Mansard Loft Conversions
The mansard is the maximal conversion: the roof slope is rebuilt at a near-vertical angle across the full width of the house, creating the biggest and most room-like space a loft can give.
Where a dormer adds a box, a mansard re-imagines the roof — a steep 72° face, usually to the rear, with windows built in as dormers. The result reads as a proper storey: flat ceilings, full-height walls, space for two rooms on wider houses.
Because the roof profile changes so much, mansards almost always need planning permission, and they reward houses where the extra investment matches the street — Redland, Clifton, Southville terraces among them. We handle the structural rebuild, and the design is prepared with our partner architects where drawings are needed.
- Best for
- Maximum space on terraces
- Planning
- Almost always required
- On site
- 10–14 weeks
- Guide price
- from £50,000 + VAT
More loft conversions routes
Ready to talk about a mansard?
A visit costs nothing and commits you to nothing. We'll look at what your house can take, give you straight answers, and tell you plainly if the numbers don't stack up.
- You tell us the ideaThree quick questions — no essay required.
- We call within a working dayA real conversation about what your house can take.
- A visit, then an itemised quoteEvery line written down, and only if you want one.
- On site
- Mon–Fri, 8am–5pm
- Office calls
- until 6pm weekdays
- We reply
- within one working day