Mansard Roof Extensions · SE10 Greenwich
Fixed-fee mansard roof extensions for Greenwich, West Greenwich, Maze Hill, Greenwich Peninsula in the SE10 postcode, drawn by an MCIAT-chartered architectural technologist and submitted to Greenwich Council. SE10 includes the Greenwich Maritime World Heritage Site setting; Greenwich applies the strictest control near the park and West Greenwich.
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 SE10's terraces in Greenwich where a standard dormer is too small. Greenwich Council scrutinises mansards on townscape and precedent, especially within Greenwich Park, West Greenwich, Ashburnham Triangle; we design to the borough's roof guidance with a Heritage Statement where the setting requires it.
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.
Across Greenwich, West Greenwich, Maze Hill, Greenwich Peninsula in SE10, the dominant property is georgian and victorian terraces around greenwich town and the park, with riverside new-build on the peninsula and conservation-area houses on the hill. 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 Greenwich Council judges each on design quality and neighbour impact. We survey the specific Greenwich property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the SE10 streetscape.
Housing stock in SE10: Georgian and Victorian terraces around Greenwich town and the park, with riverside new-build on the Peninsula and conservation-area houses on the hill.
Within the district: Greenwich, West Greenwich, Maze Hill, Greenwich Peninsula.
Streets we know in SE10: the West Greenwich streets (Royal Hill, Gloucester Circus), the Maze Hill terraces and Croom's Hill. Each road has its own building line, boundary treatment and precedent that Greenwich Council weighs when assessing a mansard roof extensions scheme.
Conservation areas: Greenwich Park, West Greenwich, Ashburnham Triangle. Inside these, most external work needs full planning and a Heritage Statement.
Getting around SE10: Greenwich and Maze Hill rail and DLR, plus North Greenwich on the Jubilee line and the riverbus.
Regeneration: Greenwich falls within or beside the Greenwich Peninsula (one of Europe's largest regeneration schemes), which shapes local planning policy and design expectations.
Property values: around £450,000 for a flat and £850,000-£1.4m for a house — a useful gauge of the build value an extension or loft adds in SE10.
Borough 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 building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
Heavily. West Greenwich and the area around Greenwich Park sit within the setting of the Maritime Greenwich World Heritage Site, with conservation areas and many listed houses, so external changes need full planning, often Listed Building Consent, with detailed heritage scrutiny. We design to that standard and produce the documentation required.
Yes, but most of these streets are in conservation areas, so rear and side extensions and any roof change need full planning with a Heritage Statement rather than Permitted Development. We design to match the Georgian and Victorian detailing and submit to Greenwich, carrying the application through officer queries.
The Peninsula is one of Europe's largest regeneration schemes — thousands of homes around the O2 and North Greenwich — lifting values across SE10. For a conservation-area house project, though, the binding controls remain the World Heritage setting and the local designation, which we work within.
The Ashburnham Triangle is a conservation area of attractive Victorian terraces where side-return and rear extensions are common but assessed on materials and form. We design sympathetically and submit a full application with a Heritage Statement, handling the planning and Building Regulations drawings together.
Our fixed fee for mansard roof extensions in Greenwich starts at £1,575 — no hourly billing. With Greenwich property at around £450,000 for a flat and £850,000-£1.4m for a house, the professional drawing fee is a small fraction of the value the work adds to SE10's georgian and victorian terraces around greenwich town. Greenwich 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 SE10 address.
For a SE10 project across Greenwich, West Greenwich, Maze Hill, Greenwich Peninsula, 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 Greenwich Council (8 weeks for a householder application). We carry the Greenwich application through every officer query to the decision.
Greenwich (SE10) sits primarily in Greenwich, so applications are decided by Greenwich Council. Article 4 in force in the borough: No. Conservation areas within SE10 include Greenwich Park, West Greenwich, Ashburnham Triangle, 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 Greenwich — 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 Greenwich Council Building Control or an approved inspector. On SE10'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 Greenwich (SE10) property at around £450,000 for a flat and £850,000-£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 SE10 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 SE10 postcode district we draw in, the stock that dominates it and the authority that validates a mansard roof extension there. SE10 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 |
|---|---|---|---|
| SE10 | Greenwich | Georgian terraces, listed buildings | Greenwich sits wholly inside SE10, so Greenwich Council validates every mansard roof extension submitted from an SE10 address. |
| SE2 | Abbey Wood | mixed stock | Adjoining district to SE10, also inside Greenwich for mansard roof extension purposes. |
| SE3 | Blackheath / Kidbrooke | Georgian villas, Victorian terraces | Adjoining district to SE10, also inside Greenwich for mansard roof extension purposes. |
| SE7 | Charlton | Victorian villas, 1930s semi-detached | Adjoining district to SE10, also inside Greenwich for mansard roof extension purposes. |
| SE9 | Eltham / Mottingham | 1930s semi-detached, post-war flats | Adjoining district to SE10, also inside Greenwich for mansard roof extension purposes. |
Roof pitch, wall build-up and plot depth change every few SE10 streets, and each one changes what a mansard roof extension can achieve at that address.
How designation changes a SE10 (Greenwich) mansard roof extension: Greenwich Council maintains 20 conservation areas, including Charlton, Eltham Park, Greenwich Town Centre (World Heritage Site). Inside any of them a SE10 (Greenwich) 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. Eltham Park sets the tone for SE10 (Greenwich) casework.
SE10 (Greenwich) permitted development status: there is no borough-wide direction from Greenwich Council, so a mansard roof extension at a SE10 address is normally still permitted development. We certify that with a £129 Lawful Development Certificate rather than leaving a SE10 (Greenwich) sale to argue it later.
The building fabric around SE10 (Greenwich): 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. A mansard roof extension in SE10 (Greenwich) is scoped against that stock first. Our SE10 (Greenwich) fixed fee starts at £1,575; the £1,750 Complete package runs the SE10 (Greenwich) scheme through Greenwich Council planning and building control in one go.
Sources for this SE10 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.
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