Need to find an Extension Builder near you for all your extension buildering work?
6:59 Ltd provides a local, trusted extension buildering ...
Be Illuminated are here to help customers who need an Extension Builder in HP9. We offer a competitive rate to complete all your extension builderi...
Need to find an Extension Builder near you for all your extension buildering work?
JAYEM BUILDING SERVICES LTD provides a local, trusted ex...
Our building services company Charts Project Management and Build has been helping customers in Buckinghamshire and the surrounding area by providi...
Need to find an Extension Builder near you for all your extension buildering work?
Loudwater Building Services provides a local, trusted ex...
E E Construction is an established extension buildering business in HP9. We come highly recommended and provide competitive quotes for your work.
CONSIDERATE BUILDING LIMITED are here to help customers who need an Extension Builder in HP9. We offer a competitive rate to complete all your exte...
Relax... you have found a reliable extension builder in HP9. J MCNAMEE J & J BUILDERS is a friendly and reliable company based in HP9 who consider ...
Kevin Ocallaghanp
Need an Extension Builder in HP9? Bantry Construction Limited has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £17,780
Stonehouse Consultants is an independent specialist construction consultancy delivering a range of quality construction services to projects throug...

Underpinning ranges from £17,660 (Loudwater Building Services based in HP10) to £18,948 (Bantry Construction Limited based in HP10), 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 HP9 by posting a job with HaMuch and we will send it to extension builders in HP9.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Gerrards Cross | £43 | £282 |
| Underpin A Building near Hazlemere | £40 | £272 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Slough | £42 | £272 |
| Underpin A Building near Maidenhead | £41 | £273 |
| Underpin A Building near Rickmansworth | £42 | £279 |
| Underpin A Building near Chesham | £42 | £277 |
| Underpin A Building near Wycombe | £40 | £271 |
| Underpin A Building near Windsor & Maidenhead | £42 | £272 |
| Underpin A Building near Hillingdon | £63 | £276 |
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 - £17,902

Two storey extension - £88,602

Build a timber frame extension - £26,402

Build a swimming pool - £81,402

Single storey extension - £63,032

Side return extension - £46,018

Install an RSJ - £2,602

Outbuilding - £10,402

Build a Mansard loft conversion - £52,402

Loft conversion - £37,515

Build a kitchen extension - £42,402

Hip to gable loft conversion - £42,402

Granny annexe - £87,402

Garden office - £10,402

Convert a Garage - £16,402

Garage - £18,902

Build a flat roof extension - £22,402

Build a dormer loft conversion - £42,402

Concrete foundations - £6,652

Convert a bungalow loft - £29,402

Convert a basement - £42,018