Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Steve Knight Construction is a High Wycombe based Building Company with 38 years experience in all aspects of the Construction Industry. We are abl...
Chris Warren Construction Ltd is an established extension buildering business in HP16. We come highly recommended and provide competitive quotes fo...
From £17,572
As a full-service provider, we are dedicated to delivering an outstanding fit out experience for all of our customers. With our innovative designs,...
From £17,628
Trusted and professional extension builder in HP16. Experienced in all extension buildering work and keeping within budget and on quote. Steve Knig...
From £17,956
AQUITAINE(BUILDING SERVICES)LT is an established and experienced local extension builder in HP16. Please contact us for a free, no obligation quote...
From £17,852
CONCEPT BUILD are here to help customers who need an Extension Builder in HP16. We offer a competitive rate to complete all your extension builderi...

Underpinning ranges from £17,572 (Chamfer Projects based in HP13) to £17,956 (AQUITAINE(BUILDING SERVICES)LT based in HP16), 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 HP16 by posting a job with HaMuch and we will send it to extension builders in HP16.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Hazlemere | £40 | £272 |
| Underpin A Building near Chesham | £42 | £277 |
| Underpin A Building near Wycombe | £40 | £271 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Berkhamsted | £41 | £263 |
| Underpin A Building near Aylesbury | £42 | £270 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near Gerrards Cross | £43 | £282 |
| Underpin A Building near Hemel Hempstead | £42 | £270 |
| Underpin A Building near Rickmansworth | £42 | £279 |
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 - £17,798

Two storey extension - £88,447

Build a timber frame extension - £26,298

Build a swimming pool - £81,298

Single storey extension - £60,966

Side return extension - £44,856

Install an RSJ - £2,498

Outbuilding - £10,298

Build a Mansard loft conversion - £52,298

Loft conversion - £36,546

Build a kitchen extension - £42,298

Hip to gable loft conversion - £42,298

Granny annexe - £87,298

Garden office - £10,298

Convert a Garage - £16,298

Garage - £18,798

Build a flat roof extension - £22,298

Build a dormer loft conversion - £42,298

Concrete foundations - £6,548

Convert a bungalow loft - £29,298

Convert a basement - £40,856