From £17,188
PORTCLIFF BUILDING SERV LTD is an established extension buildering business in BS21. We come highly recommended and provide competitive quotes for ...
From £17,228
Neil Causon & Son is an established and experienced local extension builder in BS21. Please contact us for a free, no obligation quote and competit...
From £17,116
A J READ ESQ is a trusted extension builder serving customers in BS21 and the surrounding area. Contact us to today to get a competitive quote for ...
From £17,284
MICHAEL PANG BUILDING SERVICES is an established and experienced local extension builder in BS21. 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 £17,644
'Imagination was created to deliver perfection. Our business philosophy is that you should never have to compromise on quality. Through our years o...
From £17,532
Need an Extension Builder in BS21? Creative Developments South West has been helping local clients (20 mile radius) with their extension buildering...
From £17,356
Creative Design and Build SW is a reputable company with over 30 years of experience in the construction industry. We are dedicating team providing...
From £17,988
Relax... you have found a reliable extension builder in BS21. MERIT SW LTD is a friendly and reliable company based in BS21 who consider no job as ...
From £17,340
MOORLAND DESIGN & BUILD LTD are here to help customers who need an Extension Builder in BS21. We offer a competitive rate to complete all your exte...

Underpinning ranges from £17,116 (A J READ ESQ based in BS20) to £17,988 (MERIT SW LTD based in Bs20), 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 BS21 by posting a job with HaMuch and we will send it to extension builders in BS21.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Clevedon | £29 | £219 |
| Underpin A Building near North Somerset | £29 | £216 |
| Underpin A Building near Portishead | £29 | £221 |
| Underpin A Building near Weston-super-Mare | £29 | £216 |
| Underpin A Building near Clifton | £29 | £222 |
| Underpin A Building near Bristol | £29 | £222 |
| Underpin A Building near Newport | £37 | £200 |
| Underpin A Building near Bradley Stoke | £29 | £221 |
| Underpin A Building near Cardiff | £30 | £190 |
| Underpin A Building near Penarth | £31 | £189 |
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 - £17,411

Two storey extension - £87,867

Build a timber frame extension - £25,911

Build a swimming pool - £80,911

Single storey extension - £53,224

Side return extension - £40,501

Install an RSJ - £2,111

Outbuilding - £9,911

Build a Mansard loft conversion - £51,911

Loft conversion - £32,918

Build a kitchen extension - £41,911

Hip to gable loft conversion - £41,911

Granny annexe - £86,911

Garden office - £9,911

Convert a Garage - £15,911

Garage - £18,411

Build a flat roof extension - £21,911

Build a dormer loft conversion - £41,911

Concrete foundations - £6,161

Convert a bungalow loft - £28,911

Convert a basement - £36,501