Mansard Roof Extensions · SW15 Putney
Wandsworth controls the West Putney and Embankment conservation areas; the hillside terraces and inter-war semis are a strong extension market.
This page covers one part of the borough. For the full picture — fees, timelines and the council's current position — read mansard roof extensions in Wandsworth.
A mansard roof extension adds a full storey behind a new sloping front face — a strong option on SW15's terraces in Putney where a standard dormer is too small. Wandsworth Council scrutinises mansards on townscape and precedent, especially within Putney Embankment, West Putney, Dover House Estate; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
Putney's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Putney conservation areas — with heritage statements and planning officer negotiation built in.
Across Putney, West Putney, Roehampton, Putney Heath in SW15, the dominant property is victorian and edwardian terraces near putney centre, inter-war semis up the hill, and large houses and post-war estates around roehampton. 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 Wandsworth Council judges each on design quality and neighbour impact. We survey the specific Putney property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the SW15 streetscape.
Housing stock in SW15: Victorian and Edwardian terraces near Putney centre, inter-war semis up the hill, and large houses and post-war estates around Roehampton.
Within the district: Putney, West Putney, Roehampton, Putney Heath.
Streets we know in SW15: the West Putney roads (Howards Lane, Carlton Drive), Putney Hill and the Dover House Estate. Each road has its own building line, boundary treatment and precedent that Wandsworth Council weighs when assessing a mansard roof extensions scheme.
Conservation areas: Putney Embankment, West Putney, Dover House Estate. Inside these, most external work needs full planning and a Heritage Statement.
Getting around SW15: East Putney on the District line and Putney rail to Waterloo, plus the riverbus.
Property values: around £550,000 for a flat and £1.1m-£1.7m for a house — a useful gauge of the build value an extension or loft adds in SW15.
Borough character: Family-oriented, high side-return extension and loft conversion rates; planning department experienced with Victorian terrace modifications.
We check against Wandsworth Council's mansard design guide and design to match the terrace.
Required for Putney's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Wandsworth Council committee.
Mansards invariably trigger Party Wall notices in Putney's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Wandsworth 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.
Yes. The Victorian and Edwardian terraces and inter-war semis around Howards Lane and Carlton Drive suit side-return, rear and double-storey extensions plus loft conversions, much of it within Permitted Development outside the conservation areas. We confirm the route and draw to Wandsworth's validation checklist.
Yes. The Putney Embankment conservation area and the Thames frontage carry both conservation control and flood-risk requirements, so riverside changes need full planning and a flood-risk assessment. We design within those constraints and produce the survey and heritage drawings required for SW15 riverside addresses.
Usually yes on the terraces and semis — a hip-to-gable plus rear dormer within the volume allowance, confirmed by a Lawful Development Certificate, provided you're not in the West Putney or Embankment conservation areas. We check the constraints for your road and draw it for Building Control.
The Dover House (Putney Garden) Estate is a designated conservation area of cottage-style housing with strong character controls, so extensions there are assessed tightly on form and materials. We design sympathetically and submit a full application with a Heritage Statement where required.
With Putney property at around £550,000 for a flat and £1.1m-£1.7m for a house, the professional drawing fee is a small fraction of the value the work adds to SW15's victorian and edwardian terraces near putney centre. Wandsworth Council charges its own statutory application fee on top (currently £548 for a householder planning application, £610 for a full application). We quote the drawings as one fixed price and the free site survey covers every SW15 address.
For a SW15 project across Putney, West Putney, Roehampton, Putney Heath, 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 Wandsworth Council (8 weeks for a householder application). We carry the Putney application through every officer query to the decision.
Putney (SW15) sits primarily in Wandsworth, so applications are decided by Wandsworth Council. Conservation areas within SW15 include Putney Embankment, West Putney, Dover House Estate, 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 Putney — 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 Wandsworth Council Building Control or an approved inspector. On SW15'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 Putney (SW15) property at around £550, 000 for a flat and £1.1m-£1.7m for a house, a well-designed extension or loft typically returns more than it costs in added floor area and sale value. 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 SW15 homes.
Local policy varies more between adjoining boroughs than most owners expect. Full service detail for SW4, SW11, SW12, SW16, SW17, SW18 and SW19.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every SW15 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. SW15 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 |
|---|---|---|---|
| SW15 | Putney / Roehampton | Edwardian terraces, Victorian villas, mansion blocks | Putney / Roehampton sits wholly inside SW15, so Wandsworth Council validates every mansard roof extension submitted from an SW15 address. |
| SW15 | Putney | Edwardian terraces, Victorian villas, mansion blocks | Putney sits inside SW15; mansard roof extension proposals here are determined by Wandsworth Council. |
| SW15 | Roehampton | Post-war estates, Georgian villas | Roehampton sits inside SW15; mansard roof extension proposals here are determined by Wandsworth Council. |
| SW11 | Battersea / Clapham Junction | Victorian terraces, mansion blocks | Adjoining district to SW15, also inside Wandsworth for mansard roof extension purposes. |
| SW12 | Balham | Victorian and Edwardian terraces | Adjoining district to SW15, also inside Wandsworth for mansard roof extension purposes. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | Adjoining district to SW15, also inside Wandsworth for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few SW15 streets, and each one changes what a mansard roof extension can achieve at that address.
How designation changes a SW15 (Putney / Roehampton) mansard roof extension: Wandsworth Council maintains 45 conservation areas, including Nightingale Triangle, Wandsworth Common, Clapham Common West. Inside any of them a SW15 (Putney / Roehampton) mansard roof extension cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Magdalen Park sets the tone for SW15 (Putney / Roehampton) casework.
SW15 (Putney / Roehampton) and Article 4: Article 4 for HMO conversions covering the whole borough. A mansard roof extension planned at a SW15 address is checked against that direction first; Wandsworth Council publishes the SW15 (Putney / Roehampton) extent, and the SW15 line rarely follows the SW15 (Putney / Roehampton) boundary you would expect.
What SW15 (Putney / Roehampton) 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 SW15 (Putney / Roehampton) more than the postcode does, and it is what a Wandsworth Council case officer reads first. A householder application costs £548 paid to Wandsworth Council direct, with 8 weeks to a decision once validated.
Sources for this SW15 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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