Experienced extension builder ready to quote for your work. SMH Joinery & Building is the best extension builder in BB4. No obligation free quotes ...
From £17,388
Broadley Construction is an established extension buildering business in BB4. We come highly recommended and provide competitive quotes for your wo...
From £17,068
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £17,068 (Passive Building Structures based in BL0) to £17,388 (Broadley Construction based in BB4), 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 BB4 by posting a job with HaMuch and we will send it to extension builders in BB4.
"Underpinning" - ACCRINGTON, job posted 04/06/25
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Rawtenstall | £29 | £213 |
| Underpin A Building near Accrington | £33 | £244 |
| Underpin A Building near Burnley | £29 | £219 |
| Underpin A Building near Darwen | £34 | £255 |
| Underpin A Building near Bury | £30 | £219 |
| Underpin A Building near Heywood | £30 | £221 |
| Underpin A Building near Rochdale | £30 | £221 |
| Underpin A Building near Blackburn | £33 | £247 |
| Underpin A Building near Nelson | £27 | £214 |
| Underpin A Building near Radcliffe | £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 - £17,271

Two storey extension - £87,656

Build a timber frame extension - £25,771

Build a swimming pool - £80,771

Single storey extension - £50,413

Side return extension - £38,920

Install an RSJ - £1,971

Outbuilding - £9,771

Build a Mansard loft conversion - £51,771

Loft conversion - £31,600

Build a kitchen extension - £41,771

Hip to gable loft conversion - £41,771

Granny annexe - £86,771

Garden office - £9,771

Convert a Garage - £15,771

Garage - £18,271

Build a flat roof extension - £21,771

Build a dormer loft conversion - £41,771

Concrete foundations - £6,021

Convert a bungalow loft - £28,771

Convert a basement - £34,920