From £17,564
JG Brickwork Services Limited is an established extension buildering business in RH15. We come highly recommended and provide competitive quotes fo...
From £17,236
Relax... you have found a reliable extension builder in RH15. Atlas Installations is a friendly and reliable company based in RH15 who consider no ...
From £17,348
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,284
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
From £18,100
Rjscarpentryconstruction is a well established company with over 30 years of experience in the carpentry and construction industries
From £17,660
Trusted and professional extension builder in RH15. Experienced in all extension buildering work and keeping within budget and on quote. W&S BUILDI...
From £17,860
TOLLEY CARPENTRY is an established extension buildering business in RH15. We come highly recommended and provide competitive quotes for your work.<...
From £17,612
Experienced extension builder ready to quote for your work. MRA CONSTRUCTION is the best extension builder in RH15. No obligation free quotes and m...
From £15,516
Ferguson Building Services Limited is an established and experienced local extension builder in RH15. Please contact us for a free, no obligation q...
From £17,436
Extensions, Refurbishments & Loft ConversionsAt Keystone our mission is to help our clients imagine, design & build environments that enhance their...

Underpinning ranges from £15,516 (Ferguson Building Services Limited based in BN6) to £18,100 (RJ's Carpentry Construction based in RH15), 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 RH15 by posting a job with HaMuch and we will send it to extension builders in RH15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Burgess Hill | £36 | £240 |
| Underpin A Building near Haywards Heath | £35 | £256 |
| Underpin A Building near Mid Sussex | £35 | £261 |
| Underpin A Building near Brighton and Hove | £35 | £251 |
| Underpin A Building near Brighton | £35 | £251 |
| Underpin A Building near Shoreham-by-Sea | £36 | £250 |
| Underpin A Building near Horsham | £38 | £265 |
| Underpin A Building near Crawley | £38 | £255 |
| Underpin A Building near Lancing | £37 | £251 |
| Underpin A Building near East Grinstead | £37 | £259 |
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 - £17,362

Two storey extension - £87,792

Build a timber frame extension - £25,862

Build a swimming pool - £80,862

Single storey extension - £52,232

Side return extension - £39,943

Install an RSJ - £2,062

Outbuilding - £9,862

Build a Mansard loft conversion - £51,862

Loft conversion - £32,453

Build a kitchen extension - £41,862

Hip to gable loft conversion - £41,862

Granny annexe - £86,862

Garden office - £9,862

Convert a Garage - £15,862

Garage - £18,362

Build a flat roof extension - £21,862

Build a dormer loft conversion - £41,862

Concrete foundations - £6,112

Convert a bungalow loft - £28,862

Convert a basement - £35,943