From £17,604
DRUMKINNON JOINERY & BUILDING is a trusted extension builder serving customers in Dumbarton and the surrounding area. Contact us to today to get a ...
From £17,100
Trusted and professional extension builder in Dumbarton. Experienced in all extension buildering work and keeping within budget and on quote. CR Jo...
From £17,788
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,876
Experienced extension builder ready to quote for your work. Glencroft Builders Ltd is the best extension builder in Dumbarton. No obligation free q...
From £17,772
LOCHNAGAR CONSTRUCTION LTD is a trusted extension builder serving customers in Dumbarton and the surrounding area. Contact us to today to get a com...
From £17,636
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,628
LAKE BUILDERS LTD is an established extension buildering business in Dumbarton. We come highly recommended and provide competitive quotes for your ...
From £17,836
Greg Collins Joinery & Carpentry offers a range of serveries for home, business and commercial properties. I take a personal pride in my work ensur...
From £17,612
Need to find an Extension Builder near you for all your extension buildering work?
Price It Cost Consultants Ltd provides a local, trusted ...
From £17,580
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,876 (Glencroft Builders Ltd based in G81) to £17,836 (Greg Collins Carpentry and Joinery based in G61), 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 Dumbarton by posting a job with HaMuch and we will send it to extension builders in Dumbarton.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Dumbarton | £29 | £232 |
| Underpin A Building near Greenock | £30 | £243 |
| Underpin A Building near Port Glasgow | £32 | £250 |
| Underpin A Building near Erskine | £34 | £258 |
| Underpin A Building near Clydebank | £35 | £264 |
| Underpin A Building near Renfrewshire | £54 | £398 |
| Underpin A Building near Renfrew | £35 | £264 |
| Underpin A Building near Johnstone | £52 | £381 |
| Underpin A Building near Paisley | £34 | £259 |
| Underpin A Building near Bearsden | £34 | £262 |
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 - £17,543

Two storey extension - £88,065

Build a timber frame extension - £26,043

Build a swimming pool - £81,043

Single storey extension - £55,864

Side return extension - £41,986

Install an RSJ - £2,243

Outbuilding - £10,043

Build a Mansard loft conversion - £52,043

Loft conversion - £34,155

Build a kitchen extension - £42,043

Hip to gable loft conversion - £42,043

Granny annexe - £87,043

Garden office - £10,043

Convert a Garage - £16,043

Garage - £18,543

Build a flat roof extension - £22,043

Build a dormer loft conversion - £42,043

Concrete foundations - £6,293

Convert a bungalow loft - £29,043

Convert a basement - £37,986