Mark Robinson
Trusted and professional extension builder in St Helens. Experienced in all extension buildering work and keeping within budget and on quote. M L R...
Need an Extension Builder in St Helens? KMC Brickwork has been helping local clients (20 mile radius) with their extension buildering jobs for many...
G. Finnigan Builders is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for yo...
Stephen Lowe
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Relax... you have found a reliable extension builder in St Helens. Jc Properties is a friendly and reliable company based in St Helens who consider...
Peter Gallagher
Experienced extension builder ready to quote for your work. P & P Building Services is the best extension builder in St Helens. No obligation free ...
Liverpool Builder is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for your ...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Need to find an Extension Builder near you for all your extension buildering work?
JOHN ROSS BUILDERS LTD provides a local, trusted extensi...
Relax... you have found a reliable extension builder in St Helens. R Sargeant is a friendly and reliable company based in St Helens who consider no...

Underpinning ranges from £17,052 (Liverpool Builder based in L12) to £17,436 (P & P Building Services based in L11), 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 St Helens by posting a job with HaMuch and we will send it to extension builders in St Helens.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near St Helens | £31 | £224 |
| Underpin A Building near Prescot | £31 | £223 |
| Underpin A Building near Knowsley | £31 | £222 |
| Underpin A Building near Newton-le-Willows | £31 | £221 |
| Underpin A Building near Huyton with Roby | £31 | £225 |
| Underpin A Building near Ashton-in-Makerfield | £30 | £220 |
| Underpin A Building near Widnes | £31 | £220 |
| Underpin A Building near Golborne | £30 | £222 |
| Underpin A Building near Orrell | £29 | £214 |
| Underpin A Building near Kirkby | £31 | £224 |
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 - £17,217

Two storey extension - £87,575

Build a timber frame extension - £25,717

Build a swimming pool - £80,717

Single storey extension - £49,336

Side return extension - £38,314

Install an RSJ - £1,917

Outbuilding - £9,717

Build a Mansard loft conversion - £51,717

Loft conversion - £31,095

Build a kitchen extension - £41,717

Hip to gable loft conversion - £41,717

Granny annexe - £86,717

Garden office - £9,717

Convert a Garage - £15,717

Garage - £18,217

Build a flat roof extension - £21,717

Build a dormer loft conversion - £41,717

Concrete foundations - £5,967

Convert a bungalow loft - £28,717

Convert a basement - £34,314