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.
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 chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI 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: Article 4 removes PD for HMO conversions; restrictions on ground-floor shop-to-residential in certain streets.
Desktop study plus measured survey assessing existing foundations, ground conditions, water table level and underpinning viability for your Hammersmith and Fulham 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 and Fulham'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 and Fulham basement triggers Party Wall notices. We also manage Thames Water Build Over Agreements where within 3m of a public sewer.

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 free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Every Hammersmith and Fulham postcode district we draw in, the stock that dominates it and the authority that validates a basement conversion there. Hammersmith and Fulham fees below are the statutory England rates for 2026, not basement conversion estimates.
| Postcode | Area | Dominant stock | What it means for a basement conversion |
|---|---|---|---|
| SW6 | Fulham / Parsons Green | Victorian terraces, mansion blocks | A basement conversion at an SW6 address in Fulham / Parsons Green is determined by Hammersmith & Fulham Council under its own Local Plan policies for Fulham / Parsons Green. |
| W6 | Hammersmith / Brackenbury Village | Victorian terraces, mansion blocks | W6 covers Hammersmith / Brackenbury Village only; Hammersmith & Fulham Council handles the basement conversion, and Hammersmith / Brackenbury Village case officers apply the W6 conservation-area map. |
| W12 | Shepherd's Bush / White City | Victorian and Edwardian terraces | W12 covers Shepherd's Bush / White City only; Hammersmith & Fulham Council handles the basement conversion, and Shepherd's Bush / White City case officers apply the W12 conservation-area map. |
| 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. |
| SW10 | West Brompton / World's End | Georgian and Victorian terraces, listed buildings | West Brompton / World's End is split at SW10. Either RBKC Planning or Hammersmith & Fulham Council can determine a basement conversion here, so the SW10 address is checked against both policies maps first. |
Roof pitch, wall build-up and plot depth change every few Hammersmith and Fulham streets, and each one changes what a basement conversion can achieve at that 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.
Direct answers to the questions Hammersmith and Fulham homeowners ask every week about basement conversion drawings.
Start a free quote →Converting an existing cellar to habitable space in Hammersmith and Fulham usually does not require planning permission — it is an internal alteration. However, excavating a new basement, adding lightwells, or lowering floor levels to create a new storey typically does require planning. Hammersmith and Fulham does not have a borough-specific basement policy beyond the national framework — basement conversions are generally permissible subject to structural, drainage and flood-risk considerations. Thames Water Build Over Agreements apply where you're within 3m of a public sewer.
Basements are the most expensive way to add space in Hammersmith and Fulham, per square metre, because of underpinning, waterproofing and temporary works — all sequential and all engineered. Our package covers planning where required, building regulations, structural design and the BS 8102 waterproofing specification. See our fees.
Most properties in Hammersmith and Fulham can support a basement conversion, provided foundations are deep enough or can be underpinned, the water table is manageable, and there are no significant tree root or drainage constraints. Victorian and Edwardian houses in Hammersmith and Fulham often have existing cellars that can be deepened. We assess suitability at the initial survey.
BS 8102:2022 requires a waterproofing strategy appropriate to the site's water table and ground conditions. In Hammersmith and Fulham, this typically means a Type C cavity drain membrane system (most reliable), sometimes combined with Type A barrier protection. The strategy must be specified by a qualified waterproofing designer — included in our package.
A typical Hammersmith and Fulham basement conversion takes 6–12 months to build once drawings are approved. Our architectural package takes 5–8 weeks from instruction to Building Control submission. The longer build time reflects the sequential underpinning process, which must proceed in careful stages.

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