Mansard Roof Extensions · W6 Hammersmith
Fixed-fee mansard roof extensions for Hammersmith, Brackenbury Village, Ravenscourt Park, Hammersmith riverside in the W6 postcode, drawn by an MCIAT-chartered architectural technologist and submitted to Hammersmith & Fulham Council. Hammersmith & Fulham controls several W6 conservation areas; the Brackenbury Village grid and riverside terraces have strong character protection.
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.
A mansard roof extension adds a full storey behind a new sloping front face — a strong option on W6's terraces in Hammersmith where a standard dormer is too small. Hammersmith & Fulham Council scrutinises mansards on townscape and precedent, especially within Brackenbury, Ravenscourt, Hammersmith Mall, St Peter's Square; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
Hammersmith's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Hammersmith conservation areas — with heritage statements and planning officer negotiation built in.
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 mansard roof extensions 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 mansard roof extensions 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.
We check against Hammersmith & Fulham Council's mansard design guide and design to match the terrace.
Required for Hammersmith's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Hammersmith & Fulham Council committee.
Mansards invariably trigger Party Wall notices in Hammersmith's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Hammersmith & Fulham Council planning officer, committee representation if called in.
Part L thermal, Part B fire (critical on mansards), Part E acoustic separation.
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.
Our fixed fee for mansard roof extensions in Hammersmith starts at £1,575 — no hourly billing. 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 £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 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. Article 4 in force in the borough: Yes. 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 mansard roof extensions 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, while our fixed drawing fee from £1,575 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 W6 homes.
From £840.
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From £995.
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Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
Every W6 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. W6 fees below are the statutory England rates for 2026, not mansard roof extension estimates.
| Postcode | Area | Dominant stock | What it means for a mansard roof extension |
|---|---|---|---|
| W6 | Hammersmith / Brackenbury Village | Victorian terraces, mansion blocks | A mansard roof extension at an W6 address in Hammersmith / Brackenbury Village is determined by Hammersmith & Fulham Council under its own Local Plan policies for Hammersmith / Brackenbury Village. |
| W6 | Hammersmith | Victorian terraces, mansion blocks | Hammersmith sits inside W6; mansard roof extension proposals here are determined by Hammersmith & Fulham Council. |
| W6 | Brackenbury Village | Victorian terraces | Brackenbury Village sits inside W6; mansard roof extension 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 mansard roof extension purposes. |
| W12 | Shepherd's Bush / White City | Victorian and Edwardian terraces | Adjoining district to W6, also inside Hammersmith and Fulham for mansard roof extension purposes. |
| W14 | West Kensington / Barons Court | Victorian and Edwardian villas | Adjoining district to W6, also inside Hammersmith and Fulham for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few W6 streets, and each one changes what a mansard roof extension can achieve at that address.
W6 (Hammersmith / Brackenbury Village) conservation designations: there are 45 across Hammersmith & Fulham Council, Fulham Palace Road, Parsons Green, Walham Green among them. Designation costs a W6 (Hammersmith / Brackenbury Village) owner the permitted-development route: a mansard roof extension then needs a £258 householder application over 8 weeks, in place of the £120 prior approval route that takes 6 weeks. Walham Green is the W6 (Hammersmith / Brackenbury Village) designation that most often changes a mansard roof extension design.
W6 (Hammersmith / Brackenbury Village) and Article 4: Article 4 removes PD for HMO conversions; restrictions on ground-floor shop-to-residential in certain streets. A mansard roof extension planned at a W6 address is checked against that direction first; Hammersmith & Fulham Council publishes the W6 (Hammersmith / Brackenbury Village) extent, and the W6 line rarely follows the W6 (Hammersmith / Brackenbury Village) boundary you would expect.
What W6 (Hammersmith / Brackenbury Village) 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 mansard roof extension route in W6 (Hammersmith / Brackenbury Village) more than the postcode does. Our fixed fee for mansard roof extensions in W6 (Hammersmith / Brackenbury Village) starts at £1,575, against £1,750 for the Complete package that carries a W6 (Hammersmith / Brackenbury Village) scheme through Hammersmith & Fulham Council planning and building regulations together.
Sources for this W6 mansard roof extension 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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