From £17,444
STYLE BUILDING SERVICES LTD are here to help customers who need an Extension Builder in Welwyn Garden City. We offer a competitive rate to complete...
From £17,924
Wiemy jak wa?n? decyzj? dla naszych Klientów jest budowa kupno czy remont domu, dlatego stawiamy na nowoczesne i ekonomiczne rozwi?zania , a ca?? ...
From £17,668
LBH Building & Property Services are here to help customers who need an Extension Builder in Welwyn Garden City. We offer a competitive rate to com...
From £17,980
We offer an extensive building service including a turnkey solution. We are experts in residential extensions, alterations and new builds in the He...
From £17,900
J&R Property is an established and experienced local extension builder in Welwyn Garden City. Please contact us for a free, no obligation quote and...
From £16,820
Complex Construction is an established extension buildering business in Welwyn Garden City. We come highly recommended and provide competitive quot...
From £17,708
NJG BUILDING SOLUTIONS LTD is an established and experienced local extension builder in Welwyn Garden City. Please contact us for a free, no obliga...
From £17,684
Lemsford Building is a trusted extension builder serving customers in Welwyn Garden City and the surrounding area. Contact us to today to get a com...
From £17,852
Trusted and professional extension builder in Welwyn Garden City. Experienced in all extension buildering work and keeping within budget and on quo...

Underpinning ranges from £16,820 (Complex Construction based in AL7) to £17,980 (Herts Premier Builders based in AL7), 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 Welwyn Garden City by posting a job with HaMuch and we will send it to extension builders in Welwyn Garden City.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Welwyn Garden City | £42 | £268 |
| Underpin A Building near Hatfield | £64 | £283 |
| Underpin A Building near Hertford | £46 | £289 |
| Underpin A Building near Potters Bar | £43 | £273 |
| Underpin A Building near Harpenden | £86 | £315 |
| Underpin A Building near St Albans | £63 | £288 |
| Underpin A Building near Ware | £47 | £296 |
| Underpin A Building near Cheshunt | £48 | £285 |
| Underpin A Building near Stevenage | £44 | £282 |
| Underpin A Building near Hoddesdon | £46 | £296 |
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 - £17,637

Two storey extension - £88,205

Build a timber frame extension - £26,137

Build a swimming pool - £81,137

Single storey extension - £57,736

Side return extension - £43,039

Install an RSJ - £2,337

Outbuilding - £10,137

Build a Mansard loft conversion - £52,137

Loft conversion - £35,033

Build a kitchen extension - £42,137

Hip to gable loft conversion - £42,137

Granny annexe - £87,137

Garden office - £10,137

Convert a Garage - £16,137

Garage - £18,637

Build a flat roof extension - £22,137

Build a dormer loft conversion - £42,137

Concrete foundations - £6,387

Convert a bungalow loft - £29,137

Convert a basement - £39,039