From £17,460
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,708
Maha Khaliq Design is an established and experienced local extension builder in HP27. Please contact us for a free, no obligation quote and competi...
From £17,956
AQUITAINE(BUILDING SERVICES)LT is an established and experienced local extension builder in HP27. Please contact us for a free, no obligation quote...
From £17,820
Chris Warren Construction Ltd is an established extension buildering business in HP27. We come highly recommended and provide competitive quotes fo...
From £17,468
Hammond Construction is a family owned building, refurbishment and electrical services company who can help you achieve the home of your dreams…
From £17,852
CONCEPT BUILD are here to help customers who need an Extension Builder in HP27. We offer a competitive rate to complete all your extension builderi...
From £17,580
We are ADC Landscaping & Gardening, owned and run by Ashley Collier. We are a family business based in Aylesbury, Buckinghamshire, and cover all as...
From £17,780
Trusted and professional extension builder in HP27. Experienced in all extension buildering work and keeping within budget and on quote. BUILDRIGHT...
From £17,740
AMG Roofing (Bucks) Ltd is owned by Ashley Gibson, a small, friendly, family run business that began in 2020, as a result of the Pandemic and an ac...
From £17,668
Platinum Build Ltd are here to help customers who need an Extension Builder in HP27. We offer a competitive rate to complete all your extension bui...

Underpinning ranges from £17,460 (Bellwood Homes based in HP27) 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 HP27 by posting a job with HaMuch and we will send it to extension builders in HP27.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Wycombe | £39 | £271 |
| Underpin A Building near Hazlemere | £40 | £272 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Aylesbury | £42 | £270 |
| Underpin A Building near Chesham | £42 | £277 |
| Underpin A Building near Berkhamsted | £41 | £263 |
| Underpin A Building near Aylesbury Vale | £36 | £246 |
| Underpin A Building near South Oxfordshire | £36 | £253 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near Maidenhead | £41 | £273 |
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 - £17,703

Two storey extension - £88,305

Build a timber frame extension - £26,203

Build a swimming pool - £81,203

Single storey extension - £59,064

Side return extension - £43,786

Install an RSJ - £2,403

Outbuilding - £10,203

Build a Mansard loft conversion - £52,203

Loft conversion - £35,655

Build a kitchen extension - £42,203

Hip to gable loft conversion - £42,203

Granny annexe - £87,203

Garden office - £10,203

Convert a Garage - £16,203

Garage - £18,703

Build a flat roof extension - £22,203

Build a dormer loft conversion - £42,203

Concrete foundations - £6,453

Convert a bungalow loft - £29,203

Convert a basement - £39,786