Mansard Roof Extensions · W7 Hanwell
Ealing controls the Hanwell Village Green and Churchfields conservation areas; the Elizabeth line has lifted demand across W7.
Working across the whole borough rather than just this area? See mansard roof extensions in Ealing.
A mansard roof extension adds a full storey behind a new sloping front face — a strong option on W7's terraces in Hanwell where a standard dormer is too small. Ealing Council scrutinises mansards on townscape and precedent, especially within Hanwell Village Green, Churchfields, St Mary's Hanwell; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
Hanwell's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Hanwell conservation areas — with heritage statements and planning officer negotiation built in.
Across Hanwell, Boston Manor fringe, Churchfields, West Ealing fringe in W7, the dominant property is edwardian and inter-war terraces and semis around hanwell, with cottage-style streets near the brent valley and pockets of larger housing. 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 Ealing Council judges each on design quality and neighbour impact. We survey the specific Hanwell property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the W7 streetscape.
Housing stock in W7: Edwardian and inter-war terraces and semis around Hanwell, with cottage-style streets near the Brent valley and pockets of larger housing.
Within the district: Hanwell, Boston Manor fringe, Churchfields, West Ealing fringe.
Streets we know in W7: the Churchfields and Golden Manor streets, Boston Road, Cuckoo Estate roads and the Hanwell village streets. Each road has its own building line, boundary treatment and precedent that Ealing Council weighs when assessing a mansard roof extensions scheme.
Conservation areas: Hanwell Village Green, Churchfields, St Mary's Hanwell. Inside these, most external work needs full planning and a Heritage Statement.
Getting around W7: Hanwell on the Elizabeth line, with quick links to central London and Heathrow.
Regeneration: Hanwell falls within or beside the Elizabeth line growth corridor, which shapes local planning policy and design expectations.
Property values: Ealing's residential market turned over 2,819 sales in 2025 at a £532,750 median. W7 came in a shade dearer, £550,000, though on a much smaller base of 255 transactions. Source: HM Land Registry Price Paid Data
Borough character: Leafy outer-west London; Bedford Park conservation area has strict heritage controls; rest of borough generally permissive.
We check against Ealing Council's mansard design guide and design to match the terrace.
Required for Hanwell's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Ealing Council committee.
Mansards invariably trigger Party Wall notices in Hanwell's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Ealing 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 Edwardian and inter-war terraces and semis around Churchfields and Boston Road suit rear and side extensions plus loft conversions, much of it within Permitted Development outside the conservation areas, confirmed with a Lawful Development Certificate. We confirm the route and draw to Ealing's checklist.
Hanwell on the Elizabeth line has cut journey times to central London and Heathrow, lifting demand and values across W7. For a house project it improves the backdrop; your scheme is still governed by Permitted Development limits and Ealing householder policy, which we apply.
The Hanwell Village Green and Churchfields conservation areas protect the older village core and the streets around St Mary's, so external changes there need full planning with a Heritage Statement. We design sympathetically and submit to Ealing.
Usually yes on the semis and terraces — a hip-to-gable plus rear dormer within the volume allowance, confirmed by a Lawful Development Certificate, provided you're not in a conservation area. We check the constraints for your road and draw it for Building Control.
Ealing Council charges its own statutory application fee (currently £548 for a householder planning application, £610 for a full application). We quote the drawings as one fixed price and the free site survey covers every W7 address.
For a W7 project across Hanwell, Boston Manor fringe, Churchfields, West Ealing 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 Ealing Council (8 weeks for a householder application). We carry the Hanwell application through every officer query to the decision.
Hanwell (W7) sits primarily in Ealing, so applications are decided by Ealing Council. Conservation areas within W7 include Hanwell Village Green, Churchfields, St Mary's Hanwell, 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 Hanwell — 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 Ealing Council Building Control or an approved inspector. On W7'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. 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 W7 homes.
Planning history and precedent stop at the borough line, so the comparable approvals nearby may sit elsewhere. See all services in NW10, W3, W4, W5 and W13.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
Every W7 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. W7 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 |
|---|---|---|---|
| W7 | Hanwell | Edwardian villas, 1930s semi-detached | Hanwell sits wholly inside W7, so Ealing Council validates every mansard roof extension submitted from an W7 address. |
| W3 | Acton | Victorian and Edwardian terraces | Adjoining district to W7, also inside Ealing for mansard roof extension purposes. |
| W5 | Ealing | Edwardian villas, Victorian terraces | Adjoining district to W7, also inside Ealing for mansard roof extension purposes. |
| W13 | West Ealing | Edwardian terraces | Adjoining district to W7, also inside Ealing for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few W7 streets, and each one changes what a mansard roof extension can achieve at that address.
Conservation areas covering W7 (Hanwell): Ealing Council runs 30, and Pitshanger, Bedford Park, Acton Green are the ones W7 (Hanwell) owners meet most. A mansard roof extension inside a W7 (Hanwell) conservation area loses permitted development, so the W7 (Hanwell) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Hanwell a mansard roof extension is judged on the street elevation first.
W7 (Hanwell) and Article 4: Article 4 for HMOs in specific streets in Acton, Ealing and Southall. A mansard roof extension planned at a W7 address is checked against that direction first; Ealing Council publishes the W7 (Hanwell) extent, and the W7 line rarely follows the W7 (Hanwell) boundary you would expect.
What W7 (Hanwell) is built from: Victorian and Edwardian villas in Ealing central; 1930s semi-detached in Northolt and Hanwell; mansion blocks along main roads; Bedford Park is a listed Arts & Crafts garden suburb. Leafy outer-west London; Bedford Park conservation area has strict heritage controls; rest of borough generally permissive. That mix decides the mansard roof extension route in W7 (Hanwell) more than the postcode does, and it is what a Ealing Council case officer reads first. A householder application costs £548 paid to Ealing Council direct, with 8 weeks to a decision once validated.
Sources for this W7 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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