From £17,692
TCL BUILDING SOLUTIONS LTD are here to help customers who need an Extension Builder in SG18. We offer a competitive rate to complete all your exten...
From £17,668
Relax... you have found a reliable extension builder in SG18. Imogen Jack is a friendly and reliable company based in SG18 who consider no job as t...
From £17,636
Trusted and professional extension builder in SG18. Experienced in all extension buildering work and keeping within budget and on quote. J. WATSON ...
From £17,348
Need an Extension Builder in SG18? R&J Building Services Ltd has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £17,620
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...
From £17,764
Relax... you have found a reliable extension builder in SG18. Applewood Design and Build Ltd is a friendly and reliable company based in SG18 who c...
From £17,812
Experienced extension builder ready to quote for your work. Bricklayers is the best extension builder in SG18. No obligation free quotes and many h...
From £17,860
Experienced extension builder ready to quote for your work. Specialist Building Refurbishm is the best extension builder in SG18. No obligation fre...
From £17,788
Realise Your Luxury Dream Home With The Design And Build Partner You Can Trust.At MG Design & Build we have over 25 years of experience in the cons...
From £17,644
A.S. OHM Electrics Ltd is a trusted extension builder serving customers in SG18 and the surrounding area. Contact us to today to get a competitive ...

Underpinning ranges from £17,348 (R&J Building Services Ltd based in SG17) to £17,860 (Specialist Building Refurbishm based in SG16), 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 SG18 by posting a job with HaMuch and we will send it to extension builders in SG18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Biggleswade | £41 | £268 |
| Underpin A Building near Letchworth | £44 | £283 |
| Underpin A Building near North Hertfordshire | £44 | £283 |
| Underpin A Building near Kempston | £44 | £273 |
| Underpin A Building near South Bedfordshire | £45 | £278 |
| Underpin A Building near Bedford | £45 | £278 |
| Underpin A Building near Mid Bedfordshire | £42 | £276 |
| Underpin A Building near Ampthill | £38 | £258 |
| Underpin A Building near St Neots | £51 | £318 |
| Underpin A Building near Hitchin | £43 | £283 |
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 - £17,683

Two storey extension - £88,275

Build a timber frame extension - £26,183

Build a swimming pool - £81,183

Single storey extension - £58,664

Side return extension - £43,561

Install an RSJ - £2,383

Outbuilding - £10,183

Build a Mansard loft conversion - £52,183

Loft conversion - £35,468

Build a kitchen extension - £42,183

Hip to gable loft conversion - £42,183

Granny annexe - £87,183

Garden office - £10,183

Convert a Garage - £16,183

Garage - £18,683

Build a flat roof extension - £22,183

Build a dormer loft conversion - £42,183

Concrete foundations - £6,433

Convert a bungalow loft - £29,183

Convert a basement - £39,561