Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SW18. No obligation free quotes...
Torrington Design
NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...
"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO
Decorating Building Service are here to help customers who need an Extension Builder in SW18. We offer a competitive rate to complete all your exte...
Catalin CIOBANU
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in SW18. No obligation free quotes and ...
Mick Singh
At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.
Jonathan Rimmer
Experienced extension builder ready to quote for your work. Mr is the best extension builder in SW18. No obligation free quotes and many happy cust...
Samuele Paolini
Need an Extension Builder in SW18? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
Tommy House
HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in SW18 and the surrounding area. Contact us to today to get a com...
Krystian Wojasiewicz
Krystian Wojasiewicz is a trusted extension builder serving customers in SW18 and the surrounding area. Contact us to today to get a competitive qu...

Costs range from £88,072 (J&J Building Solutions based in SW16) to £88,924 (HOUSE BUILDING SERVICES LIMITED based in DA16), 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 - £17,778

Two storey extension - £88,418

Build a timber frame extension - £26,278

Build a swimming pool - £81,278

Single storey extension - £60,568

Side return extension - £44,632

Install an RSJ - £2,478

Outbuilding - £10,278

Build a Mansard loft conversion - £52,278

Loft conversion - £36,360

Build a kitchen extension - £42,278

Hip to gable loft conversion - £42,278

Granny annexe - £87,278

Garden office - £10,278

Convert a Garage - £16,278

Garage - £18,778

Build a flat roof extension - £22,278

Build a dormer loft conversion - £42,278

Concrete foundations - £6,528

Convert a bungalow loft - £29,278

Convert a basement - £40,632