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Basement Conversions · Hammersmith and Fulham

Basement Conversion Drawings in Hammersmith and Fulham

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.

No hourly billing 5–8 weeks to submission Covering all Hammersmith and Fulham postcodes

London period house exterior with architectural character — basement conversions in Hammersmith & Fulham

What is a basement conversion drawings package in Hammersmith and Fulham?

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.

Planning authority
London Borough of Hammersmith and Fulham
Postcode districts
W6, W12, W14, SW6, SW10
Article 4
Article 4 removes PD for HMO conversions; restrictions on ground-floor shop-to-residential in certain streets.
Typical housing stock
Victorian and Edwardian terraces — particularly two-storey bay-fronted terraces south of the river in Fulham and Parsons Green; mansion blocks along main roads
Conservation areas
45 in Hammersmith and Fulham
Timeline
5–8 weeks to submission

Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.

Quick facts · Basement Conversions in Hammersmith and Fulham

Fees
See our fees
Typical turnaround
5–8 weeks to submission
Planning authority
Hammersmith & Fulham Council
Conservation areas
45 in Hammersmith and Fulham
Article 4 Direction
Yes
Postcodes covered
W6 and others
Planning context

How does planning policy in Hammersmith and Fulham affect your basement conversion drawings?

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.

Population
184,000
Conservation areas
45
Planning authority
Hammersmith & Fulham Council
Postcodes
5 areas
What's included

Fully end-to-end in Hammersmith and Fulham.

Feasibility & structural survey

Desktop study plus measured survey assessing existing foundations, ground conditions, water table level and underpinning viability for your Hammersmith and Fulham property.

Planning application (where required)

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.

Structural engineering package

Underpinning sequence drawings, reinforced concrete design, temporary works strategy — all to Eurocode with chartered engineer sign-off.

Waterproofing strategy

BS 8102:2022 compliant — cavity drain, cementitious tanking or membrane system specified for Hammersmith and Fulham's ground conditions and water table.

Building Regulations submission

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 & Thames Water coordination

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.

An architectural technologist checking a printed set of house drawings, marking a proposed elevation in red — basement conversion drawings in Hammersmith and Fulham
Every set is checked line by line against the validation checklist before it leaves the office.
30% below London architects

How much do basement conversion drawings cost in Hammersmith and Fulham?

Essentials

Single planning or regs submission.

  • Measured survey
  • Drawings & submission
  • Unlimited revisions
Start Essentials →

Bespoke

Listed, conservation, complex sites.

  • Everything in Complete
  • Heritage Statement
  • Committee representation
Discuss Bespoke →
Victorian bay-fronted terrace in Fulham SW6
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Estimate your drawing costs in Hammersmith and Fulham

Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.

1 · Project type
2 · Approximate size
30
3 · Add compliance packages
Indicative design fee £1,585
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Build costs are separate and quoted by your contractor. See our published fees.

Where in Hammersmith and Fulham does a basement conversion actually get determined?

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.

PostcodeAreaDominant stockWhat it means for a basement conversion
SW6Fulham / Parsons GreenVictorian terraces, mansion blocksA 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.
W6Hammersmith / Brackenbury VillageVictorian terraces, mansion blocksW6 covers Hammersmith / Brackenbury Village only; Hammersmith & Fulham Council handles the basement conversion, and Hammersmith / Brackenbury Village case officers apply the W6 conservation-area map.
W12Shepherd's Bush / White CityVictorian and Edwardian terracesW12 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.
W14West Kensington / Barons CourtVictorian and Edwardian villasA 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.
SW10West Brompton / World's EndGeorgian and Victorian terraces, listed buildingsWest 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.

Which Hammersmith and Fulham neighbourhoods suit a basement conversion best?

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.

What local planning policy applies to a basement conversion in Hammersmith and Fulham?

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.

Who decides a basement conversion on the edge of Hammersmith and Fulham?

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.

Hammersmith and Fulham FAQs

Basement Conversions in Hammersmith and Fulham — your questions answered.

Direct answers to the questions Hammersmith and Fulham homeowners ask every week about basement conversion drawings.

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Do I need planning permission for a basement conversion in Hammersmith and Fulham?

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.

How much does a basement conversion cost in Hammersmith and Fulham?

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.

Is my Hammersmith and Fulham property suitable for a basement conversion?

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.

What waterproofing does a Hammersmith and Fulham basement need?

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.

How long does a basement conversion take in Hammersmith and Fulham?

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.

A printed planning application drawing set — proposed elevations, floor plans and the os location plan with the site outlined in red — basement conversion drawings in Hammersmith and Fulham
The planning set that goes to the council through the Planning Portal: proposed elevations, plans, and the OS location plan with your site outlined.
Nearby boroughs

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