From £17,772
Trusted and professional extension builder in CB3. Experienced in all extension buildering work and keeping within budget and on quote. IJC Buildin...
From £17,476
Need an Extension Builder in CB3? SturdyBuild has been helping local clients (20 mile radius) with their extension buildering jobs for many years. ...
From £17,628
Need an Extension Builder in CB3? Baufritz (UK) Limited has been helping local clients (20 mile radius) with their extension buildering jobs for ma...
From £17,908
Need to find an Extension Builder near you for all your extension buildering work?
Louise Swarbrick Design provides a local, trusted extens...
From £17,668
Based in Cambridgeshire James Burch Roofing specialises in flat roofing in felt and single ply membranes. For the past 10 years we have worked thro...
From £17,732
WESTWICK BUILDERS LIMITED is an established extension buildering business in CB3. We come highly recommended and provide competitive quotes for you...
From £17,884
Comprehensive, Intelligent Construction Service offering Domestic and Commercial Buildings, Barn, Basement and Loft Conversions, Renovation & Refur...
From £17,652
Relax... you have found a reliable extension builder in CB3. CROWNBUILD is a friendly and reliable company based in CB3 who consider no job as too ...
From £17,876
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,580
Coulson Building Group is a trusted extension builder serving customers in CB3 and the surrounding area. Contact us to today to get a competitive q...

Underpinning ranges from £17,476 (SturdyBuild based in CB3) to £17,908 (Louise Swarbrick Design based in CB3), 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 CB3 by posting a job with HaMuch and we will send it to extension builders in CB3.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Cambridge | £38 | £271 |
| Underpin A Building near South Cambridgeshire | £43 | £305 |
| Underpin A Building near Huntingdon | £38 | £284 |
| Underpin A Building near St Neots | £51 | £318 |
| Underpin A Building near Biggleswade | £41 | £268 |
| Underpin A Building near Ely | £40 | £279 |
| Underpin A Building near Huntingdonshire | £36 | £290 |
| Underpin A Building near Letchworth | £44 | £283 |
| Underpin A Building near Haverhill | £37 | £260 |
| Underpin A Building near North Hertfordshire | £44 | £283 |
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 - £17,718

Two storey extension - £88,326

Build a timber frame extension - £26,218

Build a swimming pool - £81,218

Single storey extension - £59,352

Side return extension - £43,948

Install an RSJ - £2,418

Outbuilding - £10,218

Build a Mansard loft conversion - £52,218

Loft conversion - £35,790

Build a kitchen extension - £42,218

Hip to gable loft conversion - £42,218

Granny annexe - £87,218

Garden office - £10,218

Convert a Garage - £16,218

Garage - £18,718

Build a flat roof extension - £22,218

Build a dormer loft conversion - £42,218

Concrete foundations - £6,468

Convert a bungalow loft - £29,218

Convert a basement - £39,948