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 PO30 and the surrounding area. Contact us to today to get a competit...
From £17,644
Bailey Construction Services are here to help customers who need an Extension Builder in PO30. 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 £17,460
ROB DINE CONSTRUCTION is an established and experienced local extension builder in PO30. Please contact us for a free, no obligation quote and comp...
From £17,636
Claytons Building and Roofing are here to help customers who need an Extension Builder in PO30. We offer a competitive rate to complete all your ex...
From £17,692
Trusted and professional extension builder in PO30. Experienced in all extension buildering work and keeping within budget and on quote. A W PAVING...

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 PO30 by posting a job with HaMuch and we will send it to extension builders in PO30.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Isle of Wight | £34 | £246 |
| Underpin A Building near Ryde | £34 | £255 |
| Underpin A Building near Lee-on-the-Solent | £35 | £249 |
| Underpin A Building near Gosport | £35 | £246 |
| Underpin A Building near Locks Heath | £33 | £240 |
| Underpin A Building near Fareham | £35 | £250 |
| Underpin A Building near Portsmouth | £36 | £250 |
| Underpin A Building near Southampton | £34 | £243 |
| Underpin A Building near Hedge End | £34 | £244 |
| Underpin A Building near Totton | £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 - £17,649

Two storey extension - £88,223

Build a timber frame extension - £26,149

Build a swimming pool - £81,149

Single storey extension - £57,976

Side return extension - £43,174

Install an RSJ - £2,349

Outbuilding - £10,149

Build a Mansard loft conversion - £52,149

Loft conversion - £35,145

Build a kitchen extension - £42,149

Hip to gable loft conversion - £42,149

Granny annexe - £87,149

Garden office - £10,149

Convert a Garage - £16,149

Garage - £18,649

Build a flat roof extension - £22,149

Build a dormer loft conversion - £42,149

Concrete foundations - £6,399

Convert a bungalow loft - £29,149

Convert a basement - £39,174