Where in Wimbledon does a mansard roof extension actually get determined?
Every Wimbledon postcode district we draw in, the stock that dominates
it and the authority that validates a mansard roof extension there. Wimbledon fees below are the
statutory England rates for 2026, not mansard roof extension estimates.
| Postcode | Area | Dominant stock | What it means for a mansard roof extension |
|---|
| SW19 | Wimbledon / Colliers Wood | Victorian villas, Edwardian terraces | Wimbledon / Colliers Wood is split at SW19. Either Merton Council or Wandsworth Council can determine a mansard roof extension here, so the SW19 address is checked against both policies maps first. |
| SW20 | Raynes Park | Victorian villas, Edwardian terraces | Raynes Park sits wholly inside SW20, so Merton Council validates every mansard roof extension submitted from an SW20 address. |
| SW19 | Wimbledon Village | Georgian and Victorian villas | Neighbouring Wimbledon Village, where mansard roof extension work is handled by the same Merton Council case officers. |
| SM4 | Morden | 1930s semi-detached, post-war flats | Neighbouring Morden, where mansard roof extension work is handled by the same Merton Council case officers. |
| CR4 | Mitcham | 1930s semi-detached, post-war estates | Neighbouring Mitcham, where mansard roof extension work is handled by the same Merton Council case officers. |
| SW19 | Colliers Wood | Edwardian terraces, post-war flats | Neighbouring Colliers Wood, where mansard roof extension work is handled by the same Merton Council case officers. |
| SW19 | South Wimbledon | Edwardian terraces | Neighbouring South Wimbledon, where mansard roof extension work is handled by the same Merton Council case officers. |
Which Wimbledon neighbourhoods suit a mansard roof extension best?
Roof pitch, wall build-up and plot depth change every few Wimbledon
streets, and each one changes what a mansard roof extension can achieve at that address.
- Wimbledon (SW19, SW20) — Victorian villas, Edwardian terraces defines Wimbledon, where victorian villas, edwardian terraces set what a mansard roof extension can do. A mansard on a Victorian terrace almost always needs full planning permission across SW19. Any Wimbledon mansard roof extension is validated by Merton Council, with All England Club the usual Wimbledon reference point on the site plan.
- Near Wimbledon: Wimbledon Village (SW19) — Georgian and Victorian village conservation defines Wimbledon Village, where georgian and victorian villas set what a mansard roof extension can do. Mansards read as original on Georgian terraces across SW19. Any Wimbledon Village mansard roof extension is validated by Merton Council, with Wimbledon Village High Street the usual Wimbledon Village reference point on the site plan.
- Near Wimbledon: Raynes Park (SW20) — a mansard roof extension in Raynes Park starts from 1930s semi-detached, edwardian terraces, and Raynes Park reads as 1930s semi-detached, Edwardian terraces. Edwardian parapets give a mansard a clean base line in SW20. Merton Council assesses Raynes Park mansard roof extensions against its own Raynes Park character guidance, and the location plan we draw for Raynes Park references Raynes Park station.
- Near Wimbledon: Morden (SM4) — a mansard roof extension in Morden starts from 1930s semi-detached, post-war flats, and Morden reads as 1930s semi-detached, post-war flats. Mansards are rare on 1930s stock — the hipped roof form works against the geometry in SM4. Merton Council assesses Morden mansard roof extensions against its own Morden character guidance, and the location plan we draw for Morden references Morden Tube.
- Near Wimbledon: Mitcham (CR4) — a mansard roof extension in Mitcham starts from 1930s semi-detached, post-war estates, and Mitcham reads as 1930s semi-detached, post-war estates. Mansards are rare on 1930s stock — the hipped roof form works against the geometry in CR4. Merton Council assesses Mitcham mansard roof extensions against its own Mitcham character guidance, and the location plan we draw for Mitcham references Mitcham Cricket Green.
- Near Wimbledon: Colliers Wood (SW19) — Edwardian terraces, post-war flats defines Colliers Wood, where edwardian terraces, post-war flats set what a mansard roof extension can do. Edwardian parapets give a mansard a clean base line across SW19. Any Colliers Wood mansard roof extension is validated by Merton Council, with Colliers Wood Tube the usual Colliers Wood reference point on the site plan.
- Near Wimbledon: South Wimbledon (SW19) — a mansard roof extension in South Wimbledon starts from edwardian terraces, and South Wimbledon reads as Edwardian terraces. Edwardian parapets give a mansard a clean base line in SW19. Merton Council assesses South Wimbledon mansard roof extensions against its own South Wimbledon character guidance, and the location plan we draw for South Wimbledon references South Wimbledon Tube.
Does Wimbledon planning policy restrict a mansard roof extension?
Conservation areas covering Wimbledon: Merton Council runs 28, and Mitcham Cricket Green, Wimbledon Common, Wimbledon Village are the ones Wimbledon owners meet most. A mansard roof extension inside a Wimbledon conservation area loses permitted development, so the Wimbledon submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Wimbledon Common a mansard roof extension is judged on the street elevation first.
Article 4 and your Wimbledon mansard roof extension: Merton Council has made no borough-wide direction, so permitted development for a mansard roof extension in Wimbledon generally survives outside Wimbledon conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a SW19 owner records that a mansard roof extension was lawful.
Wimbledon housing stock: Victorian villas in Wimbledon; Edwardian terraces in Tooting and Colliers Wood; 1930s semi-detached in Morden and Raynes Park; post-war flats in Mitcham. Wimbledon is heavily conservation-controlled; outer Merton (Morden, Mitcham) is permissive. Read that before choosing a mansard roof extension route in Wimbledon — construction, not postcode, sets what is achievable. Merton Council charges £548 for a householder application and has 8 weeks to determine it.
What happens if a Wimbledon property sits on a boundary?
- Lambeth — the Lambeth boundary runs against Merton, so a mansard roof extension a street from Wimbledon is decided by Lambeth Council instead. Lambeth runs 64 conservation areas across SE1 and its neighbours, which is why mansard roof extensions priced for Wimbledon are re-checked against Lambeth policy whenever the Wimbledon address sits on that edge.
- Croydon — the Croydon boundary runs against Merton, so a mansard roof extension a street from Wimbledon is decided by Croydon Council instead. Croydon runs 24 conservation areas across CR0 and its neighbours, which is why mansard roof extensions priced for Wimbledon are re-checked against Croydon policy whenever the Wimbledon address sits on that edge.
- Sutton — adjoining Wimbledon, with 17 conservation areas centred on SM1. A mansard roof extension on the far side of the Wimbledon line is determined by Sutton Council, so the Wimbledon quote for mansard roof extensions is checked against Sutton guidance before it is issued.
- Kingston upon Thames — the Kingston upon Thames boundary runs against Merton, so a mansard roof extension a street from Wimbledon is decided by Kingston Council instead. Kingston upon Thames runs 22 conservation areas across KT1 and its neighbours, which is why mansard roof extensions priced for Wimbledon are re-checked against Kingston upon Thames policy whenever the Wimbledon address sits on that edge.
Sources for this Wimbledon mansard roof extension 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.
