Two connected dormers forming an L-shape — ideal for Victorian terraces to create two loft rooms. Compare up to 3 free quotes — no obligation.
An L-shaped dormer is formed by two connected dormer extensions — one to the rear and one to the back addition roof — creating an L-shaped footprint in the loft. This is the most common conversion for Victorian and Edwardian terraced houses with a rear 'outrigger' or back addition, as it maximises the available loft space across both roof sections.
The result is typically two or three usable rooms in the loft — a master bedroom, en-suite and potentially a study or dressing room. Getting 3 quotes is particularly important for L-shaped dormers as complexity and pricing vary considerably between builders.
Typical cost: L-shaped dormer conversion £40,000–£60,000. L-shaped with two en-suites or high specification £55,000–£80,000.
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.”