Richmond upon Thames's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Richmond upon Thames conservation areas — with heritage statements and planning officer negotiation built in.
Richmond upon Thames's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Richmond upon Thames conservation areas — with heritage statements and planning officer negotiation built in.
Housing stock in Richmond upon Thames: Georgian in Richmond Green and Twickenham; Edwardian villas in Barnes and East Sheen; 1930s semi-detached in Whitton; riverside cottages along the Thames.
Character: Highest conservation area coverage in London; Royal Parks and Thames corridor add heritage layers; design quality heavily scrutinised.
We check against Richmond Council's mansard design guide and design to match the terrace.
Required for Richmond upon Thames's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Richmond Council committee.
Mansards invariably trigger Party Wall notices in Richmond upon Thames's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Richmond 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 Richmond upon Thames homeowners ask every week about mansard roof extensions.
Start a free quote →Mansards in Richmond upon Thames are less common historically — Richmond 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 Richmond upon Thames 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. Richmond Council's design guide (where published) takes precedence on detail.
Often yes, but Richmond Council favours applications supported by wider street precedents. Where mansards already exist nearby in Richmond upon Thames, approval is far more likely. We review street precedents at the feasibility stage.
Our architectural fees for a Richmond upon Thames mansard start at £1,575 (planning + building regs + structural + heritage statement). Typical Richmond upon Thames 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 Richmond upon Thames's georgian in Richmond Green and Twickenham terraced context.
We cover all Richmond upon Thames postcodes — {postcodes} — and have submitted mansard applications across the borough. Our heritage statement and design-and-access statement are included in every mansard package.
Richmond upon Thames's georgian in Richmond Green and Twickenham 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 Richmond upon Thames 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 Richmond 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 Richmond upon Thames 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 Richmond upon Thames roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full...
From £1,225. The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with ...
From £995. Turn your unused Richmond upon Thames garage into a bedroom, home office or open-plan kitchen-diner. Planning route asse...
From £1,950. Full architectural technology service for basement digs and cellar conversions in Richmond upon Thames — structural unde...
From £350. Chartered structural engineer calculations for every residential intervention in Richmond upon Thames — steel beams, lin...
From £540. Fixed-fee measured surveys across Richmond upon Thames from £540 — floor plans, elevations and sections to ±3mm accuracy...
From £450. End-to-end Party Wall Act 1996 service for Richmond upon Thames — Section 1, 3 and 6 notices, schedule of condition surv...
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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