Everything a basement dig or cellar conversion in this borough needs: underpinning design, a waterproofing strategy, party wall coordination, the planning application where one is required, and building regulations carried through to the completion certificate.
In Hammersmith and Fulham — Victorian and Edwardian terraces — particularly two-storey bay-fronted terraces south of the river in Fulham and Parsons Green; mansion blocks along main roads for the most part — a basement conversion drawings package is the full measured-survey-to-submission drawing set London Borough of Hammersmith and Fulham needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the architectural technologist team at Architectural Drawings London — CIAT Affiliate, professional indemnity insured.Last reviewed 2026-08-03.
Full architectural technology service for basement digs and cellar conversions in Hammersmith and Fulham — structural underpinning design, waterproofing strategy, Party Wall coordination, planning where required, and building regulations through to completion certificate.
Housing stock in Hammersmith and Fulham: Victorian and Edwardian terraces — particularly two-storey bay-fronted terraces south of the river in Fulham and Parsons Green; mansion blocks along main roads.
Character: Suburban-feel residential streets with strong conservation area coverage; well-established mansard precedents on many terraces.
Article 4: here, Article 4 takes away permitted development for HMO conversions, and restricts shop-to-residential change at ground floor along certain named streets.
Before anything is priced, a desktop study and a measured survey establish how deep the existing foundations go, what sort of ground sits beneath them, how high the water stands, and whether underpinning is realistic at that particular address.
Dig a new basement or open a lightwell and you need planning permission. Convert a cellar that already exists and you usually do not, because nothing outside the building changes. We work out which of the two you are doing, and apply where the answer is the first one.
Underpinning drawn as a sequence, reinforced concrete designed to Eurocode, and a temporary works strategy that says how the house stands up while the ground beneath it is removed. All of it signed by a chartered engineer.
Waterproofing to BS 8102:2022, with the system chosen for the ground you actually have: cavity drain, cementitious tanking, or a membrane. That choice matters more here than in most of London. Zone 3 of the Environment Agency's flood mapping sits under 51.94% of the borough's 16.4 square kilometres, and Zone 2 under 59.25%, so a large share of addresses fall where a Flood Risk Assessment becomes a required document. Contains public sector information licensed under the Open Government Licence v3.0
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).
Party wall notices are effectively unavoidable on a basement here, given how little of the borough is detached. Where the excavation falls within three metres of a public sewer, a Thames Water build-over agreement is needed too, and we handle that alongside.
Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a site survey.
Build costs are separate and quoted by your contractor. See our published fees.
The postcode districts we draw in across the borough, the stock filling each, and who validates a basement scheme from that address. Note that the fees in the table are statutory England planning charges set for 2026; they say nothing about what a basement will cost you.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| SW6 | Fulham / Parsons Green | Victorian terraces, mansion blocks | SW6 covers Fulham and Parsons Green, all of it determined by Hammersmith and Fulham Council, applying the Local Plan policies drawn up for that end of the borough. |
| W6 | Hammersmith / Brackenbury Village | Victorian terraces, mansion blocks | W6 takes in Hammersmith itself and Brackenbury Village, again determined by Hammersmith and Fulham Council against the conservation area mapping covering those streets. |
| W12 | Shepherd's Bush / White City | Victorian and Edwardian terraces | W12 is Shepherd's Bush and White City, decided by Hammersmith and Fulham Council, with the case officer reading the address against the conservation area mapping for the district. |
| W14 | West Kensington / Barons Court | Victorian and Edwardian villas | W14, taking in West Kensington and Barons Court, is cut by the borough boundary. A basement there may be determined by Hammersmith and Fulham or by RBKC, and the W14 policies map settles which, street by street. |
| SW10 | West Brompton / World's End | Georgian and Victorian terraces, listed buildings | SW10 at West Brompton and World's End is divided the same way. Either RBKC or Hammersmith and Fulham could hold the file, so two policies maps get checked rather than one. |
Wall construction, plot depth and what is under the garden all change within a few streets here, and every one of them changes what a basement can achieve at a particular address.
How designation changes a Hammersmith and Fulham basement conversion: Hammersmith & Fulham Council maintains 45 conservation areas, including Walham Green, Hammersmith Grove, Brackenbury Village. Inside any of them a Hammersmith and Fulham 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. Walham Green sets the tone for Hammersmith and Fulham casework.
Hammersmith and Fulham and Article 4: Article 4 removes PD for HMO conversions; restrictions on ground-floor shop-to-residential in certain streets. A basement conversion planned at a SW6 address is checked against that direction first; Hammersmith & Fulham Council publishes the Hammersmith and Fulham extent, and the SW6 line rarely follows the Hammersmith and Fulham boundary you would expect.
The building fabric around Hammersmith and Fulham: 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 Hammersmith and Fulham 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 Hammersmith and Fulham 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.
Straight answers to what people in the borough actually ask us before committing to a basement scheme.
Start a free quote →Turning an existing cellar into habitable space normally needs no planning permission at all, being an internal alteration. Excavating a new basement, forming a lightwell or dropping floor levels to create a storey is a different matter and generally does. Where an application is required, the reassuring part is who decides it: 3,759 of the 3,826 applications this council determined over three years were settled by officers under delegated powers, 98.2% of them, against 97.0% across the 33 boroughs pooled. A basement scheme is far more likely to be judged on drawings and technical reports than in front of a committee. Check the current Local Plan for basement-specific policy before designing, since councils change that more often than the national framework, and remember the Thames Water build-over agreement if you are within three metres of a public sewer. Source: MHCLG live planning statistics
Per square metre, a basement is the most expensive space you can add. The reason is that underpinning, waterproofing and temporary works are sequential and each is engineered rather than assembled. Our quote takes in the planning application where one is needed, the building regulations submission, the structural design, and a waterproofing specification written to BS 8102. See our fees.
Most houses here will take a basement, provided the foundations are deep enough or can be underpinned, the water table is manageable, and no tree roots or drain runs get in the way. There is more raw material for it than in most boroughs: 48.1% of the local housing stock pre-dates 1900, and Victorian and Edwardian houses of that age frequently have a cellar already, which changes the job from excavation to deepening. Suitability is assessed at the first survey, not guessed at from a postcode.
The standard wants a waterproofing strategy matched to the water table and to the ground holding it. On sites we see in this borough the usual answer is a cavity drain membrane, Type C, sometimes with Type A barrier protection behind it, and BS 8102 requires the strategy to come from a qualified waterproofing designer rather than from whoever is building it. That designer's input is inside our package.
Building a basement here takes six months to a year once drawings are approved, and the drawings themselves run five to eight weeks between instruction and the submission to Building Control. The build is long because underpinning proceeds in short bays, one at a time, each left to cure before the next is cut.
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