GS Renovation builds loft conversions across the borough of Lambeth, from the Georgian and early Victorian terraces near Kennington and the South Bank to the bay-fronted streets of SW2, SW4, SW9 and SW16. What suits your roof depends on the era and on whether the street is designated. We survey, then build to the engineer's design.
Choosing between a dormer and a mansard in Lambeth
In the later Victorian and Edwardian terraces around Streatham, Clapham and Herne Hill, the rear closet wing usually makes an L-shaped dormer the best value scheme, giving a full double bedroom plus a shower room off the landing. In the older Georgian and early Victorian stock closer to Kennington and Brixton, where roofs are shallower and set behind parapets, a mansard is frequently the only way to gain the volume, and it is generally what the conservation officer prefers to see.
Feasibility still starts with a tape measure. Roughly 2.2m to 2.4m from the existing ceiling joists to the underside of the ridge is what allows a conversion without lowering ceilings below or rebuilding the roof. We also check where the stair can land within Part K headroom, because in a narrow Lambeth terrace the stair position usually dictates the whole layout, and it is far cheaper to establish that at survey than after drawings are paid for.
Lambeth Council consents and building control
Permitted development allows up to 40 cubic metres on a terraced house and 50 on a semi-detached or detached one, with conditions on matching materials, nothing forward of the roof plane, no balconies and obscure glazed side windows. Lambeth has extensive conservation area coverage and Article 4 directions, which remove those rights, and listed buildings need listed building consent. We check the designation for your specific address with Lambeth Council rather than working from a general rule.
Building control is unavoidable and is where most of the technical content sits: a protected stair route to a final exit with fire doors and interlinked alarms, Part K stair geometry, a new floor on engineer-sized joists carried by steel beams on padstones rather than on the existing ceiling joists, and Part L insulation and ventilation. Those steels bear into the party wall, so notice must be served on adjoining owners by you as building owner before we begin.
- En suite plumbing, drainage and mechanical extraction
- Dormer cheeks, flat roof and leadwork detailed to last
- Rooflight conversions where the roof line must not change
- Building control inspections booked at floor, steel and completion
- Head height and ridge survey before design
Why Lambeth Homeowners Choose GS Renovation
Lambeth homeowners choose GS Renovation because the borough's mix of Georgian, Victorian and designated stock rewards a contractor who checks before promising. We coordinate the engineer and any architect, prepare your party wall information, build the steelwork and fire strategy correctly and see Lambeth building control through to certificate. Free no-obligation quotations and 30+ years of founder experience behind the work.
- Free follow-up visit after completion if anything needs attention
- Protected stair route and fire doors detailed to Part B
- Honest updates if a date or a detail has to move
- Building control applications and inspections coordinated for you
- Staircase set out to Part K within the space you have
- A dedicated project manager from first survey to handover