GS Renovation carries out loft work in Chelsea, on the Georgian and Victorian townhouses running off the King's Road in SW3. Almost every property here is listed or within a conservation area, so permitted development does not apply and consent comes first. We build to the architect's and engineer's drawings and manage the Royal Borough of Kensington and Chelsea building control.
Listed buildings and consent in SW3
Permitted development rights for loft conversions are removed on listed buildings and in conservation areas, and SW3 is comprehensively covered by both. A Chelsea roof alteration therefore needs a full planning application, and where the building is listed, listed building consent as well, judged on the effect on the roofscape and on historic fabric inside. That is design work for a conservation architect and a structural engineer. We are the contractor who builds it, and we will not pretend to produce those drawings or calculations ourselves.
Where consent is granted it is usually for a mansard, sometimes a closet wing dormer that cannot be seen from the street, and occasionally only conservation rooflights set flush into the slope. Mansards are the most expensive loft type, roughly £70,000 to £100,000 or more on indicative London ranges for 2026, and a Chelsea job typically runs above that once original joinery, cornices and roof coverings have to be matched or reinstated.
Building on a historic Chelsea roof
Head height governs what is achievable before anything else. You want around 2.2m to 2.4m from the existing ceiling joists to the ridge, and where a Georgian house falls short, the options are lowering ceilings below, which is rarely acceptable in a listed interior, or raising the roof, which needs consent in its own right. The new floor sits on joists sized by the engineer and carried on steel beams to the party walls, never on the original ceiling joists.
These townhouses are tall, so Part B is demanding: a protected stair route the full height of the house to a final exit, fire doors, interlinked alarms, and often a fire strategy agreed with the Royal Borough building control before work starts. Steels bearing into party walls make the job notifiable under the Party Wall etc. Act 1996. You serve the notice as building owner and we prepare the details your surveyor needs.
- Mansard conversions where planning will not accept a dormer
- Insulation between and over rafters to Part L
- Protected stair enclosure and fire doors to Part B
- Head height and ridge survey before design
- Dormer cheeks, flat roof and leadwork detailed to last
Trusted Loft Conversion in Chelsea
Chelsea clients choose GS Renovation because heritage work needs a contractor who follows the drawings exactly and documents what has been done. We coordinate the architect and structural engineer, install steelwork to their design, run the Royal Borough building control process and keep an occupied SW3 house clean and secure throughout. Fully insured, Companies House no. 14611254, 30+ years of hands-on experience behind the founder.
- Waste cleared as we go, not left piled in the garden
- Ridge height measured before any design work is commissioned
- Photographs kept at each stage for your records
- Neighbours given notice before the noisy stages
- Clean, tidy and reliable tradespeople
- Roof made good, leadwork and guttering finished properly