From £17,596
Omniform are here to help customers who need an Extension Builder in Old Broad Street. We offer a competitive rate to complete all your extension b...
From £17,908
London Roof Gardens is a trusted extension builder serving customers in Old Broad Street and the surrounding area. Contact us to today to get a com...
From £17,788
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,428
Shine Your Home is an established extension buildering business in Old Broad Street. We come highly recommended and provide competitive quotes for ...
From £17,660
Venta Construction is an established and experienced local extension builder in Old Broad Street. Please contact us for a free, no obligation quote...
From £17,972
Need an Extension Builder in Old Broad Street? GenUp Digital has been helping local clients (5 mile radius) with their extension buildering jobs fo...
From £17,860
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,772
Need an Extension Builder in Old Broad Street? Aylaa Exclusive has been helping local clients (5 mile radius) with their extension buildering jobs ...
From £17,892
We have the experience and knowledge to carry out any project, big or small. Our team of experts thoroughly plan the budget and manage your projec...
From £17,756
Regalia Ltd are a company that regards itself on the excellent craftsmanship and attention to detail that occurs during every process in our projec...

Underpinning ranges from £17,428 (Shine Your Home based in E1) to £17,972 (GenUp Digital based in EC3M), 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 Old Broad Street by posting a job with HaMuch and we will send it to extension builders in Old Broad Street.
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 - £17,763

Two storey extension - £88,395

Build a timber frame extension - £26,263

Build a swimming pool - £81,263

Single storey extension - £60,264

Side return extension - £44,461

Install an RSJ - £2,463

Outbuilding - £10,263

Build a Mansard loft conversion - £52,263

Loft conversion - £36,218

Build a kitchen extension - £42,263

Hip to gable loft conversion - £42,263

Granny annexe - £87,263

Garden office - £10,263

Convert a Garage - £16,263

Garage - £18,763

Build a flat roof extension - £22,263

Build a dormer loft conversion - £42,263

Concrete foundations - £6,513

Convert a bungalow loft - £29,263

Convert a basement - £40,461