Basement Conversions · W14 West Kensington
Fixed-fee basement conversion drawings for West Kensington, Barons Court, Olympia, Holland Park fringe in the W14 postcode, drawn by an MCIAT-chartered architectural technologist and submitted to Hammersmith & Fulham Council. W14 spans Hammersmith & Fulham and Kensington & Chelsea; conservation control is strong around Barons Court, and the Earls Court scheme borders the area.
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.
Basement conversions and lowering existing cellars in West Kensington add space without touching the roofline — valuable on W14's period houses around West Kensington, Barons Court, Olympia, Holland Park fringe. 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 West Kensington — structural underpinning design, waterproofing strategy, Party Wall coordination, planning where required, and building regulations through to completion certificate.
Across West Kensington, Barons Court, Olympia, Holland Park fringe in W14, the dominant property is grand victorian terraces and mansion blocks around west kensington and barons court, with artists' studio houses near holland park. 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 West Kensington property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the W14 streetscape.
Housing stock in W14: Grand Victorian terraces and mansion blocks around West Kensington and Barons Court, with artists' studio houses near Holland Park.
Within the district: West Kensington, Barons Court, Olympia, Holland Park fringe.
Streets we know in W14: the Barons Court streets (Gledstanes Road, Castletown Road), the Gibbs Green area and the Edwardes Square fringe. 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: Barons Court, West Kensington, Edwardes Square / Scarsdale fringe. Inside these, most external work needs full planning and a Heritage Statement.
Getting around W14: West Kensington and Barons Court on the District and Piccadilly lines, plus Kensington Olympia.
Regeneration: West Kensington falls within or beside the Earls Court / West Kensington regeneration, which shapes local planning policy and design expectations.
Property values: around £550,000 for a flat and £1.2m-£2m for a house — a useful gauge of the build value an extension or loft adds in W14.
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 West Kensington 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 West Kensington'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 West Kensington 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, but the handsome Victorian terraces around Gledstanes Road and Castletown Road sit in the Barons Court conservation area, so rear and side extensions and roof changes need full planning with a Heritage Statement rather than Permitted Development. We design to match the period detailing and submit to Hammersmith & Fulham.
W14 straddles the boundary — West Kensington and Barons Court largely sit in Hammersmith & Fulham, with the eastern edge toward Holland Park in Kensington & Chelsea. The two councils apply different conservation and basement controls, so we confirm your exact authority before quoting.
The major Earls Court / West Kensington regeneration borders W14, bringing thousands of new homes and improved public realm, supporting values. For a house project the binding controls remain Permitted Development limits and the local conservation area, which we check for your address.
Yes. The mansion blocks around West Kensington and Olympia usually have freeholder controls alongside council planning, and any external change needs full consent. We produce drawings that satisfy both the freeholder and the council, and handle Party Wall matters between flats.
Our fixed fee for basement conversion drawings in West Kensington starts at £1,950 — no hourly billing. With West Kensington property at around £550,000 for a flat and £1.2m-£2m for a house, the professional drawing fee is a small fraction of the value the work adds to W14's grand victorian terraces and mansion blocks around. Hammersmith & Fulham 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 W14 address.
For a W14 project across West Kensington, Barons Court, Olympia, Holland Park fringe, 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 West Kensington application through every officer query to the decision.
West Kensington (W14) sits primarily in Hammersmith and Fulham, so applications are decided by Hammersmith & Fulham Council. Article 4 in force in the borough: Yes. Conservation areas within W14 include Barons Court, West Kensington, Edwardes Square / Scarsdale fringe, 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 West Kensington — 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 W14'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 West Kensington (W14) property at around £550,000 for a flat and £1.2m-£2m 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 £1,950 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 W14 homes.
From £840.
From £840.
From £1,225.
From £1,225.
From £1,575.
From £995.
