Aaron Hale
We are a family run buisness with over 20 years experience. We undertake all aspects of building, carpentry and maintenance work including:
"Great team" - BRIGHTON,reviewed 07/08/17, STEVE
Relax... you have found a reliable extension builder in BN9. R N CONSTRUCTIONS is a friendly and reliable company based in BN9 who consider no job ...
RWL BUILDING SERVICES is an established and experienced local extension builder in BN9. Please contact us for a free, no obligation quote and compe...
From £17,236
Need an Extension Builder in BN9? M J C BUILDING SERVICES has been helping local clients (20 mile radius) with their extension buildering jobs for ...
From £17,052
Kris Barker
We are a family run business, with a combined 60 plus years of carpentry and joinery experience. We cover the whole of sussex. We work to a extreme...
From £17,676
Trusted and professional extension builder in BN9. Experienced in all extension buildering work and keeping within budget and on quote. J L BUILDIN...
From £17,788
Oliver Relton
Here at Complete Property Solutions, we have a small dedicated team of professional, conscientious tradesman with the knowledge and experience to e...
From £17,564
At Prestige we pride ourselves on delivering bespoke projects including Heritage and specialist works.
From £17,308
South Coast Home Improvements Ltd is a trusted extension builder serving customers in BN9 and the surrounding area. Contact us to today to get a co...
From £17,412
Experienced extension builder ready to quote for your work. Brighton Refresh is the best extension builder in BN9. No obligation free quotes and ma...

Underpinning ranges from £17,052 (Barker & sons based in BN10) to £17,788 (Complete Property Solutions (Sussex) Limited based in BN9), 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 BN9 by posting a job with HaMuch and we will send it to extension builders in BN9.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Seaford | £34 | £243 |
| Underpin A Building near Brighton and Hove | £35 | £251 |
| Underpin A Building near Brighton | £35 | £251 |
| Underpin A Building near Eastbourne | £32 | £245 |
| Underpin A Building near Hailsham | £31 | £243 |
| Underpin A Building near Burgess Hill | £36 | £240 |
| Underpin A Building near Shoreham-by-Sea | £36 | £250 |
| Underpin A Building near Wealden | £35 | £256 |
| Underpin A Building near Haywards Heath | £35 | £256 |
| Underpin A Building near Lancing | £37 | £251 |
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 - £17,425

Two storey extension - £87,887

Build a timber frame extension - £25,925

Build a swimming pool - £80,925

Single storey extension - £53,496

Side return extension - £40,654

Install an RSJ - £2,125

Outbuilding - £9,925

Build a Mansard loft conversion - £51,925

Loft conversion - £33,045

Build a kitchen extension - £41,925

Hip to gable loft conversion - £41,925

Granny annexe - £86,925

Garden office - £9,925

Convert a Garage - £15,925

Garage - £18,425

Build a flat roof extension - £21,925

Build a dormer loft conversion - £41,925

Concrete foundations - £6,175

Convert a bungalow loft - £28,925

Convert a basement - £36,654