From £17,940
IC Builders have been helping customers in St Albans and the surrounding area by providing professional, trustworthy building services.We k...
From £17,820
Relax... you have found a reliable extension builder in St Albans. Designer Shade Solutions is a friendly and reliable company based in St Albans w...
From £17,740
Beswick Building and Renovations LTD is a trusted extension builder serving customers in St Albans and the surrounding area. Contact us to today to...
From £17,740
JAS Housing Developments is an established and experienced local extension builder in St Albans. Please contact us for a free, no obligation quote ...
From £17,780
Need to find an Extension Builder near you for all your extension buildering work?
JGS Building Ltd provides a local, trusted extension bui...
From £17,980
Building services company Renospace was established in 2000. Since then we have been helping customers in Hertfordshire and the surrounding area by...
From £17,580
Trusted and professional extension builder in St Albans. Experienced in all extension buildering work and keeping within budget and on quote. P & A...
From £17,644
Relax... you have found a reliable extension builder in St Albans. DK Home Refurbishment Limited is a friendly and reliable company based in St Alb...
From £17,636
Relax... you have found a reliable extension builder in St Albans. Property Interior Services is a friendly and reliable company based in St Albans...

Underpinning ranges from £17,524 (Planson’s Building Services based in AL1) to £17,980 (RenoSpace based in AL3), 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 St Albans by posting a job with HaMuch and we will send it to extension builders in St Albans.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near St Albans | £63 | £288 |
| Underpin A Building near Harpenden | £86 | £315 |
| Underpin A Building near Hatfield | £64 | £283 |
| Underpin A Building near Hemel Hempstead | £42 | £270 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near Borehamwood | £42 | £270 |
| Underpin A Building near Welwyn Garden City | £42 | £268 |
| Underpin A Building near Bushey | £42 | £276 |
| Underpin A Building near Watford | £43 | £278 |
| Underpin A Building near Potters Bar | £43 | £273 |
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 - £17,738

Two storey extension - £88,358

Build a timber frame extension - £26,238

Build a swimming pool - £81,238

Single storey extension - £59,768

Side return extension - £44,182

Install an RSJ - £2,438

Outbuilding - £10,238

Build a Mansard loft conversion - £52,238

Loft conversion - £35,985

Build a kitchen extension - £42,238

Hip to gable loft conversion - £42,238

Granny annexe - £87,238

Garden office - £10,238

Convert a Garage - £16,238

Garage - £18,738

Build a flat roof extension - £22,238

Build a dormer loft conversion - £42,238

Concrete foundations - £6,488

Convert a bungalow loft - £29,238

Convert a basement - £40,182