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Available extension builders in Northamptonshire reply
Select your affordable Northamptonshire extension builder
Trusted and professional extension builder in Northamptonshire. Experienced in all extension buildering work and keeping within budget and on quote...
From £17,228
Ken Burton
Experienced house builder. Eco structures from Denmark as well as conventional build. Extensions. Bathrooms. Kitchens and support steels when requi...
From £17,116
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,260
Experienced extension builder ready to quote for your work. BHM Leicester is the best extension builder in Northamptonshire. No obligation free 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...
From £16,972
Northamptonshire, NN17
Ascot Property Solutions Limited is an established and experienced local extension builder in Northamptonshire. Please contact us for a free, no ob...
From £17,100
Northamptonshire, NN6
New Revival - Construction Management is a trusted extension builder serving customers in Northamptonshire and the surrounding area. Contact us to ...

Underpinning ranges from £16,972 (Ascot Property Solutions Limited based in NN17) to £17,260 (BHM Leicester based in LE8), 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 Northamptonshire by posting a job with HaMuch and we will send it to extension builders in Northamptonshire.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Market Harborough | £31 | £217 |
| Underpin A Building near Corby | £30 | £214 |
| Underpin A Building near Kettering | £34 | £237 |
| Underpin A Building near Wigston | £28 | £210 |
| Underpin A Building near Oadby | £28 | £207 |
| Underpin A Building near Hamilton | £29 | £213 |
| Underpin A Building near Leicester | £29 | £213 |
| Underpin A Building near Wellingborough | £39 | £251 |
| Underpin A Building near Northampton | £35 | £239 |
| Underpin A Building near Rugby | £31 | £224 |
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 - £17,142

Two storey extension - £87,463

Build a timber frame extension - £25,642

Build a swimming pool - £80,642

Single storey extension - £47,846

Side return extension - £37,476

Install an RSJ - £1,842

Outbuilding - £9,642

Build a Mansard loft conversion - £51,642

Loft conversion - £30,396

Build a kitchen extension - £41,642

Hip to gable loft conversion - £41,642

Granny annexe - £86,642

Garden office - £9,642

Convert a Garage - £15,642

Garage - £18,142

Build a flat roof extension - £21,642

Build a dormer loft conversion - £41,642

Concrete foundations - £5,892

Convert a bungalow loft - £28,642

Convert a basement - £33,476