GS Renovation converts lofts in Wood Green, where Edwardian terraces near Alexandra Palace sit alongside mansion flats. In N22 the answer depends entirely on whether you own a house or a flat, and we establish that first. Where the roof is yours, we coordinate the engineer and carry Haringey Council building control to sign-off.
Houses convert, flats generally do not
If you own a whole Edwardian house in Wood Green, the roof is yours and the conversion is a normal project. If you own a flat in one of the area's mansion blocks, the roof void belongs to the freeholder, and building into it needs their consent, a lease variation and usually agreement from other leaseholders, with the block's fire strategy and common stair often ruling the scheme out. We say that at the enquiry stage rather than after a survey fee.
On a whole house the Edwardian roof usually clears the 2.2m to 2.4m of ridge height a conversion needs. With a rear closet wing an L-shaped dormer gives a double bedroom and a bathroom, at roughly £55,000 to £80,000 on indicative London ranges for 2026. Without one, a rear dormer at roughly £45,000 to £65,000 still delivers a full width room across the back of the house.
Haringey Council and building regulations in N22
Some Wood Green streets carry permitted development rights for a rear dormer within the 40 cubic metre terraced volume allowance, subject to the usual conditions on matching materials, obscure glazed side windows and not projecting forward of the roof plane. Others fall inside conservation areas where those rights are withdrawn and Haringey Council decides the design. Previous rear extensions also draw down the allowance, so the planning history is checked alongside the designation.
Regardless of the planning route, the regulations govern the build. The engineer designs the floor structure, with new joists carried on steel beams spanning between party walls onto padstones and sitting clear of the existing ceiling joists. Part B requires a protected stair route with fire doors and interlinked alarms, Part K sets the stair geometry, and Part L covers insulation. Haringey building control inspects each stage and issues the completion certificate, and we build to those designs rather than producing the calculations ourselves.
- L-shaped dormers over a rear closet wing
- En suite plumbing, drainage and mechanical extraction
- Velux and conservation rooflights fitted and flashed
- Insulation between and over rafters to Part L
- Rear dormers to win full head height across the new floor
Why Choose GS Renovation in Wood Green
Wood Green homeowners choose GS Renovation because we separate what is possible from what is not before any money is committed, then deliver the whole build. Steels, floor, dormer, stair, insulation, bathroom and decoration from one accountable team, with Haringey Council building control carried through. Founder-led, with more than 30 years of hands-on experience behind the team.
- Free, no-obligation quotations
- Roof made good, leadwork and guttering finished properly
- Water tank removed and the system converted where it blocks the space
- Honest answer at survey if your roof will not take a conversion
- Straight advice on what is and is not worth spending money on
- Itemised pricing, so you can see what every stage costs