Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Trusted and professional extension builder in New Malden. Experienced in all extension buildering work and keeping within budget and on quote. CSJ ...
Albdeco Builders & Decorators Ltd is a trusted extension builder serving customers in New Malden and the surrounding area. Contact us to today to g...
Tom Flanagan
Very experienced Builder in this area ,Epsom Sutton Raynes pk Wimbledon areas mostly now on recommendation usually also supply Drawings&a Structu...
Need to find an Extension Builder near you for all your extension buildering work?
Leith All Building & Decorating provides a local, truste...
Artin Construction is an established extension buildering business in New Malden. We come highly recommended and provide competitive quotes for you...
Paul Meacher Builders is an established and experienced local extension builder in New Malden. Please contact us for a free, no obligation quote an...
Trusted and professional extension builder in New Malden. Experienced in all extension buildering work and keeping within budget and on quote. Racs...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £17,580 (Paul Meacher Builders based in KT3) to £18,004 (CSJ Building Services based in SM1), but the final cost will depend on the method of underpinning used, how much of your foundations need underpinning and where you live.
Comparing extension builders estimates for underpinning gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get quotes to underpin your home in New Malden by posting a job with HaMuch and we will send it to extension builders in New Malden.
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 - £17,750

Two storey extension - £88,374

Build a timber frame extension - £26,250

Build a swimming pool - £81,250

Single storey extension - £59,992

Side return extension - £44,308

Install an RSJ - £2,450

Outbuilding - £10,250

Build a Mansard loft conversion - £52,250

Loft conversion - £36,090

Build a kitchen extension - £42,250

Hip to gable loft conversion - £42,250

Granny annexe - £87,250

Garden office - £10,250

Convert a Garage - £16,250

Garage - £18,750

Build a flat roof extension - £22,250

Build a dormer loft conversion - £42,250

Concrete foundations - £6,500

Convert a bungalow loft - £29,250

Convert a basement - £40,308