From £17,780
Member since August 2026
Relax... you have found a reliable extension builder in Henley-on-thames. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in...
From £17,932
DP Services is a fully insured friendly local company which has been trading since 2002 and delivers high quality building work in domestic extensi...
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 £17,796
Pinnacle Property Services is a trusted extension builder serving customers in Henley-on-thames and the surrounding area. Contact us to today to ge...
From £17,836
Ohanaa Ltd is a trusted extension builder serving customers in Henley-on-thames and the surrounding area. Contact us to today to get a competitive ...
From £17,612
JASON SHARP SHARP BUILDERS is a trusted extension builder serving customers in Henley-on-thames and the surrounding area. Contact us to today to ge...
From £17,700
The business can carry out all aspects of building work:- single or double storey extensions- kitchen and bathroom installations- p...
From £17,716
Experienced extension builder ready to quote for your work. DRC Construction is the best extension builder in Henley-on-thames. No obligation free ...
From £17,716
Need to find an Extension Builder near you for all your extension buildering work?
BA Knott Oxford Ltd provides a local, trusted extension ...

Underpinning ranges from £17,612 (JASON SHARP SHARP BUILDERS based in HP22) to £17,932 (DP Services based in RG41), 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 Henley-on-thames by posting a job with HaMuch and we will send it to extension builders in Henley-on-thames.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Caversham | £38 | £265 |
| Underpin A Building near Woodley | £42 | £266 |
| Underpin A Building near Reading | £42 | £266 |
| Underpin A Building near Wycombe | £39 | £271 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Maidenhead | £41 | £273 |
| Underpin A Building near South Oxfordshire | £36 | £253 |
| Underpin A Building near Wokingham | £41 | £279 |
| Underpin A Building near Bracknell Forest | £41 | £287 |
| 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 - £17,744

Two storey extension - £88,366

Build a timber frame extension - £26,244

Build a swimming pool - £81,244

Single storey extension - £59,880

Side return extension - £44,245

Install an RSJ - £2,444

Outbuilding - £10,244

Build a Mansard loft conversion - £52,244

Loft conversion - £36,038

Build a kitchen extension - £42,244

Hip to gable loft conversion - £42,244

Granny annexe - £87,244

Garden office - £10,244

Convert a Garage - £16,244

Garage - £18,744

Build a flat roof extension - £22,244

Build a dormer loft conversion - £42,244

Concrete foundations - £6,494

Convert a bungalow loft - £29,244

Convert a basement - £40,245