From £17,660
Trusted and professional extension builder in BN6. Experienced in all extension buildering work and keeping within budget and on quote. W&S BUILDIN...
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 £17,236
Relax... you have found a reliable extension builder in BN6. Atlas Installations is a friendly and reliable company based in BN6 who consider no jo...
From £17,564
JG Brickwork Services Limited is an established extension buildering business in BN6. We come highly recommended and provide competitive quotes for...
From £15,516
Ferguson Building Services Limited is an established and experienced local extension builder in BN6. Please contact us for a free, no obligation qu...
From £17,596
Experienced extension builder ready to quote for your work. Miles Better Builds is the best extension builder in BN6. No obligation free quotes and...
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 £18,100
Rjscarpentryconstruction is a well established company with over 30 years of experience in the carpentry and construction industries
From £17,860
TOLLEY CARPENTRY is an established extension buildering business in BN6. We come highly recommended and provide competitive quotes for your work.
From £17,516
Trusted and professional extension builder in BN6. Experienced in all extension buildering work and keeping within budget and on quote. Good Constr...

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 BN6 by posting a job with HaMuch and we will send it to extension builders in BN6.
| 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 Brighton and Hove | £35 | £251 |
| Underpin A Building near Mid Sussex | £35 | £261 |
| Underpin A Building near Brighton | £35 | £251 |
| Underpin A Building near Shoreham-by-Sea | £36 | £250 |
| Underpin A Building near Lancing | £37 | £251 |
| Underpin A Building near Horsham | £38 | £265 |
| Underpin A Building near Worthing | £35 | £251 |
| Underpin A Building near Crawley | £38 | £255 |
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 - £17,368

Two storey extension - £87,802

Build a timber frame extension - £25,868

Build a swimming pool - £80,868

Single storey extension - £52,360

Side return extension - £40,015

Install an RSJ - £2,068

Outbuilding - £9,868

Build a Mansard loft conversion - £51,868

Loft conversion - £32,513

Build a kitchen extension - £41,868

Hip to gable loft conversion - £41,868

Granny annexe - £86,868

Garden office - £9,868

Convert a Garage - £15,868

Garage - £18,368

Build a flat roof extension - £21,868

Build a dormer loft conversion - £41,868

Concrete foundations - £6,118

Convert a bungalow loft - £28,868

Convert a basement - £36,015