From £17,652
Need an Extension Builder in SP1? Moores Build has been helping local clients (20 mile radius) with their extension buildering jobs for many years....
From £17,636
Arkson builders ltd is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and competi...
From £17,812
Shape Project Management is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and co...
From £17,964
Feltham Group Services Limited is an established extension buildering business in SP1. We come highly recommended and provide competitive quotes fo...
From £17,540
Need an Extension Builder in SP1? BARTITIONS DESIGN & BUILD LTD has been helping local clients (20 mile radius) with their extension buildering jo...
From £17,604
JJ Acquisitions ltd is a trusted extension builder serving customers in SP1 and the surrounding area. Contact us to today to get a competitive quot...
From £17,372
Need to find an Extension Builder near you for all your extension buildering work?
R F S BUILDERS provides a local, trusted extension build...
From £17,708
STEWART BUILDERS is an established and experienced local extension builder in SP1. Please contact us for a free, no obligation quote and competitiv...
From £16,348
We specialise in Epoxy Resin and Polyurethane floor coatings and screeds (very durable and seamless flooring), designed for retail, factories, manu...

Underpinning ranges from £16,348 (Floortrak Limited based in SO51) to £17,964 (Feltham Group Services Limited based in SP5), 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 SP1 by posting a job with HaMuch and we will send it to extension builders in SP1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Salisbury | £35 | £247 |
| Underpin A Building near Test Valley | £37 | £261 |
| Underpin A Building near Romsey | £32 | £230 |
| Underpin A Building near New Forest | £32 | £245 |
| Underpin A Building near Andover | £40 | £248 |
| Underpin A Building near Totton | £34 | £243 |
| Underpin A Building near Chandler's Ford | £34 | £245 |
| Underpin A Building near Eastleigh | £34 | £244 |
| Underpin A Building near Devizes | £32 | £242 |
| Underpin A Building near Southampton | £34 | £243 |
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 - £17,445

Two storey extension - £87,917

Build a timber frame extension - £25,945

Build a swimming pool - £80,945

Single storey extension - £53,896

Side return extension - £40,879

Install an RSJ - £2,145

Outbuilding - £9,945

Build a Mansard loft conversion - £51,945

Loft conversion - £33,233

Build a kitchen extension - £41,945

Hip to gable loft conversion - £41,945

Granny annexe - £86,945

Garden office - £9,945

Convert a Garage - £15,945

Garage - £18,445

Build a flat roof extension - £21,945

Build a dormer loft conversion - £41,945

Concrete foundations - £6,195

Convert a bungalow loft - £28,945

Convert a basement - £36,879