A dormer loft conversion is the most popular type of loft conversion in Bristol. A box-shaped extension is built out from the roof slope, usually at the back of the house, giving you full standing height and extra floor space you simply don’t get from roof windows alone.
At ST Lofts, dormer conversions start from around £40,300. The price for your home depends mostly on the size of the loft, and you can get an instant figure for your own home with our loft conversion cost calculator.
The cost calculator gives you a guide price in minutes. For an exact price, book a free survey. We’ll come out, look at your loft, talk through what you’d like and then send you a full, itemised quote.
There’s no obligation, and if you’d rather talk it through first, give us a call or send us a WhatsApp.
Our dormer price covers the whole build. That typically includes opening up the roof and building the dormer, new structural floor joists and steel beams where needed, roofing and cladding to the dormer, windows, insulation, a new staircase, electrics, plastering and building control sign-off.
Most dormer conversions take around eight to ten weeks on site, and we manage every stage with our own team.
The main things that affect the cost of a dormer conversion are:
A dormer is a great fit if your loft is a little short on head height, or if you want a proper full-height room such as a double bedroom with a shower room. It suits most Bristol terraces and semi-detached houses.
Rear dormers often fall under permitted development, so many don’t need planning permission, although homes in conservation areas such as Clifton, Cotham and Redland usually do. Our guide to loft conversions by Bristol house type explains which conversions suit which homes.
Velux Loft Conversion Cost
From around £30,000
Hip to Gable Loft Conversion Cost
From around £42,000
L Shaped Loft Conversion Cost
From around £39,600
Mansard Loft Conversion Cost
From around £37,400
Not sure which type suits your home? Our cost calculator lets you compare all five side by side.
Our free online calculator gives you an instant price for a dormer loft conversion based on the size of your loft, with options for an en-suite, extra windows and more.
When you’re ready, we’ll arrange a free, no-obligation survey and give you a full, itemised quote.
Common questions about the cost of a dormer loft conversion.
Dormer conversions with ST Lofts start from around £40,300. The final price depends on the size of your loft and dormer, the roof structure and extras like an en-suite. Use our cost calculator for an instant price for your loft.
A dormer involves building a new section of roof, with extra structural work, roofing and cladding. In return, you get much more head height and usable floor space.
Many rear dormers fall under permitted development, so they don’t need full planning permission. Dormers in conservation areas or on the front of the house usually do. Building regulations approval is always needed.
Most dormer conversions take around eight to ten weeks on site. See our loft conversion timeline for a week-by-week breakdown.
