Loft conversions
Dormer, hip-to-gable and mansard conversions that turn unused roof space into a bedroom, office or bathroom, with the structure, insulation and finish done properly.
Family-run builders · South London · Since 2013
Loft conversions, extensions and full refurbishments across Croydon, Bromley and the surrounding areas. Over a thousand completed jobs and a 10/10 record on Checkatrade.
What we do
Dormer, hip-to-gable and mansard conversions that turn unused roof space into a bedroom, office or bathroom, with the structure, insulation and finish done properly.
Rear, side and wrap-around extensions for open-plan kitchens and living space, from foundations through steels and roofing to the final decoration.
Whole-house renovations: layouts opened up, new kitchens and bathrooms, plastering, electrics, plumbing and flooring, managed by one contractor from start to finish.
New roofs, flat roofs, repairs and maintenance for homes and commercial buildings.
Load-bearing walls removed, steels installed and large-scale reinforcement, working to your engineer's design.
Commercial fit-outs and refurbishments for restaurant owners, office landlords and housing providers, including work for Westminster Council.
Architects and designers
If you are an architect or designer with a project in our area, we would like to price it. We work from your drawings, build to your specification, keep to the programme and give you one point of contact throughout.
Where we work
Based in South Croydon, we work across Croydon, Bromley, Sutton, Merton, Kingston, Ewell, Reigate, Oxted and Sevenoaks. For the right project we travel further, so do ask.
Our area
What customers say
From the first site visit, Kosta was honest and detailed, suggesting clever tweaks that improved the layout without raising the budget. The crew finished two weeks early. Brickwork blends perfectly, glazing is flawless, and the new open-plan space feels like it was always there.
Rear and side extension · Croydon · Checkatrade, 10/10
Tiling is perfectly aligned, the walk-in shower feels like a hotel spa, and water pressure is excellent. The quote was clear and they finished three days ahead of schedule. Professional, polite and skilled.
Bathroom refurbishment · Bromley · Checkatrade, 10/10
Tell us about your project and we will come back to you with an estimate within two working days.