GS Renovation builds loft conversions across Tooting, in the Victorian terraces that draw families to SW17 and the streets running up towards Wandsworth Common. The rear closet wing on these houses is what decides the design. We coordinate the engineer, install the steelwork and dormer, and take the job through Wandsworth Council building control.
The extra bedroom an SW17 terrace can hold
The reason families convert rather than move in Tooting is simple arithmetic: an L-shaped dormer over the closet wing usually yields a double bedroom, a bathroom and a landing, which turns a three bedroom terrace into a four bedroom house with two bathrooms. It works because the wing gives the dormer somewhere to turn, and because Victorian ridge heights in SW17 are typically enough to build a new floor and insulate the roof with usable height left.
We measure that first, looking for roughly 2.2m to 2.4m from the existing ceiling joists to the ridge. Where the height is short, the honest options are lowering the ceilings below or altering the roof, and both change the project entirely. Where it is there, indicative London ranges for 2026 put the L-shaped dormer at roughly £55,000 to £80,000, with an en suite adding £8,000 to £15,000.
Wandsworth Council, steels and party wall notices
A rear dormer on a Tooting terrace can fall within permitted development on the 40 cubic metre volume allowance, but conservation area coverage in parts of SW17 removes those rights and puts the design in front of Wandsworth Council. Earlier extensions to the house also eat into the allowance, which is why the planning history matters as much as the map. We establish the position for your address before any design is commissioned.
The floor above your bedrooms is not a floor yet. The existing ceiling joists hold plaster, nothing more, so the engineer specifies new joists carried on steel beams that span between the party walls onto padstones. Cutting those bearings into a shared wall makes the work notifiable under the Party Wall etc. Act 1996. The notice is yours to serve as the building owner, and we prepare everything that sits behind it.
- Rooflight conversions where the roof line must not change
- Mansard conversions where planning will not accept a dormer
- Building control inspections booked at floor, steel and completion
- L-shaped dormers over a rear closet wing
- Interlinked mains-powered smoke alarms
Why Tooting Homeowners Choose GS Renovation
Tooting families choose GS Renovation because we deliver a finished loft, not a stripped shell. One team handles engineer coordination, steels, dormer, stair, insulation, en suite and decoration, works cleanly in an occupied SW17 house, and carries Wandsworth Council building control through to the completion certificate. Fully insured, building control compliant, dedicated project manager.
- One point of contact on the phone, not a call centre
- Aftercare and snagging support once the job is finished
- Protected stair route and fire doors detailed to Part B
- Ridge height measured before any design work is commissioned
- Staircase set out to Part K within the space you have
- Paperwork and certificates handed over for when you sell