GS Renovation builds loft conversions in Kew, on the Victorian and Edwardian terraces between the Gardens and the river. Conservation area coverage is extensive across TW9, so the roof form has to be designed for Richmond Council rather than assumed. We coordinate the engineer, build the structure and see building control through to the certificate.
Designing a Kew roof for Richmond Council
Kew's terraces sit within conservation areas over much of TW9, and that removes permitted development rights for loft alterations. A full application to Richmond Council follows, and the roof form matters to the outcome. A wide flat-roofed dormer visible from the street or from open ground is the version most often resisted, while a mansard rebuilding the rear slope, smaller dormers in a traditional pattern, or conservation rooflights sitting flush with the slope are the forms officers will normally discuss.
The internal gain differs a great deal between those options. A mansard yields the most volume of any loft type and costs the most, at roughly £70,000 to £100,000 or more as an indicative London range for 2026. A rooflight scheme adds no volume at all and comes in around £30,000 to £45,000, which is the right answer where the ridge is tall and you want a study or spare bedroom rather than a suite. Head height is measured before either is priced.
Steel, stairs and the party wall in TW9
Under any roof form, the structure works the same way. Steel beams span between the party walls to carry the new floor and the dormer above, sized by the structural engineer and bearing onto padstones cut into the brickwork. The existing ceiling joists play no part in this, having never been designed to carry a floor. The old cold water tank comes out at the same time and most houses move to a combi boiler or an unvented cylinder as part of the enabling work.
Terraces in Kew share walls on one or both sides, so cutting in steel or building a dormer cheek off that wall is notifiable under the Party Wall etc. Act 1996. You serve the notice as building owner and we prepare the drawings and details behind it. Richmond Council building control then inspects the fire strategy under Part B, the stair against Part K, the structure and the insulation, and issues the completion certificate at the end of the job.
- Ventilation paths kept clear at eaves and ridge
- Staircase design to Part K, including the landing below
- Trussed roofs redesigned before any web is cut
- Velux and conservation rooflights fitted and flashed
- Structural steel sized by the engineer and set on padstones
Why Choose GS Renovation in Kew
Kew owners choose GS Renovation because TW9 lofts are decided by design and detail, and we build to the design your architect and engineer produce rather than improvise on the roof. Party wall paperwork, Richmond Council building control and a clean site in an occupied house come as standard. Founder Abdelaaziz Saaid has 30+ years of hands-on structural experience behind the work, and we are fully insured.
- Straight advice on what is and is not worth spending money on
- Honest answer at survey if your roof will not take a conversion
- Water tank removed and the system converted where it blocks the space
- Paperwork and certificates handed over for when you sell
- Waste cleared as we go, not left piled in the garden
- Materials priced at options, so you choose the finish