Basement Conversions · W6 Hammersmith
Hammersmith & Fulham controls several W6 conservation areas; the Brackenbury Village grid and riverside terraces have strong character protection.
If your property sits elsewhere in the borough, the borough-wide page for basement conversions in Hammersmith and Fulham covers the same service across every ward.
Basement conversions and lowering existing cellars in Hammersmith add space without touching the roofline — valuable on W6's period houses around Hammersmith, Brackenbury Village, Ravenscourt Park, Hammersmith riverside. Hammersmith & Fulham 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 Hammersmith — structural underpinning design, waterproofing strategy, Party Wall coordination, planning where required, and building regulations through to completion certificate.
Across Hammersmith, Brackenbury Village, Ravenscourt Park, Hammersmith riverside in W6, the dominant property is victorian and georgian terraces, riverside houses and mansion blocks across hammersmith and the brackenbury village streets. 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 Hammersmith & Fulham Council judges each on design quality and neighbour impact. We survey the specific Hammersmith property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the W6 streetscape.
Housing stock in W6: Victorian and Georgian terraces, riverside houses and mansion blocks across Hammersmith and the Brackenbury Village streets.
Within the district: Hammersmith, Brackenbury Village, Ravenscourt Park, Hammersmith riverside.
Streets we know in W6: the Brackenbury Village grid, Hamlet Gardens, Ravenscourt Road and the Upper Mall riverside terraces. Each road has its own building line, boundary treatment and precedent that Hammersmith & Fulham Council weighs when assessing a basement conversion drawings scheme.
Conservation areas: Brackenbury, Ravenscourt, Hammersmith Mall, St Peter's Square. Inside these, most external work needs full planning and a Heritage Statement.
Getting around W6: Hammersmith on the District, Piccadilly, Circle and Hammersmith & City lines.
Regeneration: Hammersmith falls within or beside the Hammersmith town centre and riverside, which shapes local planning policy and design expectations.
Property values: around £600,000 for a flat and £1.2m-£1.8m for a house — a useful gauge of the build value an extension or loft adds in W6.
Borough character: Suburban-feel residential streets with strong conservation area coverage; well-established mansard precedents on many terraces.
Desktop study plus measured survey assessing existing foundations, ground conditions, water table level and underpinning viability for your Hammersmith 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 Hammersmith's ground conditions and water table.
Full Plans application to Hammersmith & Fulham 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 Hammersmith 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 terraces in the Brackenbury grid suit side-return and rear kitchen extensions and loft conversions, but most of the grid is a conservation area, so full planning with a Heritage Statement is typically required rather than Permitted Development. We design to match the original brick and detailing and submit to Hammersmith & Fulham.
Yes. The Upper Mall and St Peter's Square houses are in conservation areas, several are listed, and the riverside sits in the Thames flood zone, so changes need full planning, often Listed Building Consent, and a flood-risk assessment. We provide the heritage and survey drawings these specialist projects require.
Usually yes, but inside the Ravenscourt conservation area a rear dormer needs full planning and front roof changes are resisted. We design the dormer to sit discreetly within the roofscape and detail it to match, submitting to Hammersmith & Fulham. Outside the conservation area, Permitted Development may apply.
Allow roughly 3-4 weeks for the drawings and around 8 weeks for the council's householder determination once submitted. On the Brackenbury and riverside conservation roads, consultation can add time, which we flag up front and carry through every officer query.
With Hammersmith property at around £600,000 for a flat and £1.2m-£1.8m for a house, the professional drawing fee is a small fraction of the value the work adds to W6's victorian and georgian terraces, riverside houses and. Hammersmith & Fulham 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 W6 address.
For a W6 project across Hammersmith, Brackenbury Village, Ravenscourt Park, Hammersmith riverside, 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 Hammersmith & Fulham Council (8 weeks for a householder application). We carry the Hammersmith application through every officer query to the decision.
Hammersmith (W6) sits primarily in Hammersmith and Fulham, so applications are decided by Hammersmith & Fulham Council. Conservation areas within W6 include Brackenbury, Ravenscourt, Hammersmith Mall, St Peter's Square, 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 Hammersmith — 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 Hammersmith & Fulham Council Building Control or an approved inspector. On W6'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 Hammersmith (W6) property at around £600, 000 for a flat and £1.2m-£1.8m 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 W6 homes.
Moving, or weighing up a site in the next borough along? Here is the complete service list for SW6, W12 and W14.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every W6 postcode district we draw in, the stock that dominates it and the authority that validates a basement conversion there. W6 fees below are the statutory England rates for 2026, not basement conversion estimates.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| W6 | Hammersmith / Brackenbury Village | Victorian terraces, mansion blocks | W6 covers Hammersmith / Brackenbury Village only; Hammersmith & Fulham Council handles the basement conversion. |
| W6 | Hammersmith | Victorian terraces, mansion blocks | Hammersmith sits inside W6; basement conversion proposals here are determined by Hammersmith & Fulham Council. |
| W6 | Brackenbury Village | Victorian terraces | Brackenbury Village sits inside W6; basement conversion proposals here are determined by Hammersmith & Fulham Council. |
| SW6 | Fulham / Parsons Green | Victorian terraces, mansion blocks | Adjoining district to W6, also inside Hammersmith and Fulham for basement conversion purposes. |
| W12 | Shepherd's Bush / White City | Victorian and Edwardian terraces | Adjoining district to W6, also inside Hammersmith and Fulham for basement conversion purposes. |
| W14 | West Kensington / Barons Court | Victorian and Edwardian villas | Adjoining district to W6, also inside Hammersmith and Fulham for basement conversion purposes. |
Roof pitch, wall build-up and plot depth change every few W6 streets, and each one changes what a basement conversion can achieve at that address.
How designation changes a W6 (Hammersmith / Brackenbury Village) basement conversion: Hammersmith & Fulham Council maintains 45 conservation areas, including Brackenbury Village, Fulham Palace Road, Parsons Green. Inside any of them a W6 (Hammersmith / Brackenbury Village) 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. Parsons Green sets the tone for W6 (Hammersmith / Brackenbury Village) casework.
What Article 4 removes near W6 (Hammersmith / Brackenbury Village): Article 4 removes PD for HMO conversions; restrictions on ground-floor shop-to-residential in certain streets. Before pricing a basement conversion we check whether the W6 address is inside the mapped area, because Hammersmith & Fulham Council draws the W6 (Hammersmith / Brackenbury Village) boundary street by street rather than across the whole of W6 (Hammersmith / Brackenbury Village).
The building fabric around W6 (Hammersmith / Brackenbury Village): Victorian and Edwardian terraces — particularly two-storey bay-fronted terraces south of the river in Fulham and Parsons Green; mansion blocks along main roads. Suburban-feel residential streets with strong conservation area coverage; well-established mansard precedents on many terraces. A basement conversion in W6 (Hammersmith / Brackenbury Village) 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 Hammersmith & Fulham Council.
Sources for this W6 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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