenever the SW12 (Balham) address sits on that edge.
• Croydon — cross the SW12 (Balham) boundary and Croydon Council takes the rear dormer instead, applying 24 conservation areas of its own around CR0. We re-price rear dormers at the SW12 (Balham) edge because Croydon policy and Lambeth policy rarely align on rear dormer depth.
• Southwark — adjoining SW12 (Balham), with 43 conservation areas centred on SE1. A rear dormer on the far side of the SW12 (Balham) line is determined by Southwark Council, so the SW12 (Balham) quote for rear dormers is checked against Southwark guidance before it is issued.

Sources for this SW12 rear dormer 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.