From £17,284
NICK SMITH BUILDERS is an established extension buildering business in PO17. We come highly recommended and provide competitive quotes for your wor...
From £17,484
Trusted and professional extension builder in PO17. Experienced in all extension buildering work and keeping within budget and on quote. DAVE HARRI...
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 £17,580
Need an Extension Builder in PO17? WINSOR CONSTRUCTION has been helping local clients (20 mile radius) with their extension buildering jobs for man...
From £17,684
Stubbington Roofing Ltd. is an established extension buildering business in PO17. We come highly recommended and provide competitive quotes for you...
From £17,900
Cripps property services has 18 years experience in the construction industry and specializes in many different categories from bathrooms, heating,...
From £17,236
Hi my name is Steve harris of hb builders we are based in portchester and have over 40 years of experience in the building trade we would be mor...
From £17,804
Thermic Homes is an energy-saving home improvement company operating out of the south coast of England. Our mission is to create warmer homes for t...
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 PO17. MA Builders is a friendly and reliable company based in PO17 who consider no job as t...

Underpinning ranges from £17,236 (H B Builders based in PO16) to £17,900 (Cripps Property Services based in PO16), 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 PO17 by posting a job with HaMuch and we will send it to extension builders in PO17.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Fareham | £31 | £217 |
| Underpin A Building near Locks Heath | £30 | £213 |
| Underpin A Building near Portsmouth | £31 | £216 |
| Underpin A Building near Waterlooville | £31 | £213 |
| Underpin A Building near Lee-on-the-Solent | £31 | £217 |
| Underpin A Building near Hedge End | £30 | £215 |
| Underpin A Building near Gosport | £30 | £215 |
| Underpin A Building near Horndean | £30 | £213 |
| Underpin A Building near Havant | £30 | £213 |
| Underpin A Building near Havant & Waterloo | £30 | £213 |
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 - £17,544

Two storey extension - £88,066

Build a timber frame extension - £26,044

Build a swimming pool - £81,044

Single storey extension - £55,880

Side return extension - £41,995

Install an RSJ - £2,244

Outbuilding - £10,044

Build a Mansard loft conversion - £52,044

Loft conversion - £34,163

Build a kitchen extension - £42,044

Hip to gable loft conversion - £42,044

Granny annexe - £87,044

Garden office - £10,044

Convert a Garage - £16,044

Garage - £18,544

Build a flat roof extension - £22,044

Build a dormer loft conversion - £42,044

Concrete foundations - £6,294

Convert a bungalow loft - £29,044

Convert a basement - £37,995