A&L Building Services is an established and experienced local extension builder in BS20. Please contact us for a free, no obligation quote and comp...
Neil Causon & Son is an established and experienced local extension builder in BS20. Please contact us for a free, no obligation quote and competit...
'Imagination was created to deliver perfection. Our business philosophy is that you should never have to compromise on quality. Through our years o...
From £17,988
Stephen Hopkins
Relax... you have found a reliable extension builder in BS20. MERIT SW LTD is a friendly and reliable company based in BS20 who consider no job as ...
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 £17,660
We are a dedicated domestic property refurbishment company with an excellent reputation. We only do all our work to the highest standard. Contact u...
From £17,508
SORRY BUT WE ARE NOW FULLY BOOKED UP TILL SEPTEMBER 2023 We are a small, family-run firm offering fantastic workmanship at fair prices througho...
From £17,524
Pod Design & Build are here to help customers who need an Extension Builder in BS20. We offer a competitive rate to complete all your extension bui...

Underpinning ranges from £17,228 (Neil Causon & Son based in BS21) 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 BS20 by posting a job with HaMuch and we will send it to extension builders in BS20.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Portishead | £33 | £247 |
| Underpin A Building near Clevedon | £32 | £243 |
| Underpin A Building near Clifton | £33 | £255 |
| Underpin A Building near North Somerset | £32 | £245 |
| Underpin A Building near Bristol | £33 | £255 |
| Underpin A Building near Bradley Stoke | £34 | £259 |
| Underpin A Building near Kingswood | £34 | £257 |
| Underpin A Building near Weston-super-Mare | £33 | £253 |
| Underpin A Building near Keynsham | £33 | £251 |
| Underpin A Building near South Gloucestershire | £34 | £260 |
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 - £17,559

Two storey extension - £88,089

Build a timber frame extension - £26,059

Build a swimming pool - £81,059

Single storey extension - £56,180

Side return extension - £42,164

Install an RSJ - £2,259

Outbuilding - £10,059

Build a Mansard loft conversion - £52,059

Loft conversion - £34,303

Build a kitchen extension - £42,059

Hip to gable loft conversion - £42,059

Granny annexe - £87,059

Garden office - £10,059

Convert a Garage - £16,059

Garage - £18,559

Build a flat roof extension - £22,059

Build a dormer loft conversion - £42,059

Concrete foundations - £6,309

Convert a bungalow loft - £29,059

Convert a basement - £38,164