From £17,676
Experienced extension builder ready to quote for your work. HOLLYBANK BUILDING is the best extension builder in PO10. No obligation free quotes and...
From £17,284
Need an Extension Builder in PO10? CHT Building Solutions Ltd/Renaissance Orangeries has been helping local clients (20 mile radius) with their ext...
From £17,548
A T Holmes & Son Chimney Sweep is a trusted extension builder serving customers in PO10 and the surrounding area. Contact us to today to get a comp...
From £17,252
Park Building Services Ltd is a trusted extension builder serving customers in PO10 and the surrounding area. Contact us to today to get a competit...
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 £17,420
Need an Extension Builder in PO10? Aspen Garden Rooms has been helping local clients (20 mile radius) with their extension buildering jobs for many...
From £17,404
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,612
Solent Home Improvements are here to help customers who need an Extension Builder in PO10. We offer a competitive rate to complete all your extensi...
From £17,468
Solent Home Improvements are here to help customers who need an Extension Builder in PO10. We offer a competitive rate to complete all your extensi...
From £17,524
Relax... you have found a reliable extension builder in PO10. SYNERGY Home Renovations is a friendly and reliable company based in PO10 who conside...

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 PO10 by posting a job with HaMuch and we will send it to extension builders in PO10.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Havant & Waterloo | £35 | £248 |
| Underpin A Building near Havant | £35 | £249 |
| Underpin A Building near Waterlooville | £36 | £250 |
| Underpin A Building near Horndean | £35 | £253 |
| Underpin A Building near Chichester | £34 | £242 |
| Underpin A Building near Portsmouth | £36 | £250 |
| Underpin A Building near Gosport | £35 | £246 |
| Underpin A Building near Fareham | £35 | £250 |
| Underpin A Building near Bognor Regis | £35 | £247 |
| 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 - £17,578

Two storey extension - £88,118

Build a timber frame extension - £26,078

Build a swimming pool - £81,078

Single storey extension - £56,568

Side return extension - £42,382

Install an RSJ - £2,278

Outbuilding - £10,078

Build a Mansard loft conversion - £52,078

Loft conversion - £34,485

Build a kitchen extension - £42,078

Hip to gable loft conversion - £42,078

Granny annexe - £87,078

Garden office - £10,078

Convert a Garage - £16,078

Garage - £18,578

Build a flat roof extension - £22,078

Build a dormer loft conversion - £42,078

Concrete foundations - £6,328

Convert a bungalow loft - £29,078

Convert a basement - £38,382