B GS GENERAL BUILDERS are here to help customers who need an Extension Builder in NN17. We offer a competitive rate to complete all your extension ...
From £16,972
Ascot Property Solutions Limited is an established and experienced local extension builder in NN17. Please contact us for a free, no obligation quo...
From £17,076
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,972 (Ascot Property Solutions Limited based in NN17) to £17,156 (B GS GENERAL BUILDERS based in NN17), 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 NN17 by posting a job with HaMuch and we will send it to extension builders in NN17.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Corby | £30 | £214 |
| Underpin A Building near Kettering | £34 | £237 |
| Underpin A Building near Market Harborough | £31 | £217 |
| Underpin A Building near Wellingborough | £39 | £251 |
| Underpin A Building near Stamford | £35 | £248 |
| Underpin A Building near Rushden | £34 | £231 |
| Underpin A Building near Wigston | £28 | £209 |
| Underpin A Building near Hamilton | £29 | £213 |
| Underpin A Building near Peterborough | £40 | £281 |
| Underpin A Building near Oadby | £28 | £207 |
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 - £17,068

Two storey extension - £87,352

Build a timber frame extension - £25,568

Build a swimming pool - £80,568

Single storey extension - £46,360

Side return extension - £36,640

Install an RSJ - £1,768

Outbuilding - £9,568

Build a Mansard loft conversion - £51,568

Loft conversion - £29,700

Build a kitchen extension - £41,568

Hip to gable loft conversion - £41,568

Granny annexe - £86,568

Garden office - £9,568

Convert a Garage - £15,568

Garage - £18,068

Build a flat roof extension - £21,568

Build a dormer loft conversion - £41,568

Concrete foundations - £5,818

Convert a bungalow loft - £28,568

Convert a basement - £32,640