From £55,960
Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in SW20. No obligation free quotes...
From £55,960
Trusted and professional extension builder in SW20. Experienced in all extension buildering work and keeping within budget and on quote. WHITE EAGL...
From £62,840
Need an Extension Builder in SW20? Samuele Paolini has been helping local clients (5 mile radius) with their extension buildering jobs for many ye...
From £58,200
Homeowners look no further if you want a qualified extension builder to work in your home. LCD Pixel Construction Ltd are tidy and neat, providing ...
From £61,560
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £53,400
Masonic Plumbing and Heating Ltd are here to help customers who need an Extension Builder in SW20. We offer a competitive rate to complete all your...
From £58,840
Gb construction are here to help customers who need an Extension Builder in SW20. We offer a competitive rate to complete all your extension build...
From £58,680
Experienced extension builder ready to quote for your work. CC&D BUILDING LTD is the best extension builder in SW20. No obligation free quotes and ...
From £61,240
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £66,200
Our homes need to be regularly maintained and from time to time they need to be rejuvenated, modernised and enhanced. When it comes to building wor...

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 - £17,714

Two storey extension - £88,322

Build a timber frame extension - £26,214

Build a swimming pool - £81,214

Single storey extension - £59,288

Side return extension - £43,912

Install an RSJ - £2,414

Outbuilding - £10,214

Build a Mansard loft conversion - £52,214

Loft conversion - £35,760

Build a kitchen extension - £42,214

Hip to gable loft conversion - £42,214

Granny annexe - £87,214

Garden office - £10,214

Convert a Garage - £16,214

Garage - £18,714

Build a flat roof extension - £22,214

Build a dormer loft conversion - £42,214

Concrete foundations - £6,464

Convert a bungalow loft - £29,214

Convert a basement - £39,912