From £17,396
Simon Johnson & Sons Builders are here to help customers who need an Extension Builder in HP2. We offer a competitive rate to complete all your ext...
From £17,748
Relax... you have found a reliable extension builder in HP2. R KENT BUILDERS is a friendly and reliable company based in HP2 who consider no job as...
From £17,612
Need to find an Extension Builder near you for all your extension buildering work?
AUBREY BUILDING SERVICES LTD provides a local, trusted e...
From £17,500
Member since July 2020
EB Construction & Building Ltd are here to help customers who need an Extension Builder in HP2. We offer a competitive rate to complete all your ex...
From £17,980
R Gabriel Carpentry & Builders is a trusted extension builder serving customers in HP2 and the surrounding area. Contact us to today to get a compe...
From £17,580
WHITE HART BUILDING LIMITED is a trusted extension builder serving customers in HP2 and the surrounding area. Contact us to today to get a competit...
From £18,060
At LUXE DESIGN & BUILD LTD, we’ve been helping others grow for more than 10 years. And in the process, we’ve grown a bit ourselves. Years of wo...
From £17,820
We specialize in complete house refurbishments ,home extensions ,loft conversions , structural works etc. we also offer design and built services t...
From £17,436
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,652
JH Refurbishments are here to help customers who need an Extension Builder in HP2. We offer a competitive rate to complete all your extension build...

Underpinning ranges from £17,396 (Simon Johnson & Sons Builders based in HP2) to £18,060 (Luxe Design & Build Ltd based in HP2), 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 HP2 by posting a job with HaMuch and we will send it to extension builders in HP2.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Hemel Hempstead | £42 | £270 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near St Albans | £63 | £288 |
| Underpin A Building near Berkhamsted | £41 | £263 |
| Underpin A Building near Harpenden | £86 | £315 |
| Underpin A Building near Chesham | £42 | £277 |
| Underpin A Building near Luton | £42 | £276 |
| Underpin A Building near Rickmansworth | £42 | £278 |
| Underpin A Building near Watford | £43 | £278 |
| Underpin A Building near Dunstable | £41 | £270 |
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 - £17,678

Two storey extension - £88,268

Build a timber frame extension - £26,178

Build a swimming pool - £81,178

Single storey extension - £58,568

Side return extension - £43,507

Install an RSJ - £2,378

Outbuilding - £10,178

Build a Mansard loft conversion - £52,178

Loft conversion - £35,423

Build a kitchen extension - £42,178

Hip to gable loft conversion - £42,178

Granny annexe - £87,178

Garden office - £10,178

Convert a Garage - £16,178

Garage - £18,678

Build a flat roof extension - £22,178

Build a dormer loft conversion - £42,178

Concrete foundations - £6,428

Convert a bungalow loft - £29,178

Convert a basement - £39,507