From £17,780
Trusted and professional extension builder in HP18. Experienced in all extension buildering work and keeping within budget and on quote. BUILDRIGHT...
From £17,628
Relax... you have found a reliable extension builder in HP18. Trew Builders is a friendly and reliable company based in HP18 who consider no job as...
From £17,668
Platinum Build Ltd are here to help customers who need an Extension Builder in HP18. We offer a competitive rate to complete all your extension bui...
From £17,756
Thame Builders Ltd: Your Local Professional Building Experts.\n\nAt Thame Builders, we pride ourselves on being more than just a construction compa...
From £17,804
done lots of extensions and refurbishment of houses from 2004-2012 in london from 2012 till now in oxfordshire area.
From £17,948
Trusted and professional extension builder in HP18. Experienced in all extension buildering work and keeping within budget and on quote. C HORWOOD ...
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 £17,660
D M B E BUILDPLUS is an established and experienced local extension builder in HP18. Please contact us for a free, no obligation quote and competit...
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...

Underpinning ranges from £17,580 (ADC Landscape And Garden Maintenance Contractors based in HP21) to £17,948 (C HORWOOD CONSTRUCTION based in HP19), 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 HP18 by posting a job with HaMuch and we will send it to extension builders in HP18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Aylesbury Vale | £36 | £246 |
| Underpin A Building near Aylesbury | £42 | £270 |
| Underpin A Building near Bicester | £35 | £249 |
| Underpin A Building near Cherwell | £35 | £249 |
| Underpin A Building near Oxford | £37 | £265 |
| Underpin A Building near South Oxfordshire | £36 | £253 |
| Underpin A Building near Wycombe | £39 | £271 |
| Underpin A Building near Leighton Buzzard | £38 | £270 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Hazlemere | £40 | £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 - £17,718

Two storey extension - £88,328

Build a timber frame extension - £26,218

Build a swimming pool - £81,218

Single storey extension - £59,368

Side return extension - £43,957

Install an RSJ - £2,418

Outbuilding - £10,218

Build a Mansard loft conversion - £52,218

Loft conversion - £35,798

Build a kitchen extension - £42,218

Hip to gable loft conversion - £42,218

Granny annexe - £87,218

Garden office - £10,218

Convert a Garage - £16,218

Garage - £18,718

Build a flat roof extension - £22,218

Build a dormer loft conversion - £42,218

Concrete foundations - £6,468

Convert a bungalow loft - £29,218

Convert a basement - £39,957