Hounslow's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Hounslow conservation areas — with heritage statements and planning officer negotiation built in.
Hounslow's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Hounslow conservation areas — with heritage statements and planning officer negotiation built in.
Housing stock in Hounslow: Edwardian villas in Chiswick and Turnham Green; Georgian in Isleworth; 1930s semi-detached in Hounslow and Feltham; riverside new-build in Brentford.
Character: Chiswick is one of west London's most conservation-controlled areas; outer Hounslow is permissive suburban.
We check against Hounslow Council's mansard design guide and design to match the terrace.
Required for Hounslow's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Hounslow Council committee.
Mansards invariably trigger Party Wall notices in Hounslow's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Hounslow Council planning officer, committee representation if called in.
Part L thermal, Part B fire (critical on mansards), Part E acoustic separation.
Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Direct answers to the questions Hounslow homeowners ask every week about mansard roof extensions.
Start a free quote →Mansards in Hounslow are less common historically — Hounslow Council considers each application on its merits. Rear mansards on suitable terraced or semi-detached properties, matching the roofscape, have a reasonable approval rate with the right design and supporting heritage commentary where relevant.
A 70° front slope is typical for Hounslow mansards — steep enough to maximise floor area while reading as a roof rather than a full additional storey. Front dormers should be small and symmetrical. Hounslow Council's design guide (where published) takes precedence on detail.
Often yes, but Hounslow Council favours applications supported by wider street precedents. Where mansards already exist nearby in Hounslow, approval is far more likely. We review street precedents at the feasibility stage.
Our architectural fees for a Hounslow mansard start at £1,575 (planning + building regs + structural + heritage statement). Typical Hounslow build costs are £90,000–£150,000 depending on size, complexity and access.
Full-height — typically 2.3–2.5m ceiling from the new floor. Unlike a dormer, which gives partial head height, a mansard provides a complete additional storey within Hounslow's edwardian villas in Chiswick and Turnham Green terraced context.
We cover all Hounslow postcodes — {postcodes} — and have submitted mansard applications across the borough. Our heritage statement and design-and-access statement are included in every mansard package.
Hounslow's edwardian villas in Chiswick and Turnham Green terraced stock is the natural context for mansard extensions — they were originally designed for Victorian and Edwardian rows. Feasibility depends on street precedent, conservation area status and party wall implications. We assess all three at the free site visit.
A mansard adds a full upper storey — typically 35–45m² of usable floor space. In Hounslow this often converts a 3-bed house to 4 or 5 beds. The steep front slope (70°) and flat top read as a roof, not a full floor, which is why Hounslow Council accepts them more readily than a simple box extension.
We cover every London borough with the same fixed-fee approach. If your property sits on a boundary, here are the neighbouring options.
We cover every architectural technology service in Hounslow with one chartered team.
From £840. A fixed-fee, end-to-end service — measured survey, scaled drawings, Design & Access Statement where required, Planning P...
From £840. A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L ther...
From £1,225. Every loft type across every Hounslow roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning ro...
From £1,225. The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with ...
From £995. Turn your unused Hounslow garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, full...
From £1,950. Full architectural technology service for basement digs and cellar conversions in Hounslow — structural underpinning des...
From £350. Chartered structural engineer calculations for every residential intervention in Hounslow — steel beams, lintels, pad fo...
From £540. Fixed-fee measured surveys across Hounslow from £540 — floor plans, elevations and sections to ±3mm accuracy. Leica Dist...
From £450. End-to-end Party Wall Act 1996 service for Hounslow — Section 1, 3 and 6 notices, schedule of condition surveys, party w...
From £1,225. London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your ...
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Free quote in 60 seconds. Fixed fee from £1,575. MCIAT chartered.
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