Trusted and professional extension builder in Letchworth. Experienced in all extension buildering work and keeping within budget and on quote. Amce...
Letchworth, SG6
Need an Extension Builder in Letchworth? WILLMOTT DIXON CONSTRUCTION LI has been helping local clients (20 mile radius) with their extension builde...
Experienced extension builder ready to quote for your work. HB Construction is the best extension builder in Letchworth. No obligation free quotes ...
Need an Extension Builder in Letchworth? R&J Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering ...
In an unstable market house extensions are often the most viable option, helping you to get the most out of the space you have without the addition...
Gary Braine
Experienced extension builder ready to quote for your work. G B BUILDSTORE LTD is the best extension builder in Letchworth. No obligation free quot...
Letchworth, SG6
Need an Extension Builder in Letchworth? M SPINDLER CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension builderin...
TCL BUILDING SOLUTIONS LTD are here to help customers who need an Extension Builder in Letchworth. We offer a competitive rate to complete all your...
From £17,956
Steve Rolt Home Improvements Ltd was founded in 2016 in Buntingford, Hertfordshire, and from small beginnings, has gone from stren...
From £17,620
James Hogbourne
For more than 10 years, North Hertfordshire Construction LTD have been the name you can trust when it comes to building and development! We are kno...

Underpinning ranges from £17,348 (R&J Building Services Ltd based in SG17) to £17,988 (M SPINDLER CONSTRUCTION LTD based in SG6), 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 Letchworth by posting a job with HaMuch and we will send it to extension builders in Letchworth.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Letchworth | £44 | £283 |
| Underpin A Building near North Hertfordshire | £44 | £283 |
| Underpin A Building near Hitchin | £43 | £283 |
| Underpin A Building near Stevenage | £44 | £282 |
| Underpin A Building near Biggleswade | £41 | £268 |
| Underpin A Building near East Hertfordshire | £44 | £289 |
| Underpin A Building near Mid Bedfordshire | £42 | £276 |
| Underpin A Building near Luton | £42 | £279 |
| Underpin A Building near Ampthill | £38 | £258 |
| Underpin A Building near Harpenden | £87 | £317 |
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 - £17,705

Two storey extension - £88,307

Build a timber frame extension - £26,205

Build a swimming pool - £81,205

Single storey extension - £59,096

Side return extension - £43,804

Install an RSJ - £2,405

Outbuilding - £10,205

Build a Mansard loft conversion - £52,205

Loft conversion - £35,670

Build a kitchen extension - £42,205

Hip to gable loft conversion - £42,205

Granny annexe - £87,205

Garden office - £10,205

Convert a Garage - £16,205

Garage - £18,705

Build a flat roof extension - £22,205

Build a dormer loft conversion - £42,205

Concrete foundations - £6,455

Convert a bungalow loft - £29,205

Convert a basement - £39,804