Mansard Loft Conversion Drawings in Greenwich SE10
Fixed-fee, MCIAT-chartered mansard loft conversion drawings for Greenwich (SE10) homeowners — Royal Borough of Greenwich validation and local constraints handled from the start.
Greenwich (SE10) is among the most heritage-sensitive places to build in London: most of its period housing sits within one of the Royal Borough's conservation areas — West Greenwich, Greenwich Park, East Greenwich or the Ashburnham Triangle — and three of those carry Article 4 directions that pull nearly all external work into the planning system. Side-return and rear extensions on the Victorian and Georgian terraces are the staple, but they are judged carefully on materials, proportion and detail.
SE10 also sits within, or beside, the Maritime Greenwich World Heritage Site: the inscribed core is the Old Royal Naval College, Queen's House, Royal Observatory and Cutty Sark, with the surrounding streets in the buffer zone. That means townscape and setting weigh heavily on how schemes are assessed. We check exactly which conservation area — and which Article 4 direction — applies to a Greenwich address before advising on a permitted-development or full-application route.
Planning in Greenwich (SE10): what to know before you apply
Most SE10 houses fall inside the West Greenwich, Greenwich Park, East Greenwich or Ashburnham Triangle conservation areas, and the first three carry Article 4 directions removing permitted-development rights for re-roofing, windows, doors and other external changes. The Maritime Greenwich World Heritage Site and its buffer zone add further townscape scrutiny. We confirm the conservation area and Article 4 status for a specific property before recommending a route and drawing to the Royal Borough's guidance.
Typical Greenwich housing stock
Georgian and early-Victorian terraces around Royal Hill and Crooms Hill, the Victorian terraces of the Ashburnham Triangle, and the streets of West and East Greenwich framing the town centre and Greenwich Park.
Streets we regularly draw for in Greenwich
Royal Hill · Crooms Hill · Ashburnham Grove · Gloucester Circus
Mansard Loft Conversion Drawings for Greenwich (SE10) homes: the package and the process
Every mansard loft conversion drawings we prepare for an Greenwich property is drawn to Royal Borough of Greenwich’s validation standards and tuned to the SE10 constraints above. Here is what the drawing package covers and how the process runs from first survey to approval.
A mansard loft conversion replaces the existing rear roof slope with a new, steeply pitched structure that runs almost to the vertical, set behind a shallow flat section at the ridge. It is the most involved of the three main loft types because it is effectively a new roof, not an addition to the old one — but it also delivers the most usable floor area and headroom, and it is the type most London terraces were designed to carry in the first place.
DrawingsDirect draws mansards for period terraces across every London borough. Because a mansard alters the whole roof form, we treat the planning application as the main event — matching slate or tile colour, window rhythm and eaves detailing to the host building and its neighbours — while coordinating the structural design, Party Wall Act notices and building regulations drawings in parallel so nothing holds up the build once consent is granted.
What is a mansard loft conversion?
A mansard replaces the rear roof slope — or, less commonly, the front and rear slopes together — with a new near-vertical wall rising from the party walls to a shallow flat roof at the ridge, with small dormer windows set into it. Unlike a dormer, which sits within the existing roof, a mansard changes the shape of the roof itself, which is why it is usually reserved for terraces where the extra headroom and floor area are worth the more involved planning and construction process. Because the new wall runs almost the full width of the house between the party walls, a mansard typically delivers noticeably more usable floor area than a single dormer of any kind, which is why it remains the preferred option on period terraces where every square metre of loft counts.
Does a mansard loft conversion need planning permission in London?
Yes, almost always. Permitted development rights for roof alterations are volume- and shape-limited, and a mansard goes well beyond what those limits allow because it materially alters the roof's profile rather than adding to it. Every mansard we draw is prepared as a full householder planning application, with a design and access statement where the borough requires one, so the council can properly assess the change to the roofline and its impact on neighbours and the street scene.
| Package | Scope | Planning route | Fee from |
|---|---|---|---|
| Rear mansard, planning only | Design, planning drawings and supporting statement | Householder planning | £1,600 |
| Rear mansard, planning and building regs | Planning drawings plus structural and Part L detailing | Householder planning | £2,200 |
| Front and rear mansard | Full roof rebuild on both slopes, with structural | Householder planning | £2,400 |
Mansard Loft Conversion Drawings in Greenwich SE10 — FAQs
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