Loft conversion types
The shape of your roof narrows it down fast. Here is what each type is, who it suits, and a guide price for a 3-bed semi with a standard finish and no bathroom (+ VAT).
Roof lights in the existing slope. The simplest conversion — keeps your roofline and is usually permitted development.
Suits: Best for gable roofs with good head height
From £25,000 + VAT Price this type Most popularA box extension off the back of the roof. The most head height and floor space for the money, and the one most people choose.
Suits: Terraced and semi-detached homes
From £28,000 + VAT Price this typeSquares off the sloping end of a hipped roof into a vertical gable wall, then adds roof lights.
Suits: Semis and detached homes with hipped roofs
From £32,500 + VAT Price this typeSquares off the end and boxes out the back. A big double bedroom with an en-suite is the usual result.
Suits: Hipped-roof semis wanting the most space
From £35,500 + VAT Price this typeTwo dormers wrapping over the main roof and the rear addition. The largest floor area without touching the roof shape.
Suits: Victorian and Edwardian terraces with a back addition
From £38,000 + VAT Price this typeSquares off the hipped end, then wraps an L-shaped dormer over the main roof and the rear addition. The biggest loft we build.
Suits: Hipped-roof homes with a back addition
From £45,500 + VAT Price this typeNot sure which roof you have?
Hipped roofs slope on three or four sides. Gable roofs slope on two sides, with a flat, vertical wall at each end. A hipped roof needs a hip-to-gable first, which is why its conversions are priced separately. If you're looking at your house from the street and can't tell, the calculator has an “I'm not sure” option and our surveyor confirms it in person.
The one measurement that matters most is head height: we need 2.25m from the top of the ceiling joists to the underside of the ridge. Most homes built before the 1960s have it comfortably.
Every type, same base spec
Seven quick questions. A real fixed-price figure. No email needed to see it.