Peter Rourke
Trusted and professional extension builder in AL5. Experienced in all extension buildering work and keeping within budget and on quote. Peter's Gut...
Are you looking for resin driveways in North London? We are a leading builder of driveways and patios in North London. We have expertise in various...
From £17,484
Nicholas Bilyk
Abalon is Western Canada’s leading foundation repair and basement waterproofing company, operating in the Edmonton area for over 40 years (50 yea...
From £17,900
Bob Gordon
Bob's Home Maintenance are here to help customers who need an Extension Builder in AL5. We offer a competitive rate to complete all your extension ...
From £17,772
Bernard Priolo
Experienced extension builder ready to quote for your work. Priolotiling is the best extension builder in AL5. No obligation free quotes and many h...
From £18,068
Experienced extension builder ready to quote for your work. Ashtons is the best extension builder in AL5. No obligation free quotes and many happy ...
From £17,812
Trusted and professional extension builder in AL5. Experienced in all extension buildering work and keeping within budget and on quote. Home By Sim...
From £17,612
4siblings are here to help customers who need an Extension Builder in AL5. We offer a competitive rate to complete all your extension buildering jo...
From £17,564
We pride ourselves in offering transparent, collaborative construction services, defining your project, through planning and taking your project t...
From £18,028
Billy Homan set up Grain Property to provide high-quality design, seamless project delivery, and a commitment to excellent communication throughout...

Underpinning ranges from £17,484 (Abalon Construction based in ZZ99) to £18,068 (Ashtons based in Al5), 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 AL5 by posting a job with HaMuch and we will send it to extension builders in AL5.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Harpenden | £87 | £317 |
| Underpin A Building near St Albans | £63 | £289 |
| Underpin A Building near Luton | £42 | £279 |
| Underpin A Building near Hatfield | £65 | £285 |
| Underpin A Building near Hemel Hempstead | £42 | £270 |
| Underpin A Building near Welwyn Garden City | £42 | £269 |
| Underpin A Building near Dacorum | £42 | £269 |
| Underpin A Building near Hitchin | £43 | £283 |
| Underpin A Building near Dunstable | £41 | £274 |
| Underpin A Building near Stevenage | £44 | £282 |
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 - £17,812

Two storey extension - £88,468

Build a timber frame extension - £26,312

Build a swimming pool - £81,312

Single storey extension - £61,240

Side return extension - £45,010

Install an RSJ - £2,512

Outbuilding - £10,312

Build a Mansard loft conversion - £52,312

Loft conversion - £36,675

Build a kitchen extension - £42,312

Hip to gable loft conversion - £42,312

Granny annexe - £87,312

Garden office - £10,312

Convert a Garage - £16,312

Garage - £18,812

Build a flat roof extension - £22,312

Build a dormer loft conversion - £42,312

Concrete foundations - £6,562

Convert a bungalow loft - £29,312

Convert a basement - £41,010