From £17,260
M B Brickwork is an established extension buildering business in PO6. We come highly recommended and provide competitive quotes for your work.
...From £17,628
Relax... you have found a reliable extension builder in PO6. SLG Mills Building Services is a friendly and reliable company based in PO6 who consid...
From £17,604
As a family owned limited company of over 40 years, our focus on quality and service has seen our business thrive and grow, solely through recommen...
From £17,228
Experienced extension builder ready to quote for your work. A G Builders is the best extension builder in PO6. No obligation free quotes and many h...
From £17,500
Build Light Group is an established and experienced local extension builder in PO6. Please contact us for a free, no obligation quote and competiti...
From £17,484
Sigma Probuild Ltd is an established extension buildering business in PO6. We come highly recommended and provide competitive quotes for your work....
From £17,324
Relax... you have found a reliable extension builder in PO6. Bribern Property Services is a friendly and reliable company based in PO6 who consider...
From £17,284
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,300
Need to find an Extension Builder near you for all your extension buildering work?
DC Roofing & Sons Ltd provides a local, trusted extensio...
From £17,212
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £17,212 (Westcott Construction Ltd based in PO3) to £17,628 (SLG Mills Building Services based in PO7), 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 PO6 by posting a job with HaMuch and we will send it to extension builders in PO6.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Portsmouth | £36 | £250 |
| Underpin A Building near Waterlooville | £36 | £250 |
| Underpin A Building near Havant & Waterloo | £35 | £248 |
| Underpin A Building near Havant | £35 | £249 |
| Underpin A Building near Gosport | £35 | £246 |
| Underpin A Building near Horndean | £35 | £253 |
| Underpin A Building near Fareham | £35 | £250 |
| Underpin A Building near Lee-on-the-Solent | £35 | £249 |
| Underpin A Building near Locks Heath | £33 | £240 |
| Underpin A Building near Hedge End | £34 | £244 |
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 - £17,382

Two storey extension - £87,824

Build a timber frame extension - £25,882

Build a swimming pool - £80,882

Single storey extension - £52,648

Side return extension - £40,177

Install an RSJ - £2,082

Outbuilding - £9,882

Build a Mansard loft conversion - £51,882

Loft conversion - £32,648

Build a kitchen extension - £41,882

Hip to gable loft conversion - £41,882

Granny annexe - £86,882

Garden office - £9,882

Convert a Garage - £15,882

Garage - £18,382

Build a flat roof extension - £21,882

Build a dormer loft conversion - £41,882

Concrete foundations - £6,132

Convert a bungalow loft - £28,882

Convert a basement - £36,177