Basement Conversions · SW15 Putney
Wandsworth controls the West Putney and Embankment conservation areas; the hillside terraces and inter-war semis are a strong extension market.
If your property sits elsewhere in the borough, the borough-wide page for basement conversions in Wandsworth covers the same service across every ward.
Basement conversions and lowering existing cellars in Putney add space without touching the roofline — valuable on SW15's period houses around Putney, West Putney, Roehampton, Putney Heath. Wandsworth Council reviews structural, drainage and flood-risk impact, and a Party Wall award plus a Thames Water build-over agreement are usually required. We coordinate the structural engineer and the waterproofing design.
Full architectural technology service for basement digs and cellar conversions in Putney — structural underpinning design, waterproofing strategy, Party Wall coordination, planning where required, and building regulations through to completion certificate.
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 basement conversion drawings 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 basement conversion drawings 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.
Desktop study plus measured survey assessing existing foundations, ground conditions, water table level and underpinning viability for your Putney property.
New-build basements and lightwell extensions need planning permission. Cellar conversions of existing space are usually Permitted Development. We confirm the route and submit where needed.
Underpinning sequence drawings, reinforced concrete design, temporary works strategy — all to Eurocode with chartered engineer sign-off.
BS 8102:2022 compliant — cavity drain, cementitious tanking or membrane system specified for Putney's ground conditions and water table.
Full Plans application to Wandsworth Council Building Control or an approved inspector covering structure (Part A), fire safety (Part B), damp-proofing (Part C), ventilation (Part F) and thermal performance (Part L).
Almost every Putney basement triggers Party Wall notices. We also manage Thames Water Build Over Agreements where within 3m of a public sewer.
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 basement conversion drawings 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.
If your site sits close to the edge of the borough, it is worth checking the authority next door. Browse everything we do in 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 basement conversion there. SW15 fees below are the statutory England rates for 2026, not basement conversion estimates.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| SW15 | Putney / Roehampton | Edwardian terraces, Victorian villas, mansion blocks | Putney / Roehampton sits wholly inside SW15, so Wandsworth Council validates every basement conversion submitted from an SW15 address. |
| SW15 | Putney | Edwardian terraces, Victorian villas, mansion blocks | Putney sits inside SW15; basement conversion proposals here are determined by Wandsworth Council. |
| SW15 | Roehampton | Post-war estates, Georgian villas | Roehampton sits inside SW15; basement conversion proposals here are determined by Wandsworth Council. |
| SW11 | Battersea / Clapham Junction | Victorian terraces, mansion blocks | Adjoining district to SW15, also inside Wandsworth for basement conversion purposes. |
| SW12 | Balham | Victorian and Edwardian terraces | Adjoining district to SW15, also inside Wandsworth for basement conversion purposes. |
| SW17 | Tooting / Earlsfield | Edwardian terraces | Adjoining district to SW15, also inside Wandsworth for basement conversion purposes. |
Roof pitch, wall build-up and plot depth change every few SW15 streets, and each one changes what a basement conversion can achieve at that address.
How designation changes a SW15 (Putney / Roehampton) basement conversion: Wandsworth Council maintains 45 conservation areas, including Clapham Common West, Tonsley, Magdalen Park. Inside any of them a SW15 (Putney / Roehampton) basement conversion 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. Wandsworth Common sets the tone for SW15 (Putney / Roehampton) casework.
What Article 4 removes near SW15 (Putney / Roehampton): Article 4 for HMO conversions covering the whole borough. Before pricing a basement conversion we check whether the SW15 address is inside the mapped area, because Wandsworth Council draws the SW15 (Putney / Roehampton) boundary street by street rather than across the whole of SW15 (Putney / Roehampton).
SW15 (Putney / Roehampton) 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 basement conversion route in SW15 (Putney / Roehampton) — construction, not postcode, sets what is achievable. Wandsworth Council charges £548 for a householder application and has 8 weeks to determine it.
Sources for this SW15 basement conversion 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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