GS Renovation converts lofts in Wallington, where Edwardian and interwar family homes fill the streets around Beddington Park. SM6 stock varies from bay-fronted terraces to hipped-roof semis, so the right conversion differs house by house. We measure first, coordinate the engineer, and carry Sutton Council building control from steelwork through to sign-off.
Matching the conversion to the house in SM6
An Edwardian terrace with a rear closet wing is an L-shaped dormer job, giving a double bedroom and a bathroom in one move. Where there is no wing, a straight rear box dormer is the sensible choice. An interwar semi with a hipped roof usually needs the hip built up into a gable before a rear dormer will produce a full width room. Getting that call right at the survey stage is what keeps the budget and the outcome aligned.
Indicative London ranges for 2026 run from roughly £45,000 to £65,000 for a rear dormer, £55,000 to £80,000 for an L-shaped dormer or a hip to gable with dormer, and £30,000 to £45,000 for a rooflight conversion that adds no volume at all. The rooflight route is worth considering where the existing roof already encloses enough floor area and you want to keep the roof line untouched.
Sutton Council and the technical baseline
Volume allowances differ by house type: 40 cubic metres for a terrace and 50 for a semi or detached, with conditions on matching materials, obscure glazed side windows, no balconies and nothing forward of the roof plane on the principal elevation. Conservation area designation or an Article 4 direction removes permitted development entirely, so we confirm your address with Sutton Council rather than assuming that what applies next door applies to you.
Building regulations then govern the build itself. That means an engineer-designed floor carried on steels and padstones, a protected stair route with fire doors and interlinked alarms under Part B, a stair meeting Part K on rise, going and headroom, and insulation and ventilation to Part L. A space-saver stair with alternating treads is only acceptable where it serves a single room, which is worth knowing before the layout is fixed.
- Hip to gable conversions on semi-detached and end terrace roofs
- Trussed roofs redesigned before any web is cut
- Velux and conservation rooflights fitted and flashed
- Dormer cheeks, flat roof and leadwork detailed to last
- Ventilation paths kept clear at eaves and ridge
Why Choose GS Renovation in Wallington
Wallington homeowners choose GS Renovation because we recommend the conversion the house can actually take, not the most expensive one on the list. Engineer coordination, steels, gable or dormer, stair, insulation, bathroom and decoration come from one team, with Sutton Council building control signed off at the end. Fully insured and building control compliant, with free no-obligation quotations.
- Straight advice on what is and is not worth spending money on
- Honest answer at survey if your roof will not take a conversion
- Free, no-obligation quotations
- Roof type assessed so you get the scheme your house can actually take
- Honest updates if a date or a detail has to move
- Our own trades on site rather than a chain of subcontractors