The prefab dormer — new to the UK
An extra bedroom, installed by crane in one day.
A traditional dormer means scaffolding and a leaking tarp for 6–8 weeks. Ours is precision-built in our Dutch factory — window, insulation and cladding already fitted — then lifted onto your roof and made weathertight the same day. Fixed price from £22,500 inc. VAT.
- Weathertight on day one — no tarpaulins over your bedroom
- Fixed price, in writing, VAT included
- Rear dormers usually need no planning permission
- 10-year structural guarantee, building regs sign-off included
Why nobody in the UK does it this way (yet)
In the Netherlands, prefab dormers are the normal way to add a room — tens of thousands are craned onto Dutch terraced houses every year, houses built exactly like yours. We've brought that factory, that engineering and that speed to the UK. Traditional dormer: 6–8 weeks of scaffolding, £18,000–£28,000, and weather risk the whole way. Ours: built indoors, installed in a day, finished in days — at a comparable price.
How it works
- 1
Free survey
Photos and measurements — often no site visit needed to quote. Free permitted-development check for your address.
- 2
Fixed quote & design
Window layout, cladding, finish — one fixed price in writing.
- 3
Factory build
Your dormer is built complete: insulated, glazed, clad and finished inside.
- 4
Installed by crane in one day
We open the roof in the morning; by evening your dormer is on, watertight and warm. Finishing takes days, not weeks.
Get your free quote
Postcode + a few details — your price and permitted-development check within 48 hours.
Questions Brits ask us
Do I need planning permission?
Rear dormers usually don't: they fall under permitted development within the 40 m³ (terraced) or 50 m³ (semi/detached) roof-volume allowance. We check your address free and can arrange a Lawful Development Certificate for extra peace of mind.
How fast is it really?
The dormer itself is built in our factory in advance. On installation day the crane lifts it onto your prepared roof — your home is weathertight the same day, and we finish within days, not the 6–8 weeks a traditional dormer takes.
Will it match my roof?
You choose the cladding and window layout; we build to measure from a survey of your roof. Materials are selected to sit naturally alongside UK roofs.
What does 'from £22,500' include?
The complete rear dormer: structure, insulation, window, cladding, interior finish and installation, VAT included. A full dormer loft conversion (stairs, bedroom fit-out) is quoted per project.
What about building regulations?
Included — our installation is signed off under UK building regs, and the structure carries our 10-year guarantee.
Which areas do you cover?
We're rolling out across England now. Leave your postcode and we'll confirm your area within 48 hours.