From £17,788
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 £17,052
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 £17,412
Experienced extension builder ready to quote for your work. Brighton Refresh is the best extension builder in BN9. No obligation free quotes and ma...
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 £17,412
Need an Extension Builder in BN9? LEWES BUILDERS LTD has been helping local clients (20 mile radius) with their extension buildering jobs for many ...
From £17,308
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 ...
From £17,308
The Place Between offers home design and project management services. We work with a network of building professionals. We believe that the transit...
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...

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 - £17,406

Two storey extension - £87,860

Build a timber frame extension - £25,906

Build a swimming pool - £80,906

Single storey extension - £53,128

Side return extension - £40,447

Install an RSJ - £2,106

Outbuilding - £9,906

Build a Mansard loft conversion - £51,906

Loft conversion - £32,873

Build a kitchen extension - £41,906

Hip to gable loft conversion - £41,906

Granny annexe - £86,906

Garden office - £9,906

Convert a Garage - £15,906

Garage - £18,406

Build a flat roof extension - £21,906

Build a dormer loft conversion - £41,906

Concrete foundations - £6,156

Convert a bungalow loft - £28,906

Convert a basement - £36,447