From £18,596
We are a Small Family run business with over 30 years experience in the building trade, Carpentry is my main trade, with NVQ Level 2.
From £17,644
We are a small family run business with over 20 years experience in brickwork, bathroom/kitchen fitting, roofing, landscaping, fencing, tiling and ...
From £17,252
Park Building Services Ltd is a trusted extension builder serving customers in SO18 and the surrounding area. Contact us to today to get a competit...
From £17,268
TP Developments are here to help customers who need an Extension Builder in SO18. We offer a competitive rate to complete all your extension builde...
From £17,644
Bailey Construction Services are here to help customers who need an Extension Builder in SO18. We offer a competitive rate to complete all your ext...
From £17,252
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,620
Need to find an Extension Builder near you for all your extension buildering work?
Mobile Services provides a local, trusted extension buil...
From £17,692
We are a Design and Build company based in Hampshire. Proud of our roots, we try to be the very best in the way we go about our business. Friendly...
From £17,636
Claytons Building and Roofing are here to help customers who need an Extension Builder in SO18. We offer a competitive rate to complete all your ex...
From £17,460
ROB DINE CONSTRUCTION is an established and experienced local extension builder in SO18. Please contact us for a free, no obligation quote and comp...

Underpinning ranges from £17,252 (Park Building Services Ltd based in PO9) to £18,596 (R&B Property Improvements based in PO9), 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 SO18 by posting a job with HaMuch and we will send it to extension builders in SO18.
"Underpinning" - SOUTHAMPTON, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Southampton | £34 | £243 |
| Underpin A Building near Hedge End | £34 | £244 |
| Underpin A Building near Eastleigh | £34 | £244 |
| Underpin A Building near Chandler's Ford | £34 | £245 |
| Underpin A Building near Locks Heath | £33 | £240 |
| Underpin A Building near Totton | £34 | £243 |
| Underpin A Building near Romsey | £32 | £230 |
| Underpin A Building near Fareham | £35 | £250 |
| Underpin A Building near Winchester | £37 | £266 |
| Underpin A Building near Lee-on-the-Solent | £35 | £249 |
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 - £17,606

Two storey extension - £88,160

Build a timber frame extension - £26,106

Build a swimming pool - £81,106

Single storey extension - £57,128

Side return extension - £42,697

Install an RSJ - £2,306

Outbuilding - £10,106

Build a Mansard loft conversion - £52,106

Loft conversion - £34,748

Build a kitchen extension - £42,106

Hip to gable loft conversion - £42,106

Granny annexe - £87,106

Garden office - £10,106

Convert a Garage - £16,106

Garage - £18,606

Build a flat roof extension - £22,106

Build a dormer loft conversion - £42,106

Concrete foundations - £6,356

Convert a bungalow loft - £29,106

Convert a basement - £38,697