Greenwich's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Greenwich conservation areas — with heritage statements and planning officer negotiation built in.
Mansard roof extensions in Greenwich, a borough of Georgian in Greenwich town centre; Victorian terraces in East Greenwich, are the full measured-survey-to-submission drawing set Royal Borough of Greenwich needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.
Greenwich's most space-efficient loft solution when PD-route dormers are blocked. Our chartered team designs mansards that get approved in Greenwich conservation areas — with heritage statements and planning officer negotiation built in.
Housing stock in Greenwich: Georgian in Greenwich town centre; Victorian terraces in East Greenwich, Charlton; inter-war semi-detached in Eltham; new-build along the riverside.
Character: World Heritage Site status in Greenwich town centre adds heritage weight; outer borough areas (Eltham, Thamesmead) generally permissive.
We check against Greenwich Council's mansard design guide and design to match the terrace.
Required for Greenwich's conservation areas — demonstrates the mansard respects character and townscape.
Accurate photomontage showing how the mansard sits alongside neighbours — often decisive at Greenwich Council committee.
Mansards invariably trigger Party Wall notices in Greenwich's dense terraced streets. Structural package includes new ridge, tie beams, floor joists.
Full liaison with Greenwich 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.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Every Greenwich postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. Greenwich 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 |
|---|---|---|---|
| SE2 | Abbey Wood | Georgian in Greenwich town centre; Victorian terraces in East Greenwich | Abbey Wood is split at SE2. Either Greenwich Council or Bexley Council can determine a mansard roof extension here, so the SE2 address is checked against both policies maps first. |
| SE3 | Blackheath / Kidbrooke | Georgian villas, Victorian terraces | Blackheath / Kidbrooke is split at SE3. Either Greenwich Council or Lewisham Council can determine a mansard roof extension here, so the SE3 address is checked against both policies maps first. |
| SE7 | Charlton | Victorian villas, 1930s semi-detached | SE7 covers Charlton only; Greenwich Council handles the mansard roof extension, and Charlton case officers apply the SE7 conservation-area map. |
| SE9 | Eltham / Mottingham | 1930s semi-detached, post-war flats | Eltham / Mottingham is split at SE9. Either Greenwich Council or Bromley Council can determine a mansard roof extension here, so the SE9 address is checked against both policies maps first. |
| SE10 | Greenwich | Georgian terraces, listed buildings | Greenwich sits wholly inside SE10, so Greenwich Council validates every mansard roof extension submitted from an SE10 address. |
| SE18 | Woolwich / Plumstead | Georgian fragments, post-war estates, new-build | SE18 covers Woolwich / Plumstead only; Greenwich Council handles the mansard roof extension, and Woolwich / Plumstead case officers apply the SE18 conservation-area map. |
| SE28 | Thamesmead | Post-war estates, new-build | SE28 covers Thamesmead only; Greenwich Council handles the mansard roof extension, and Thamesmead case officers apply the SE28 conservation-area map. |
Roof pitch, wall build-up and plot depth change every few Greenwich streets, and each one changes what a mansard roof extension can achieve at that address.
Conservation areas covering Greenwich: Greenwich Council runs 20, and Blackheath, Charlton, Eltham Park are the ones Greenwich owners meet most. A mansard roof extension inside a Greenwich conservation area loses permitted development, so the Greenwich submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Charlton a mansard roof extension is judged on the street elevation first.
No blanket Article 4 over Greenwich: Greenwich Council has not withdrawn permitted development across Greenwich, so a mansard roof extension outside a Greenwich conservation area usually keeps it. The £274 Lawful Development Certificate is still the document a SE2 owner wants on file.
Greenwich housing stock: Georgian in Greenwich town centre; Victorian terraces in East Greenwich, Charlton; inter-war semi-detached in Eltham; new-build along the riverside. World Heritage Site status in Greenwich town centre adds heritage weight; outer borough areas (Eltham, Thamesmead) generally permissive. Read that before choosing a mansard roof extension route in Greenwich — construction, not postcode, sets what is achievable. Greenwich Council charges £548 for a householder application and has 8 weeks to determine it.
Sources for this Greenwich 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.
Direct answers to the questions Greenwich homeowners ask every week about mansard roof extensions.
Start a free quote →Mansards in Greenwich are less common historically — Greenwich 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 Greenwich 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. Greenwich Council's design guide (where published) takes precedence on detail.
Often yes, but Greenwich Council favours applications supported by wider street precedents. Where mansards already exist nearby in Greenwich, approval is far more likely. We review street precedents at the feasibility stage.
A Greenwich mansard carries more design work than a dormer — heritage statement, street-elevation massing and conservation-led detailing on top of planning, building regulations and structural calculations. Build cost then varies with size, roof geometry and site access. Our design fee is fixed before we start; see our fees.
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 Greenwich's georgian in Greenwich town centre terraced context.
We cover all Greenwich postcodes — SE3, SE7, SE9, SE10, SE18, SE28 — and have submitted mansard applications across the borough. Our heritage statement and design-and-access statement are included in every mansard package.
Greenwich's georgian in Greenwich town centre 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 Greenwich 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 Greenwich Council accepts them more readily than a simple box extension.
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