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 W14 postcode district we draw in, the stock that dominates it and the authority that validates a basement conversion there. W14 fees below are the statutory England rates for 2026, not basement conversion estimates.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| W14 | West Kensington / Barons Court | Victorian and Edwardian villas | A basement conversion in West Kensington / Barons Court may land with Hammersmith & Fulham Council or RBKC Planning — W14 crosses the boundary, and the W14 policies map decides it street by street. |
| W14 | Barons Court | Edwardian mansion blocks, Victorian terraces | Barons Court sits inside W14; basement conversion proposals here are determined by Hammersmith & Fulham Council. |
| W14 | Holland Park | Victorian and Edwardian villas | Holland Park sits inside W14; basement conversion proposals here are determined by RBKC Planning. |
| SW6 | Fulham / Parsons Green | Victorian terraces, mansion blocks | Adjoining district to W14, also inside Hammersmith and Fulham for basement conversion purposes. |
| W6 | Hammersmith / Brackenbury Village | Victorian terraces, mansion blocks | Adjoining district to W14, also inside Hammersmith and Fulham for basement conversion purposes. |
| W12 | Shepherd's Bush / White City | Victorian and Edwardian terraces | Adjoining district to W14, also inside Hammersmith and Fulham for basement conversion purposes. |
| SW3 | Chelsea / Brompton | Georgian and Victorian terraces, listed buildings | Adjoining district to W14, also inside Kensington and Chelsea for basement conversion purposes. |
| SW5 | Earl's Court | Stucco terraces, Edwardian mansion blocks | Adjoining district to W14, also inside Kensington and Chelsea for basement conversion purposes. |
| SW7 | South Kensington / Knightsbridge | Stucco terraces, mansion blocks, listed buildings | Adjoining district to W14, also inside Kensington and Chelsea for basement conversion purposes. |
| SW10 | West Brompton / World's End | Georgian and Victorian terraces, listed buildings | Adjoining district to W14, also inside Kensington and Chelsea for basement conversion purposes. |
Roof pitch, wall build-up and plot depth change every few W14 streets, and each one changes what a basement conversion can achieve at that address.
Conservation areas covering W14 (West Kensington / Barons Court): Hammersmith & Fulham Council runs 45, and Fulham Palace Road, Parsons Green, Walham Green are the ones W14 (West Kensington / Barons Court) owners meet most. A basement conversion inside a W14 (West Kensington / Barons Court) conservation area loses permitted development, so the W14 (West Kensington / Barons Court) submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Hammersmith Grove a basement conversion is judged on the street elevation first.
What Article 4 removes near W14 (West Kensington / Barons Court): 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 W14 address is inside the mapped area, because Hammersmith & Fulham Council draws the W14 (West Kensington / Barons Court) boundary street by street rather than across the whole of W14 (West Kensington / Barons Court).
What W14 (West Kensington / Barons Court) is built from: 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. That mix decides the basement conversion route in W14 (West Kensington / Barons Court) more than the postcode does. Our fixed fee for basement conversions in W14 (West Kensington / Barons Court) starts at £1,950, against £1,750 for the Complete package that carries a W14 (West Kensington / Barons Court) scheme through Hammersmith & Fulham Council planning and building regulations together.
Conservation areas covering W14 (West Kensington / Barons Court): RBKC Planning runs 38, and Notting Hill, Holland Park, Earls Court are the ones W14 (West Kensington / Barons Court) owners meet most. A basement conversion inside a W14 (West Kensington / Barons Court) conservation area loses permitted development, so the W14 (West Kensington / Barons Court) submission is a householder application at £258 decided in 8 weeks — not a £120 prior approval decided in 6 weeks. In Kensington a basement conversion is judged on the street elevation first.
What Article 4 removes near W14 (West Kensington / Barons Court): Article 4 Directions covering HMOs, office-to-residential, and basement developments — RBKC has some of the strictest basement policies in London. Before pricing a basement conversion we check whether the W14 address is inside the mapped area, because RBKC Planning draws the W14 (West Kensington / Barons Court) boundary street by street rather than across the whole of W14 (West Kensington / Barons Court).
Digging below a W14 (West Kensington / Barons Court) property: RBKC's basement policy (post-2015) limits to single-storey under 50% of garden area; double-storey basements effectively prohibited in residential streets. Where a basement conversion in W14 (West Kensington / Barons Court) involves excavation that is read beside the Party Wall etc. Act 1996, which needs two months notice for a W14 (West Kensington / Barons Court) dig within 3 m of a neighbour, and RBKC Planning expects the W14 ground conditions addressed in the application.
What W14 (West Kensington / Barons Court) is built from: Grand white stucco Regency and Victorian terraces; red-brick Queen Anne mansions in Kensington; Edwardian mansion blocks; almost no post-war housing stock. Internationally wealthy residents; extensive listed building coverage; heritage and streetscape prioritised in every decision. That mix decides the basement conversion route in W14 (West Kensington / Barons Court) more than the postcode does. Our fixed fee for basement conversions in W14 (West Kensington / Barons Court) starts at £1,950, against £1,750 for the Complete package that carries a W14 (West Kensington / Barons Court) scheme through RBKC Planning planning and building regulations together.
Sources for this W14 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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