Mansard Roof Extensions · SW19 Wimbledon
Fixed-fee mansard roof extensions for Wimbledon, Wimbledon Village, South Wimbledon, Colliers Wood in the SW19 postcode, drawn by an MCIAT-chartered architectural technologist and submitted to Merton Council. Merton controls the Wimbledon Village and Common conservation areas, where the large villas are tightly protected; the lower streets are a strong extension market.
MCIAT chartered drawings for planning, building regs, lofts and extensions — fixed fees 30% below typical London architects. Tell us what you need and we’ll reply the same working day.
A mansard roof extension adds a full storey behind a new sloping front face — a strong option on SW19's terraces in Wimbledon where a standard dormer is too small. Merton Council scrutinises mansards on townscape and precedent, especially within Wimbledon Village, Wimbledon West Side Common, Wimbledon Park; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
Wimbledon's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Wimbledon conservation areas — with heritage statements and planning officer negotiation built in.
Across Wimbledon, Wimbledon Village, South Wimbledon, Colliers Wood in SW19, the dominant property is large victorian and edwardian villas around wimbledon village and the common, with terraces and inter-war semis toward colliers wood and south wimbledon. That stock shapes what mansard roof extensions looks like here: the right approach for a period terrace differs from a mansion-block flat or a new-build, and Merton Council judges each on design quality and neighbour impact. We survey the specific Wimbledon property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the SW19 streetscape.
Housing stock in SW19: Large Victorian and Edwardian villas around Wimbledon Village and the Common, with terraces and inter-war semis toward Colliers Wood and South Wimbledon.
Within the district: Wimbledon, Wimbledon Village, South Wimbledon, Colliers Wood.
Streets we know in SW19: the Wimbledon Village roads (Church Road, Lingfield Road), the Wimbledon Park streets and Merton High Street. Each road has its own building line, boundary treatment and precedent that Merton Council weighs when assessing a mansard roof extensions scheme.
Conservation areas: Wimbledon Village, Wimbledon West Side Common, Wimbledon Park. Inside these, most external work needs full planning and a Heritage Statement.
Getting around SW19: Wimbledon on the District line, Thameslink and tram, plus Colliers Wood and South Wimbledon on the Northern line.
Regeneration: Wimbledon falls within or beside the Colliers Wood / South Wimbledon and the Wimbledon town-centre plan, which shapes local planning policy and design expectations.
Property values: around £500,000 for a flat and £1m-£2.5m for a house — a useful gauge of the build value an extension or loft adds in SW19.
Borough character: Wimbledon is heavily conservation-controlled; outer Merton (Morden, Mitcham) is permissive.
We check against Merton Council's mansard design guide and design to match the terrace.
Required for Wimbledon's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Merton Council committee.
Mansards invariably trigger Party Wall notices in Wimbledon's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Merton Council planning officer, committee representation if called in.
Part L thermal, Part B fire (critical on mansards), Part E acoustic separation.
Single planning or building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
Strongly. The Wimbledon Village and West Side Common conservation areas, with many large villas, mean full planning with a Heritage Statement for external changes, and Merton scrutinises materials, boundaries and roofscape closely. We design to that standard for Village addresses, and to lighter Permitted Development routes on the lower streets.
Yes. The terraces and inter-war semis toward Colliers Wood and South Wimbledon suit rear, side and loft extensions, much of it within Permitted Development outside the conservation areas, confirmed with a Lawful Development Certificate. We confirm the route and draw to Merton's checklist.
Some are. The large detached villas around the Village and Wimbledon Park have the plot and structure for a basement scheme, subject to Merton's policy and a structural and hydrology assessment. We draw the scheme and coordinate the engineer's calculations.
Values range widely — from around £1m near Colliers Wood to £2.5m in the Village — so on the family terraces and semis a side-return or loft adds floor area worth well above the build and drawing cost. Our fixed fee keeps the professional cost predictable wherever in SW19 you are.
Our fixed fee for mansard roof extensions in Wimbledon starts at £1,575 — no hourly billing. With Wimbledon property at around £500,000 for a flat and £1m-£2.5m for a house, the professional drawing fee is a small fraction of the value the work adds to SW19's large victorian and edwardian villas around wimbledon. Merton Council charges its own statutory application fee on top (currently £258 for a householder planning application, £578 for a full application). We quote the drawings as one fixed price and the free site survey covers every SW19 address.
For a SW19 project across Wimbledon, Wimbledon Village, South Wimbledon, Colliers Wood, expect roughly 3–4 weeks from instruction to submission: week 1 the measured survey, weeks 2–3 the drawings and your revisions, then validation and the statutory determination by Merton Council (8 weeks for a householder application). We carry the Wimbledon application through every officer query to the decision.
Wimbledon (SW19) sits primarily in Merton, so applications are decided by Merton Council. Article 4 in force in the borough: No. Conservation areas within SW19 include Wimbledon Village, Wimbledon West Side Common, Wimbledon Park, where full planning and a Heritage Statement are required. We confirm the planning route for your exact address before quoting.
