House Extensions · W7 Hanwell
Ealing controls the Hanwell Village Green and Churchfields conservation areas; the Elizabeth line has lifted demand across W7.
This page covers one part of the borough. For the full picture — fees, timelines and the council's current position — read house extensions in Ealing.
House extensions in Hanwell are dominated by single-storey rear and side-return additions on W7's edwardian and inter-war terraces and semis around, with double-storey and wrap-around schemes where the plot allows. Ealing Council weighs depth, height and neighbour daylight; many extensions across Hanwell, Boston Manor fringe, Churchfields, West Ealing fringe are Permitted Development, which we confirm with a Lawful Development Certificate before you build.
The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with detailed technical phase, ideal for edwardian and inter-war terraces and semis around typical of Hanwell.
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 house extension drawings 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 house extension drawings 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: a W7 house and a W7 flat are not the same purchase. Ealing's 2025 flat and maisonette median was £420,000 across 1,409 sales, while detached houses reached £1,458,750 on 98. The district's combined midpoint, from 255 sales, was £550,000. Contains HM Land Registry data (c) Crown copyright and database right 2026
Borough character: Leafy outer-west London; Bedford Park conservation area has strict heritage controls; rest of borough generally permissive.
Measured existing survey, photographic record, Article 4 and conservation check specific to Hanwell before we quote.
2–3 design options at concept stage — alternative layouts, glazing, roof forms.
Site location plan, existing and proposed plans, elevations, sections, D&AS where required.
Part L thermal, Part B fire, Part M accessibility, structural strategy.
Steel beam, foundation, lintel design. Chartered engineer sign-off.
Party Wall notices where needed; Thames Water Build Over Agreement where within 3m of a public sewer.
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 house extension drawings 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 house extension there. W7 fees below are the statutory England rates for 2026, not house extension estimates.
| Postcode | Area | Dominant stock | What it means for a house extension |
|---|---|---|---|
| W7 | Hanwell | Edwardian villas, 1930s semi-detached | Hanwell sits wholly inside W7, so Ealing Council validates every house extension submitted from an W7 address. |
| W3 | Acton | Victorian and Edwardian terraces | Adjoining district to W7, also inside Ealing for house extension purposes. |
| W5 | Ealing | Edwardian villas, Victorian terraces | Adjoining district to W7, also inside Ealing for house extension purposes. |
| W13 | West Ealing | Edwardian terraces | Adjoining district to W7, also inside Ealing for house extension purposes. |
Roof pitch, wall build-up and plot depth change every few W7 streets, and each one changes what a house extension can achieve at that address.
W7 (Hanwell) conservation designations: there are 30 across Ealing Council, Acton Green, Hanwell, Ealing Broadway among them. Designation costs a W7 (Hanwell) owner the permitted-development route: a house extension then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Acton Green is the W7 (Hanwell) designation that most often changes a house extension design.
W7 (Hanwell) and Article 4: Article 4 for HMOs in specific streets in Acton, Ealing and Southall. A house 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.
The building fabric around W7 (Hanwell): 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. A house extension in W7 (Hanwell) 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 Ealing Council.
Sources for this W7 house 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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