The most popular loft conversion type — a box-shaped extension to the roof creating a full-height room with vertical walls and windows. Compare up to 3 free quotes — no obligation.
A dormer loft conversion adds a box-shaped structure to your existing roof slope, creating a room with full-height walls and significantly more usable floor space than a Velux conversion. Rear dormers are the most common and typically fall within Permitted Development rights — no planning permission required for most properties.
The resulting space is ideal for a master bedroom with en-suite, a home office, or a children's bedroom. Getting 3 quotes from experienced loft conversion specialists ensures you understand the true cost and what each quote includes.
Typical cost: basic rear dormer £25,000–£35,000. Dormer with en-suite £35,000–£50,000. Full-width rear dormer £40,000–£60,000.
Prices vary by region, subfloor condition and product choice. Compare 3 quotes for the most accurate price for your specific job.
“We had a rear dormer conversion done last summer — extra bedroom and en-suite for our teenage daughter. Got three quotes through this site, saved around £4,000 compared to the first firm we spoke to. The specialist handled planning permission and building regs start to finish. Highly recommend.”
“Hip-to-gable conversion on our 1930s semi. I was nervous about the planning application but the specialist I found here had done dozens in our street and knew exactly what to submit. Project came in on time at 10 weeks. The new master bedroom is brilliant.”
“L-shaped dormer on our Victorian terrace — created two rooms and a bathroom from what was a completely unusable loft. The comparison process gave me confidence I was paying a fair price. Building control sign-off came through with no issues. Absolutely transformed the house.”