GS Renovation builds loft conversions across Edmonton, where Victorian terraces and interwar housing give families a practical way to add a bedroom without moving. In N9 a well planned rear dormer is usually the best value on the roof. We coordinate the engineer, build the structure and carry Enfield Council building control to sign-off.
Rear dormers that earn their cost in N9
The typical Edmonton terrace has a decent ridge height and a straightforward rear slope, which makes a box dormer across the back the efficient choice. It converts sloped, unusable roof into full standing height, so you get a genuine double bedroom rather than a room you can only stand up in down the middle. Where the house has a rear closet wing, extending the dormer down over it as an L shape buys you the bathroom as well.
Indicative London ranges for 2026 put a rear dormer at roughly £45,000 to £65,000 and an L-shaped dormer at roughly £55,000 to £80,000, with an en suite adding £8,000 to £15,000. Against the cost of moving to a larger house in North London, that comparison is what brings most N9 homeowners to us. We quote the whole job, including the stair, insulation, electrics and decoration, so the figure you get is the figure you pay.
Enfield Council, volumes and shared walls
A rear dormer on an Edmonton terrace often sits within permitted development, using the 40 cubic metre allowance for terraced houses, or 50 where the house is semi-detached. The conditions apply in full: materials to match the existing house, no extension beyond the roof plane on the elevation facing the highway, no verandas or balconies, and any side facing window obscure glazed. Conservation area designation or an Article 4 direction cancels those rights, so we check with Enfield Council first.
Where your house is joined to a neighbour, cutting steel bearings or a dormer cheek into the party wall is notifiable under the Party Wall etc. Act 1996. As the building owner you serve the notice; we prepare what sits behind it and schedule the work around the response period. Building control inspections then run alongside the build, covering the floor structure, fire protection, stairs and insulation.
- Water tank removal and conversion to a sealed system
- Ventilation paths kept clear at eaves and ridge
- Insulation between and over rafters to Part L
- Protected stair enclosure and fire doors to Part B
- Interlinked mains-powered smoke alarms
Why Edmonton Homeowners Choose GS Renovation
Edmonton homeowners choose GS Renovation for a straight answer on cost and a single team who finish what they start. Engineer coordination, steels, new floor, dormer, stair, plastering, electrics and decoration are all ours, and Enfield Council building control signs the work off at the end. Fully insured, free no-obligation quotations, with a founder of 30+ years experience.
- Registered in England, Companies House no. 14611254
- Staircase set out to Part K within the space you have
- Roof type assessed so you get the scheme your house can actually take
- Paperwork and certificates handed over for when you sell
- Roof made good, leadwork and guttering finished properly
- A written scope and programme agreed before work starts