GS Renovation works on loft conversions in Holland Park, among the substantial period villas and garden square terraces of W11. Almost the whole area is a conservation area, many houses are listed, and a good number are flats. That makes the consents question the first one to settle, and we settle it honestly before any design work.
Conservation areas, listings and W11 roofs
Permitted development is not the starting point here. Across the Royal Borough of Kensington and Chelsea, conservation area designation covers the great majority of streets, and where a house is listed, listed building consent is required for alterations alongside planning permission. A boxy rear dormer on a stucco-fronted villa will not get far. What gets discussed instead is a mansard rebuilding the rear slope at a steep pitch behind a parapet, or conservation rooflights that leave the existing roof profile alone.
Mansards are the dearest type, at roughly £70,000 to £100,000 or more as an indicative London range for 2026, and on the tall houses around the garden squares the figure sits well above that once the stair, the services and the finish match the rest of the house. Head height is rarely the limiting factor on W11 roofs. The planning history, the listing and the neighbouring roofscape usually are, which is why the address gets researched before anything is drawn.
Flats, freeholders and building control
Many Holland Park houses were divided into flats and maisonettes decades ago. If you own the upper flat, the roof space above your ceiling normally belongs to the freeholder, so a conversion needs that interest bought or licensed and the lease varied before a single drawing is worth paying for. In a listed building, add listed building consent on top of all that. We say plainly when the answer is no rather than charge for a scheme that cannot be built.
Where you own a whole house, the build follows the usual structural logic: steel beams between the party walls carrying a new floor on engineer-sized joists, padstone bearings, and a protected stairwell to a final exit under Part B, which matters more in a tall house with several storeys already. The Royal Borough's building control inspects the stair against Part K, the fire separation and the insulation. In a terrace, party wall notices go to both neighbours, served by you.
- Dormer cheeks, flat roof and leadwork detailed to last
- Staircase design to Part K, including the landing below
- Rear dormers to win full head height across the new floor
- Water tank removal and conversion to a sealed system
- Protected stair enclosure and fire doors to Part B
Why Choose GS Renovation in Holland Park
Holland Park owners choose GS Renovation because W11 work is governed by consents and by the standard of finish, and we manage both. We coordinate the engineer and designer, deal with the Royal Borough of Kensington and Chelsea on building control, and build carefully in an occupied house. Founder Abdelaaziz Saaid brings 30+ years of hands-on experience, and we are fully insured throughout.
- Ridge height measured before any design work is commissioned
- Honest updates if a date or a detail has to move
- Free follow-up visit after completion if anything needs attention
- Clean, tidy and reliable tradespeople
- Interlinked mains alarms fitted and certified
- Free, no-obligation quotations