Every roof is different, so the honest answer is that it depends. Here is an indicative guide by conversion type, and an estimator to get you into the right ballpark.
We tell you what your roof allows and give you a fixed price, in one visit.
Book your free survey Call free, Mon to Sat 0800 028 0099The biggest factor is the type of conversion. A Velux, where the head height already exists, is the most affordable because there is no structural change to the roof. A dormer or hip to gable costs more because it adds real floor space, and an L-shape sits at the top because it adds the most.
On top of the type, the cost moves with the size of the space, the roof structure, whether you need planning permission, and the specification you choose for the bathroom, joinery and finishes.
We never leave you guessing. After a free design survey we give you one fixed written price for your home, with no hidden extras, and staged payments through the build so you are never out of pocket up front. The figure you sign is the figure you pay. See how payments work →
Pick a conversion type for an indicative range. Your exact fixed price is confirmed free, on a survey.
An indicative market guide only, not a quote. The cost depends on your roof, the type of conversion, the spec and the finish. After a free survey we give you one fixed written price, with no hidden extras.
Book a free, no-obligation design visit. We will tell you what your roof allows, show you what it could look like, and give you a fixed price. No pressure, no jargon.
A short conversation about the house and what you are hoping to do. No sales pitch.
We measure up and tell you honestly what your roof allows, what it would look like, and what it involves.
Itemised, with no hidden extras, and a ten-year written guarantee on the finished work.
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