From £17,660
Experienced extension builder ready to quote for your work. LEES BUILDING CONTRACTORS LTD is the best extension builder in BS22. No obligation free...
From £17,364
Obsession design and build is a full building services company with an in house team combining extensive experienceand exquisite aspirations. Our t...
From £17,860
We are a medium sized Buisness with a huge reputation for quality workmanship
From £17,540
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,188
PORTCLIFF BUILDING SERV LTD is an established extension buildering business in BS22. We come highly recommended and provide competitive quotes for ...
From £16,548
Need to find an Extension Builder near you for all your extension buildering work?
P K BUILDING provides a local, trusted extension builder...
From £17,284
MICHAEL PANG BUILDING SERVICES is an established and experienced local extension builder in BS22. Please contact us for a free, no obligation quote...
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 £17,500
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £17,716
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,548 (P K BUILDING based in TA8) to £17,860 (A K BISHOP based in BS24), 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 BS22 by posting a job with HaMuch and we will send it to extension builders in BS22.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Weston-super-Mare | £33 | £253 |
| Underpin A Building near Clevedon | £32 | £243 |
| Underpin A Building near North Somerset | £32 | £245 |
| Underpin A Building near Portishead | £33 | £247 |
| Underpin A Building near Penarth | £36 | £217 |
| Underpin A Building near Cardiff | £35 | £219 |
| Underpin A Building near Clifton | £33 | £255 |
| Underpin A Building near Newport | £41 | £233 |
| Underpin A Building near Bristol | £33 | £255 |
| Underpin A Building near Bridgwater | £30 | £236 |
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 - £17,410

Two storey extension - £87,864

Build a timber frame extension - £25,910

Build a swimming pool - £80,910

Single storey extension - £53,192

Side return extension - £40,483

Install an RSJ - £2,110

Outbuilding - £9,910

Build a Mansard loft conversion - £51,910

Loft conversion - £32,903

Build a kitchen extension - £41,910

Hip to gable loft conversion - £41,910

Granny annexe - £86,910

Garden office - £9,910

Convert a Garage - £15,910

Garage - £18,410

Build a flat roof extension - £21,910

Build a dormer loft conversion - £41,910

Concrete foundations - £6,160

Convert a bungalow loft - £28,910

Convert a basement - £36,483