From £17,692
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,780
Member since August 2026
Relax... you have found a reliable extension builder in HP14. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in HP14 who co...
From £17,796
Pinnacle Property Services is a trusted extension builder serving customers in HP14 and the surrounding area. Contact us to today to get a competit...
From £17,596
Matharu Buildings is an established extension buildering business in HP14. We come highly recommended and provide competitive quotes for your work....
From £17,924
Sharp Building Ltd is an established and experienced local extension builder in HP14. Please contact us for a free, no obligation quote and competi...
From £17,500
Member since July 2020
EB Construction & Building Ltd are here to help customers who need an Extension Builder in HP14. We offer a competitive rate to complete all your e...
From £17,836
Ohanaa Ltd is a trusted extension builder serving customers in HP14 and the surrounding area. Contact us to today to get a competitive quote for ex...
From £17,964
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £17,660
EGPM LTD are here to help customers who need an Extension Builder in HP14. We offer a competitive rate to complete all your extension buildering jo...
From £17,612
JASON SHARP SHARP BUILDERS is a trusted extension builder serving customers in HP14 and the surrounding area. Contact us to today to get a competit...

Underpinning ranges from £17,500 (EB Construction & Building Ltd based in HP2) to £17,964 (AV Home Improvements based in WD19), 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 HP14 by posting a job with HaMuch and we will send it to extension builders in HP14.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Wycombe | £39 | £271 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Hazlemere | £40 | £272 |
| Underpin A Building near Maidenhead | £41 | £273 |
| Underpin A Building near Chesham | £42 | £277 |
| Underpin A Building near South Oxfordshire | £36 | £253 |
| Underpin A Building near Aylesbury | £42 | £270 |
| Underpin A Building near Gerrards Cross | £43 | £282 |
| Underpin A Building near Caversham | £38 | £265 |
| Underpin A Building near Slough | £42 | £272 |
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 - £17,736

Two storey extension - £88,354

Build a timber frame extension - £26,236

Build a swimming pool - £81,236

Single storey extension - £59,720

Side return extension - £44,155

Install an RSJ - £2,436

Outbuilding - £10,236

Build a Mansard loft conversion - £52,236

Loft conversion - £35,963

Build a kitchen extension - £42,236

Hip to gable loft conversion - £42,236

Granny annexe - £87,236

Garden office - £10,236

Convert a Garage - £16,236

Garage - £18,736

Build a flat roof extension - £22,236

Build a dormer loft conversion - £42,236

Concrete foundations - £6,486

Convert a bungalow loft - £29,236

Convert a basement - £40,155