From £16,908
We have a great team behind us, we offer friendly, competitive and professional service. With years of experience among the trades, there's not muc...
From £17,364
Walsh Builders Ltd is an established and experienced local extension builder in NN2. Please contact us for a free, no obligation quote and competit...
From £17,116
Brickwork specialist with 30 years experience.
From repointing, small repairs up to building extensions and houses.
Stonework...
From £17,100
M Home Renovations is an established extension buildering business in NN2. We come highly recommended and provide competitive quotes for your work....
From £17,436
L.D.Design&Build means a holistic approach to building, one simple way of finding everything you need for your building project under the ‘same r...
From £17,372
Need an Extension Builder in NN2? DAB & K&G Building Services has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £17,188
Experienced extension builder ready to quote for your work. Reco life is the best extension builder in NN2. No obligation free quotes and many happ...
From £17,748
Samrai Associates was founded by Hars Samrai in Northampton in order to provide clients with a prompt and robust Architectural Service. Over time m...
From £17,428
Fountain Construction Ltd is an established and experienced local extension builder in NN2. Please contact us for a free, no obligation quote and c...
From £17,692
Relax... you have found a reliable extension builder in NN2. Wright Building is a friendly and reliable company based in NN2 who consider no job as...

Underpinning ranges from £16,908 (Artizan Roofing based in NN2) 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 NN2 by posting a job with HaMuch and we will send it to extension builders in NN2.
| 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 Kettering | £34 | £237 |
| Underpin A Building near Rushden | £34 | £231 |
| Underpin A Building near Market Harborough | £31 | £217 |
| Underpin A Building near Milton Keynes | £39 | £263 |
| Underpin A Building near Rugby | £31 | £224 |
| Underpin A Building near Corby | £30 | £214 |
| 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 - £17,335

Two storey extension - £87,753

Build a timber frame extension - £25,835

Build a swimming pool - £80,835

Single storey extension - £51,704

Side return extension - £39,646

Install an RSJ - £2,035

Outbuilding - £9,835

Build a Mansard loft conversion - £51,835

Loft conversion - £32,205

Build a kitchen extension - £41,835

Hip to gable loft conversion - £41,835

Granny annexe - £86,835

Garden office - £9,835

Convert a Garage - £15,835

Garage - £18,335

Build a flat roof extension - £21,835

Build a dormer loft conversion - £41,835

Concrete foundations - £6,085

Convert a bungalow loft - £28,835

Convert a basement - £35,646