BeautifulRenovation are here to help customers who need an Extension Builder in SL6. We offer a competitive rate to complete all your extension bui...
EIC Builders Ltd are here to help customers who need an Extension Builder in SL6. We offer a competitive rate to complete all your extension builde...
B.A Ruffle Building Contractor is an established extension buildering business in SL6. We come highly recommended and provide competitive quotes fo...
Trusted and professional extension builder in SL6. Experienced in all extension buildering work and keeping within budget and on quote. TENNORCREST...
Experienced extension builder ready to quote for your work. A South View is the best extension builder in SL6. No obligation free quotes and many h...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Need to find an Extension Builder near you for all your extension buildering work?
M Roberts provides a local, trusted extension buildering...
From £17,852
SFC CONSTRUCTION is an established and experienced local extension builder in SL6. Please contact us for a free, no obligation quote and competitiv...
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 £17,412
Experienced extension builder ready to quote for your work. Daljit Builders Limited is the best extension builder in SL6. No obligation free quotes...

Underpinning ranges from £17,412 (TENNORCREST CONSTRUCTION based in SL6) to £17,948 (A & M MCGILL BUILDING SERVICE based in SL1), 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 SL6 by posting a job with HaMuch and we will send it to extension builders in SL6.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Maidenhead | £41 | £273 |
| Underpin A Building near Windsor | £41 | £271 |
| Underpin A Building near Windsor & Maidenhead | £42 | £272 |
| Underpin A Building near Slough | £42 | £272 |
| Underpin A Building near High Wycombe | £39 | £272 |
| Underpin A Building near Bracknell Forest | £41 | £287 |
| Underpin A Building near Bracknell | £41 | £285 |
| Underpin A Building near Ascot | £41 | £276 |
| Underpin A Building near Wycombe | £39 | £271 |
| Underpin A Building near Gerrards Cross | £43 | £282 |
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 - £17,594

Two storey extension - £88,142

Build a timber frame extension - £26,094

Build a swimming pool - £81,094

Single storey extension - £56,888

Side return extension - £42,562

Install an RSJ - £2,294

Outbuilding - £10,094

Build a Mansard loft conversion - £52,094

Loft conversion - £34,635

Build a kitchen extension - £42,094

Hip to gable loft conversion - £42,094

Granny annexe - £87,094

Garden office - £10,094

Convert a Garage - £16,094

Garage - £18,594

Build a flat roof extension - £22,094

Build a dormer loft conversion - £42,094

Concrete foundations - £6,344

Convert a bungalow loft - £29,094

Convert a basement - £38,562