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Select your affordable NN1 extension builder
Alan Hicks
Need to find an Extension Builder near you for all your extension buildering work?
A G Hicks Building Services provides a local, trusted ex...
Need to find an Extension Builder near you for all your extension buildering work?
Picking your Local Builder provides a local, trusted ext...
Trusted and professional extension builder in NN1. Experienced in all extension buildering work and keeping within budget and on quote. Northants G...
M Home Renovations is an established extension buildering business in NN1. We come highly recommended and provide competitive quotes for your work....
Walsh Builders Ltd is an established and experienced local extension builder in NN1. Please contact us for a free, no obligation quote and competit...
Need an Extension Builder in NN1? Twelftree Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many ...
Relax... you have found a reliable extension builder in NN1. Wright Building is a friendly and reliable company based in NN1 who consider no job as...
Need an Extension Builder in NN1? DAB & K&G Building Services has been helping local clients (20 mile radius) with their extension buildering jobs ...
Samrai Associates was founded by Hars Samrai in Northampton in order to provide clients with a prompt and robust Architectural Service. Over time m...
Need an Extension Builder in NN1? Catling Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering job...

Underpinning ranges from £17,044 (A G Hicks Building Services based in NN3) to £17,748 (Samrai Associates Limited based in NN3), 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 NN1 by posting a job with HaMuch and we will send it to extension builders in NN1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Northampton | £35 | £239 |
| Underpin A Building near Wellingborough | £39 | £251 |
| Underpin A Building near Daventry | £31 | £230 |
| Underpin A Building near Rushden | £34 | £231 |
| Underpin A Building near Kettering | £34 | £237 |
| Underpin A Building near Milton Keynes | £39 | £263 |
| Underpin A Building near Market Harborough | £31 | £217 |
| Underpin A Building near Rugby | £31 | £224 |
| Underpin A Building near Bletchley | £39 | £265 |
| Underpin A Building near South Bedfordshire | £45 | £278 |
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 - £17,417

Two storey extension - £87,875

Build a timber frame extension - £25,917

Build a swimming pool - £80,917

Single storey extension - £53,336

Side return extension - £40,564

Install an RSJ - £2,117

Outbuilding - £9,917

Build a Mansard loft conversion - £51,917

Loft conversion - £32,970

Build a kitchen extension - £41,917

Hip to gable loft conversion - £41,917

Granny annexe - £86,917

Garden office - £9,917

Convert a Garage - £15,917

Garage - £18,417

Build a flat roof extension - £21,917

Build a dormer loft conversion - £41,917

Concrete foundations - £6,167

Convert a bungalow loft - £28,917

Convert a basement - £36,564