From £17,540
Been in the trade for over 30 yrs and take pride in my work. Fully insured and references both trade and private available
From £17,476
O NEILL CONSTRUCTION LTD is an established extension buildering business in PO14. We come highly recommended and provide competitive quotes for you...
From £17,284
NICK SMITH BUILDERS is an established extension buildering business in PO14. We come highly recommended and provide competitive quotes for your wor...
From £17,684
Stubbington Roofing Ltd. is an established extension buildering business in PO14. We come highly recommended and provide competitive quotes for you...
From £17,500
We are experts in cavity wall insulation, cavity wall insulation removal, loft insulation, loft boarding, room in roof insulation, chemical damp pr...
From £17,428
Relax... you have found a reliable extension builder in PO14. MA Builders is a friendly and reliable company based in PO14 who consider no job as t...
From £17,588
Relax... you have found a reliable extension builder in PO14. BRIAN NEWLYN BUILDERS is a friendly and reliable company based in PO14 who consider n...
From £17,484
Trusted and professional extension builder in PO14. Experienced in all extension buildering work and keeping within budget and on quote. DAVE HARRI...
From £17,692
Trusted and professional extension builder in PO14. Experienced in all extension buildering work and keeping within budget and on quote. A W PAVING...
From £17,436
Trusted and professional extension builder in PO14. Experienced in all extension buildering work and keeping within budget and on quote. J.Roberts ...

Underpinning ranges from £17,284 (NICK SMITH BUILDERS based in PO15) to £17,692 (A W PAVING LTD based in SO31), 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 PO14 by posting a job with HaMuch and we will send it to extension builders in PO14.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| 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 Gosport | £35 | £246 |
| Underpin A Building near Portsmouth | £36 | £250 |
| Underpin A Building near Hedge End | £34 | £244 |
| Underpin A Building near Waterlooville | £36 | £250 |
| Underpin A Building near Southampton | £34 | £243 |
| Underpin A Building near Horndean | £35 | £253 |
| Underpin A Building near Havant & Waterloo | £35 | £248 |
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 - £17,511

Two storey extension - £88,017

Build a timber frame extension - £26,011

Build a swimming pool - £81,011

Single storey extension - £55,224

Side return extension - £41,626

Install an RSJ - £2,211

Outbuilding - £10,011

Build a Mansard loft conversion - £52,011

Loft conversion - £33,855

Build a kitchen extension - £42,011

Hip to gable loft conversion - £42,011

Granny annexe - £87,011

Garden office - £10,011

Convert a Garage - £16,011

Garage - £18,511

Build a flat roof extension - £22,011

Build a dormer loft conversion - £42,011

Concrete foundations - £6,261

Convert a bungalow loft - £29,011

Convert a basement - £37,626