From £88,120
ADOVA are here to help customers who need an Extension Builder in Chelsea. We offer a competitive rate to complete all your extension buildering jo...
From £88,396
Greater London, SW3
Trusted and professional extension builder in Chelsea. Experienced in all extension buildering work and keeping within budget and on quote. Oro Pro...
From £88,372
Experienced extension builder ready to quote for your work. Clarisford is the best extension builder in Chelsea. No obligation free quotes and many...
From £88,792
Chelsea Greater London, SW3
Clarisford is a property developer and Design & Build firm that specialise in the creation of extraordinary projects from concept all the way to co...
From £88,612
Our building services company Autas Developments have fifteen years' experience of helping customers in Central London and the surrounding areas by...
From £88,396
Chelsea Greater London, SW3
We specialise in mid to high end residential renovations.Offering comprehensive Design and Build packages that Inc all necessary reports, plans and...
From £87,844
Trusted and professional extension builder in Chelsea. Experienced in all extension buildering work and keeping within budget and on quote. Sloane ...
From £88,588
Trusted and professional extension builder in Chelsea. Experienced in all extension buildering work and keeping within budget and on quote. Propert...
From £88,636
Builders by Design Ltd are here to help customers who need an Extension Builder in Chelsea. We offer a competitive rate to complete all your extens...
From £88,504
Greater London, SW3
Need to find an Extension Builder near you for all your extension buildering work?
Hearne House provides a local, trusted extension builder...

Costs range from £87,844 (Sloane Ave Renovations based in SW1X) to £88,792 (Clarisford based in SW3), but these are just estimates. The best way to compare costs is to get real quotes from real builders.
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Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

Underpin a building - £17,784

Two storey extension - £88,426

Build a timber frame extension - £26,284

Build a swimming pool - £81,284

Single storey extension - £60,680

Side return extension - £44,695

Install an RSJ - £2,484

Outbuilding - £10,284

Build a Mansard loft conversion - £52,284

Loft conversion - £36,413

Build a kitchen extension - £42,284

Hip to gable loft conversion - £42,284

Granny annexe - £87,284

Garden office - £10,284

Convert a Garage - £16,284

Garage - £18,784

Build a flat roof extension - £22,284

Build a dormer loft conversion - £42,284

Concrete foundations - £6,534

Convert a bungalow loft - £29,284

Convert a basement - £40,695