Relax... you have found a reliable extension builder in SL7. ABC Associates STRUCTURES 4 U is a friendly and reliable company based in SL7 who cons...
GREENWORKS CONSTRUCTION is an established and experienced local extension builder in SL7. Please contact us for a free, no obligation quote and com...
Trusted and professional extension builder in SL7. Experienced in all extension buildering work and keeping within budget and on quote. Shaks build...
From £17,780
Stonehouse Consultants is an independent specialist construction consultancy delivering a range of quality construction services to projects throug...
From £17,476
Georgie Noone has worked in the property industry for the last 15 years, undertaking house refurbishments, extensions and new builds. She has worke...
From £17,620
Relax... you have found a reliable extension builder in SL7. SPACE Design. Build. Interiors is a friendly and reliable company based in SL7 who con...
From £17,804
James Dawson
Our maidenhead based Carpentry, Joinery & Building company can offer a complete single room or property solution to you. Working with han...
From £17,684
Experienced extension builder ready to quote for your work. Good Country Builders is the best extension builder in SL7. No obligation free quotes a...
From £17,580
Need to find an Extension Builder near you for all your extension buildering work?
Complete Home Development provides a local, trusted exte...
From £17,404
Experienced extension builder ready to quote for your work. Wooburn Project Management Ltd is the best extension builder in SL7. No obligation free...

Underpinning ranges from £17,404 (Wooburn Project Management Ltd based in HP12) to £17,820 (Shaks build based in Hp12), 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 SL7 by posting a job with HaMuch and we will send it to extension builders in SL7.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Maidenhead | £41 | £273 |
| Underpin A Building near Wycombe | £39 | £271 |
| Underpin A Building near Hazlemere | £40 | £272 |
| Underpin A Building near Slough | £42 | £272 |
| Underpin A Building near Windsor | £41 | £271 |
| Underpin A Building near Windsor & Maidenhead | £42 | £272 |
| Underpin A Building near Gerrards Cross | £43 | £282 |
| Underpin A Building near Woodley | £42 | £266 |
| Underpin A Building near Caversham | £38 | £265 |
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 - £17,648

Two storey extension - £88,222

Build a timber frame extension - £26,148

Build a swimming pool - £81,148

Single storey extension - £57,960

Side return extension - £43,165

Install an RSJ - £2,348

Outbuilding - £10,148

Build a Mansard loft conversion - £52,148

Loft conversion - £35,138

Build a kitchen extension - £42,148

Hip to gable loft conversion - £42,148

Granny annexe - £87,148

Garden office - £10,148

Convert a Garage - £16,148

Garage - £18,648

Build a flat roof extension - £22,148

Build a dormer loft conversion - £42,148

Concrete foundations - £6,398

Convert a bungalow loft - £29,148

Convert a basement - £39,165