Almost always. Any structural work behind mansard roof extensions in Wimbledon — new openings, steel beams, loft floors, foundations — needs Building Regulations approval covering structure (Part A), fire escape (Part B) and insulation (Part L), submitted to Merton Council Building Control or an approved inspector. On SW19's typically terraced and semi-detached stock, a Party Wall notice to adjoining neighbours is normally required before the steelwork. We coordinate both as part of the Complete package.
In value terms, yes. With Wimbledon (SW19) property at around £500,000 for a flat and £1m-£2.5m for a house, a well-designed extension or loft typically returns more than it costs in added floor area and sale value, while our fixed drawing fee from £1,575 keeps the professional cost predictable. The bigger risk is an unapproved or non-compliant scheme — which is why council-ready drawings and a clean Building Control sign-off matter on SW19 homes.
From £840.
From £840.
From £1,225.
From £1,225.
From £995.
From £1,950.
From £350.
From £540.
From £450.
From £1,225.
Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
Every SW19 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. SW19 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. |
| SW19 | Wimbledon | Victorian villas, Edwardian terraces | Wimbledon sits inside SW19; mansard roof extension proposals here are determined by Merton Council. |
| SW19 | Wimbledon Village | Georgian and Victorian villas | Wimbledon Village sits inside SW19; mansard roof extension proposals here are determined by Merton Council. |
| SW19 | Colliers Wood | Edwardian terraces, post-war flats | Colliers Wood sits inside SW19; mansard roof extension proposals here are determined by Merton Council. |
| SW19 | South Wimbledon | Edwardian terraces | South Wimbledon sits inside SW19; mansard roof extension proposals here are determined by Merton Council. |
| SW20 | Raynes Park | Victorian villas, Edwardian terraces | Adjoining district to SW19, also inside Merton for mansard roof extension purposes. |
| SM4 | Morden | 1930s semi-detached, post-war flats | Adjoining district to SW19, also inside Merton for mansard roof extension purposes. |
| CR4 | Mitcham | 1930s semi-detached, post-war estates | Adjoining district to SW19, also inside Merton for mansard roof extension purposes. |
| SW11 | Battersea / Clapham Junction | Victorian terraces, mansion blocks | Adjoining district to SW19, also inside Wandsworth for mansard roof extension purposes. |
| SW12 | Balham | Victorian and Edwardian terraces | Adjoining district to SW19, also inside Wandsworth for mansard roof extension purposes. |
| SW15 | Putney / Roehampton | Edwardian terraces, Victorian villas, mansion blocks | Adjoining district to SW19, also inside Wandsworth for mansard roof extension purposes. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | Adjoining district to SW19, also inside Wandsworth for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few SW19 streets, and each one changes what a mansard roof extension can achieve at that address.
How designation changes a SW19 (Wimbledon / Colliers Wood) mansard roof extension: Merton Council maintains 28 conservation areas, including Wimbledon Village, John Innes, Mitcham Cricket Green. Inside any of them a SW19 (Wimbledon / Colliers Wood) mansard roof extension cannot rely on permitted development, and the route becomes a £258 householder application determined in 8 weeks rather than a £120 prior approval in 6 weeks. Wimbledon Common sets the tone for SW19 (Wimbledon / Colliers Wood) casework.
SW19 (Wimbledon / Colliers Wood) permitted development status: there is no borough-wide direction from Merton Council, so a mansard roof extension at a SW19 address is normally still permitted development. We certify that with a £129 Lawful Development Certificate rather than leaving a SW19 (Wimbledon / Colliers Wood) sale to argue it later.
What SW19 (Wimbledon / Colliers Wood) is built from: 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. That mix decides the mansard roof extension route in SW19 (Wimbledon / Colliers Wood) more than the postcode does. Our fixed fee for mansard roof extensions in SW19 (Wimbledon / Colliers Wood) starts at £1,575, against £1,750 for the Complete package that carries a SW19 (Wimbledon / Colliers Wood) scheme through Merton Council planning and building regulations together.
How designation changes a SW19 (Wimbledon / Colliers Wood) mansard roof extension: Wandsworth Council maintains 45 conservation areas, including Wandsworth Common, Clapham Common West, Tonsley. Inside any of them a SW19 (Wimbledon / Colliers Wood) mansard roof extension cannot rely on permitted development, and the route becomes a £258 householder application determined in 8 weeks rather than a £120 prior approval in 6 weeks. Tonsley sets the tone for SW19 (Wimbledon / Colliers Wood) casework.
SW19 (Wimbledon / Colliers Wood) and Article 4: Article 4 for HMO conversions covering the whole borough. A mansard roof extension planned at a SW19 address is checked against that direction first; Wandsworth Council publishes the SW19 (Wimbledon / Colliers Wood) extent, and the SW19 line rarely follows the SW19 (Wimbledon / Colliers Wood) boundary you would expect.
What SW19 (Wimbledon / Colliers Wood) is built from: 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. That mix decides the mansard roof extension route in SW19 (Wimbledon / Colliers Wood) more than the postcode does. Our fixed fee for mansard roof extensions in SW19 (Wimbledon / Colliers Wood) starts at £1,575, against £1,750 for the Complete package that carries a SW19 (Wimbledon / Colliers Wood) scheme through Wandsworth Council planning and building regulations together.
Sources for this SW19 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.
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