Mansard Roof Extensions · W5 Ealing
Fixed-fee mansard roof extensions for Ealing, Ealing Broadway, Pitshanger, Montpelier in the W5 postcode, drawn by an MCIAT-chartered architectural technologist and submitted to Ealing Council. Ealing applies conservation control across several W5 villa suburbs; the large plots make rear and side extensions a strong local market.
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 W5's terraces in Ealing where a standard dormer is too small. Ealing Council scrutinises mansards on townscape and precedent, especially within Ealing Green, Montpelier, Pitshanger, Mount Park; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
Ealing's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Ealing conservation areas — with heritage statements and planning officer negotiation built in.
Across Ealing, Ealing Broadway, Pitshanger, Montpelier in W5, the dominant property is substantial edwardian and victorian villas and semis, inter-war housing and mansion blocks across ealing, 'queen of the suburbs'. 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 Ealing property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the W5 streetscape.
Housing stock in W5: Substantial Edwardian and Victorian villas and semis, inter-war housing and mansion blocks across Ealing, 'Queen of the Suburbs'.
Within the district: Ealing, Ealing Broadway, Pitshanger, Montpelier.
Streets we know in W5: the Pitshanger and Montpelier roads, Mount Park Road, Castlebar Road and Hamilton Road. Each road has its own building line, boundary treatment and precedent that Ealing Council weighs when assessing a mansard roof extensions scheme.
Conservation areas: Ealing Green, Montpelier, Pitshanger, Mount Park. Inside these, most external work needs full planning and a Heritage Statement.
Getting around W5: Ealing Broadway on the Central, District and Elizabeth lines, plus Ealing rail.
Regeneration: Ealing falls within or beside the Ealing Broadway / Elizabeth line growth area, which shapes local planning policy and design expectations.
Property values: around £450,000 for a flat and £900,000-£1.4m for a house — a useful gauge of the build value an extension or loft adds in W5.
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 Ealing'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 Ealing'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.
Because W5 is full of substantial Edwardian and Victorian villas and semis on generous plots around Pitshanger and Montpelier — ideal for rear, side and double-storey extensions and large loft conversions as families grow. We've drawn the full range here to Ealing's standards, on both Permitted Development and full-planning routes.
Ealing Broadway on the Elizabeth line has cut journey times across London, reinforcing W5's status as a premium family suburb and supporting values. For a house project the binding controls remain Permitted Development limits and the local conservation designation, which we check for your road.
Often, yes. The larger semis and detached houses around Mount Park Road and Castlebar Road have the plot and separation for a two-storey side or rear extension, subject to Ealing's design and neighbour-amenity policy. We design within those limits and draw the scheme for planning and Building Control.
Ealing Green, Montpelier, Pitshanger and Mount Park all carry conservation designations within W5, controlling materials, bays and roofscape. We check your exact address, because it determines whether you need full planning and a Heritage Statement rather than a Lawful Development Certificate.
Our fixed fee for mansard roof extensions in Ealing starts at £1,575 — no hourly billing. With Ealing property at around £450,000 for a flat and £900,000-£1.4m for a house, the professional drawing fee is a small fraction of the value the work adds to W5's substantial edwardian and victorian villas and semis. Ealing 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 W5 address.
For a W5 project across Ealing, Ealing Broadway, Pitshanger, Montpelier, 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 Ealing application through every officer query to the decision.
Ealing (W5) sits primarily in Ealing, so applications are decided by Ealing Council. Article 4 in force in the borough: Yes. Conservation areas within W5 include Ealing Green, Montpelier, Pitshanger, Mount Park, 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 Ealing — 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 W5'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 Ealing (W5) property at around £450,000 for a flat and £900,000-£1.4m 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 W5 homes.
From £840.
From £840.
From £1,225.
From £1,225.
From £995.
From £1,950.
From £350.
From £540.
From £450.
From £1,225.
Pick a slot that suits you. No obligation and no sales pressure — just straight answers on your planning route, fixed fee and timescale.
Every W5 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. W5 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 |
|---|---|---|---|
| W5 | Ealing | Edwardian villas, Victorian terraces | W5 covers Ealing only; Ealing Council handles the mansard roof extension, and Ealing case officers apply the W5 conservation-area map. |
| W5 | Ealing Broadway | Edwardian villas, Victorian terraces | Ealing Broadway sits inside W5; mansard roof extension proposals here are determined by Ealing Council. |
| W5 | Pitshanger | Edwardian villas | Pitshanger sits inside W5; mansard roof extension proposals here are determined by Ealing Council. |
| W3 | Acton | Victorian and Edwardian terraces | Adjoining district to W5, also inside Ealing for mansard roof extension purposes. |
| W7 | Hanwell | Edwardian villas, 1930s semi-detached | Adjoining district to W5, also inside Ealing for mansard roof extension purposes. |
| W13 | West Ealing | Edwardian terraces | Adjoining district to W5, also inside Ealing for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few W5 streets, and each one changes what a mansard roof extension can achieve at that address.
How designation changes a W5 (Ealing) mansard roof extension: Ealing Council maintains 30 conservation areas, including Pitshanger, Bedford Park, Acton Green. Inside any of them a W5 (Ealing) mansard roof extension cannot rely on permitted development, and the route becomes a £258 householder application determined in 8 weeks rather than a £120 prior approval in 6 weeks. Ealing Broadway sets the tone for W5 (Ealing) casework.
What Article 4 removes near W5 (Ealing): Article 4 for HMOs in specific streets in Acton, Ealing and Southall. Before pricing a mansard roof extension we check whether the W5 address is inside the mapped area, because Ealing Council draws the W5 (Ealing) boundary street by street rather than across the whole of W5 (Ealing).
What W5 (Ealing) 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 W5 (Ealing) more than the postcode does. Our fixed fee for mansard roof extensions in W5 (Ealing) starts at £1,575, against £1,750 for the Complete package that carries a W5 (Ealing) scheme through Ealing Council planning and building regulations together.
Sources for this W5 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.
Free fixed quote in 60 seconds. From £1,575. MCIAT chartered.
Get my free quote →Or contact us about your project firstBefore you commit, it is worth understanding transparent fixed fees and seeing our 98% approval record. You can search by service or borough to find the right fit, or create a free account to track your project. When you are ready, get a quote in minutes — most homeowners have a fee in minutes — or contact us for a chat and a chartered technologist will be in touch.
