From £17,748
RS Plumbing and Heating is a trusted extension builder serving customers in NN9 and the surrounding area. Contact us to today to get a competitive ...
From £17,948
Relax... you have found a reliable extension builder in NN9. Bench Mark Construction is a friendly and reliable company based in NN9 who consider n...
From £18,308
Need to find an Extension Builder near you for all your extension buildering work?
A M Interiors provides a local, trusted extension builde...
From £17,044
Need to find an Extension Builder near you for all your extension buildering work?
A G Hicks Building Services provides a local, trusted ex...
From £17,124
Trusted and professional extension builder in NN9. Experienced in all extension buildering work and keeping within budget and on quote. K FREEMAN B...
From £17,484
Need to find an Extension Builder near you for all your extension buildering work?
Picking your Local Builder provides a local, trusted ext...
From £17,404
Need to find an Extension Builder near you for all your extension buildering work?
THE DEARN BUILDING GROUP LTD provides a local, trusted e...
From £17,460
Trusted and professional extension builder in NN9. Experienced in all extension buildering work and keeping within budget and on quote. Northants G...
From £17,100
M Home Renovations is an established extension buildering business in NN9. We come highly recommended and provide competitive quotes for your work....
From £17,364
Walsh Builders Ltd is an established and experienced local extension builder in NN9. Please contact us for a free, no obligation quote and competit...

Underpinning ranges from £17,044 (A G Hicks Building Services based in NN3) to £18,308 (A M Interiors based in MK42), 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 NN9 by posting a job with HaMuch and we will send it to extension builders in NN9.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Rushden | £34 | £231 |
| Underpin A Building near Wellingborough | £39 | £251 |
| Underpin A Building near Kettering | £34 | £237 |
| Underpin A Building near Corby | £30 | £214 |
| Underpin A Building near Northampton | £35 | £239 |
| Underpin A Building near Bedford | £45 | £278 |
| Underpin A Building near South Bedfordshire | £45 | £278 |
| Underpin A Building near Kempston | £44 | £273 |
| Underpin A Building near St Neots | £51 | £318 |
| Underpin A Building near Huntingdonshire | £36 | £290 |
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 - £17,498

Two storey extension - £87,998

Build a timber frame extension - £25,998

Build a swimming pool - £80,998

Single storey extension - £54,968

Side return extension - £41,482

Install an RSJ - £2,198

Outbuilding - £9,998

Build a Mansard loft conversion - £51,998

Loft conversion - £33,735

Build a kitchen extension - £41,998

Hip to gable loft conversion - £41,998

Granny annexe - £86,998

Garden office - £9,998

Convert a Garage - £15,998

Garage - £18,498

Build a flat roof extension - £21,998

Build a dormer loft conversion - £41,998

Concrete foundations - £6,248

Convert a bungalow loft - £28,998

Convert a basement - £37,482