Lewisham's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Lewisham conservation areas — with heritage statements and planning officer negotiation built in.
Lewisham's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Lewisham conservation areas — with heritage statements and planning officer negotiation built in.
Housing stock in Lewisham: Victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill; 1930s semi-detached in Catford and Hither Green; post-war mixed in Deptford.
Character: Generally permissive planning compared to central boroughs; loft conversions and side-return extensions routinely approved under PD.
We check against Lewisham Council's mansard design guide and design to match the terrace.
Required for Lewisham's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Lewisham Council committee.
Mansards invariably trigger Party Wall notices in Lewisham's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Lewisham 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 Lewisham homeowners ask every week about mansard roof extensions.
Start a free quote →Mansards in Lewisham are less common historically — Lewisham 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 Lewisham 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. Lewisham Council's design guide (where published) takes precedence on detail.
Often yes, but Lewisham Council favours applications supported by wider street precedents. Where mansards already exist nearby in Lewisham, approval is far more likely. We review street precedents at the feasibility stage.
Our architectural fees for a Lewisham mansard start at £1,575 (planning + building regs + structural + heritage statement). Typical Lewisham 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 Lewisham's victorian and Edwardian terraces across Brockley, Honor Oak, Forest Hill terraced context.
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 Lewisham 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 {location} roof line — dormer, mansard, hip-to-gable, L-shape, Velux. LDC or full planning ...
From £1,225. The whole spectrum — rear extensions, side returns, wraparounds, double-storey, basement digs. Planning-led design with ...
From £995. Turn your unused {location} garage into a bedroom, home office or open-plan kitchen-diner. Planning route assessment, fu...
From £1,950. Full architectural technology service for basement digs and cellar conversions in {location} — structural underpinning d...
From £350. Chartered structural engineer calculations for every residential intervention in {location} — steel beams, lintels, pad ...
From £450. End-to-end Party Wall Act 1996 service for {location} — Section 1, 3 and 6 notices, schedule of condition surveys, party...
From £1,225. London's most popular loft type — the full-width rear dormer. Planning or Permitted Development route assessed for your ...
Free quote in 60 seconds. Fixed fee from £1,575. MCIAT chartered.
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