From £17,252
Jackson Developments provides an affordable, quality service for customers across Cornwall.We undertake all aspects of building work and can manage...
From £17,292
Need to find an Extension Builder near you for all your extension buildering work?
Samuel Winn Design & Build provides a local, trusted ext...
From £17,244
Trusted and professional extension builder in Penryn. Experienced in all extension buildering work and keeping within budget and on quote. Jo Trace...
From £17,396
Need an Extension Builder in Penryn? Cloverfield Construction Ltd has been helping local clients (20 mile radius) with their extension buildering j...
From £17,284
Need to find an Extension Builder near you for all your extension buildering work?
KPK Builders Ltd provides a local, trusted extension bui...
From £17,060
TR1 Construction Ltd is a one-stop solution for all your extension buildering needs. Establish over 10 years ago and covering 20 miles around Penry...
From £17,404
At peninsula refurbishment we provide a service from start to finish with minimal hassle for the customer. The workmanship is always high priority,...
From £17,132
J C MITCHELL BUILDERS LTD is a trusted extension builder serving customers in Penryn and the surrounding area. Contact us to today to get a competi...
From £17,316
Rock Construction is a trusted extension builder serving customers in Penryn and the surrounding area. Contact us to today to get a competitive quo...
From £17,044
Experienced extension builder ready to quote for your work. KEAST CONSTRUCTION LTD is the best extension builder in Penryn. No obligation free quot...

Underpinning ranges from £17,044 (KEAST CONSTRUCTION LTD based in TR1) to £17,404 (Peninsula Property Refurbishments based in TR15), 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 Penryn by posting a job with HaMuch and we will send it to extension builders in Penryn.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Falmouth | £33 | £220 |
| Underpin A Building near Truro | £31 | £206 |
| Underpin A Building near Camborne | £28 | £196 |
| Underpin A Building near St Ives, Cornwall | £27 | £188 |
| Underpin A Building near Newquay | £32 | £230 |
| Underpin A Building near St Austell | £38 | £245 |
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 - £17,242

Two storey extension - £87,614

Build a timber frame extension - £25,742

Build a swimming pool - £80,742

Single storey extension - £49,848

Side return extension - £38,602

Install an RSJ - £1,942

Outbuilding - £9,742

Build a Mansard loft conversion - £51,742

Loft conversion - £31,335

Build a kitchen extension - £41,742

Hip to gable loft conversion - £41,742

Granny annexe - £86,742

Garden office - £9,742

Convert a Garage - £15,742

Garage - £18,242

Build a flat roof extension - £21,742

Build a dormer loft conversion - £41,742

Concrete foundations - £5,992

Convert a bungalow loft - £28,742

Convert a basement - £34,602