A new floor for your home, without moving
From a simple Velux conversion to a full mansard, we handle drawings, approvals and the build across East London, Essex and London.
The right conversion depends on your roof
Not sure which one fits? We'll tell you at the free survey.
Velux (rooflight)
Roof windows set into the existing slope. The quickest and lowest-cost option where there's already good head height.
Best for: roofs with plenty of height From £25,000 + VAT
Rear dormer
Most popularA box-shaped extension off the rear slope that adds full head height. Room for a double bedroom and en-suite.
Best for: terraces and semis From £42,000 + VAT
Hip-to-gable
The sloping side of the roof is built up into a vertical gable wall, often combined with a rear dormer for maximum space.
Best for: semis, detached and end-of-terrace From £50,000 + VAT
Mansard
The roof is rebuilt with steep sides and a flat top, effectively a whole new storey. Usually needs planning permission.
Best for: period terraces, conservation areas From £72,000 + VATOne price, start to finish
- Architectural drawings
- Structural engineer's calculations
- Planning or permitted-development check
- Building control application and sign-off
- Scaffolding and waste removal
- Steel beams and new floor joists
- Insulation to current regulations
- New staircase and fire doors
- Windows and roof lights
- Electrics, heating and plumbing first fix
- Plastering, ready to decorate
- Building control completion certificate
Three quick checks
Head height
Measure from the top of a ceiling joist to the underside of the ridge. Around 2.2 m or more is a good sign. Less can often be solved with a dormer or mansard.
Roof structure
Traditional rafters are simpler to convert. Modern trussed roofs can still be done, but need extra steelwork.
Planning
Many lofts in England fall under permitted development. Flats, conservation areas and mansards usually need planning permission. We check this for you.
How long it takes
See what your loft could cost
An indicative price in 2 minutes, then a fixed quote after a free survey.