From £17,836
Relax... you have found a reliable extension builder in HP8. J MCNAMEE J & J BUILDERS is a friendly and reliable company based in HP8 who consider ...
From £17,788
Welcome to Velonia interiors Ltd my name is James Martin and I’m the director myself and my team have many years experience I will use subcontrac...
From £17,716
We are passionate about building bespoke homes using quality products that create unique features both internally and externally.
From £17,844
Be Illuminated are here to help customers who need an Extension Builder in HP8. We offer a competitive rate to complete all your extension builderi...
From £18,356
KATELL PROPERTY MAINTENANCE is a trusted extension builder serving customers in HP8 and the surrounding area. Contact us to today to get a competit...
From £17,676
Beech is an established and experienced local extension builder in HP8. Please contact us for a free, no obligation quote and competitive rates. Co...
From £17,852
Distinct Build Ltd. has been built purely on referrals. We care about our client's ideas and needs and work tirelessly to deliver their dreams.
...From £17,652
Hamilton Refurbishments is an established and experienced local extension builder in HP8. Please contact us for a free, no obligation quote and com...
From £17,756
Need an Extension Builder in HP8? Mitre Peak Lofts Ltd has been helping local clients (10 mile radius) with their extension buildering jobs for man...
From £17,740
CONSIDERATE BUILDING LIMITED are here to help customers who need an Extension Builder in HP8. We offer a competitive rate to complete all your exte...

Underpinning ranges from £17,652 (Hamilton Refurbishments based in WD3) to £18,356 (KATELL PROPERTY MAINTENANCE based in WD3), 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 HP8 by posting a job with HaMuch and we will send it to extension builders in HP8.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Gerrards Cross | £43 | £282 |
| Underpin A Building near Rickmansworth | £42 | £278 |
| Underpin A Building near Chesham | £42 | £277 |
| Underpin A Building near Hazlemere | £40 | £272 |
| Underpin A Building near Watford | £43 | £278 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near Hillingdon | £62 | £276 |
| Underpin A Building near Berkhamsted | £41 | £263 |
| Underpin A Building near Hemel Hempstead | £42 | £270 |
| Underpin A Building near High Wycombe | £39 | £272 |
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 - £17,822

Two storey extension - £88,482

Build a timber frame extension - £26,322

Build a swimming pool - £81,322

Single storey extension - £61,432

Side return extension - £45,118

Install an RSJ - £2,522

Outbuilding - £10,322

Build a Mansard loft conversion - £52,322

Loft conversion - £36,765

Build a kitchen extension - £42,322

Hip to gable loft conversion - £42,322

Granny annexe - £87,322

Garden office - £10,322

Convert a Garage - £16,322

Garage - £18,822

Build a flat roof extension - £22,322

Build a dormer loft conversion - £42,322

Concrete foundations - £6,572

Convert a bungalow loft - £29,322

Convert a basement - £41,118