From £17,436
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,316
BRYAN LEE BUILDING CONST LTD is an established and experienced local extension builder in Darwen. Please contact us for a free, no obligation quote...
From £17,236
Need to find an Extension Builder near you for all your extension buildering work?
East Lancs Construction Ltd provides a local, trusted ex...
From £16,732
over 40 years experience in the trade my business has been established 45 years.
i am in the guild of master craftsmen and the lo...
From £17,284
Need to find an Extension Builder near you for all your extension buildering work?
D Parker Design & Build provides a local, trusted extens...
From £17,308
Need to find an Extension Builder near you for all your extension buildering work?
J. Grimshaw provides a local, trusted extension builderi...
From £17,124
WM Brickwork & Pointing are here to help customers who need an Extension Builder in Darwen. We offer a competitive rate to complete all your extens...
From £17,220
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,428
M. Pickering Builder & Joiner is a trusted extension builder serving customers in Darwen and the surrounding area. Contact us to today to get a com...
From £17,212
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,732 (COMPLETE BUILDING SERVICES based in BB2) to £17,436 (Garry Ryan Property Repairs based in BB1), 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 Darwen by posting a job with HaMuch and we will send it to extension builders in Darwen.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Darwen | £34 | £253 |
| Underpin A Building near Blackburn | £34 | £247 |
| Underpin A Building near Accrington | £33 | £245 |
| Underpin A Building near Chorley | £31 | £222 |
| Underpin A Building near Rawtenstall | £31 | £230 |
| Underpin A Building near Horwich | £30 | £219 |
| Underpin A Building near Bamber Bridge | £30 | £217 |
| Underpin A Building near Bolton | £31 | £219 |
| Underpin A Building near Leyland | £31 | £223 |
| Underpin A Building near Bury | £30 | £220 |
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 - £17,230

Two storey extension - £87,594

Build a timber frame extension - £25,730

Build a swimming pool - £80,730

Single storey extension - £49,592

Side return extension - £38,458

Install an RSJ - £1,930

Outbuilding - £9,730

Build a Mansard loft conversion - £51,730

Loft conversion - £31,215

Build a kitchen extension - £41,730

Hip to gable loft conversion - £41,730

Granny annexe - £86,730

Garden office - £9,730

Convert a Garage - £15,730

Garage - £18,230

Build a flat roof extension - £21,730

Build a dormer loft conversion - £41,730

Concrete foundations - £5,980

Convert a bungalow loft - £28,730

Convert a basement - £34,458