From £17,820
Dovetail Ltd is a trusted extension builder serving customers in BS1 and the surrounding area. Contact us to today to get a competitive quote for e...
From £17,364
Nest Design & Build is a trusted extension builder serving customers in BS1 and the surrounding area. Contact us to today to get a competitive quot...
From £17,316
Berkeley Place are here to help customers who need an Extension Builder in BS1. We offer a competitive rate to complete all your extension builderi...
From £17,756
Symmetry Design And Build is a trusted extension builder serving customers in BS1 and the surrounding area. Contact us to today to get a competitiv...
From £17,316
Hourglass Design & Build is an established extension buildering business in BS1. We come highly recommended and provide competitive quotes for your...
From £17,708
Need an Extension Builder in BS1? Oasys Property Solutions has been helping local clients (20 mile radius) with their extension buildering jobs for...
From £17,452
ESW Ltd are here to help customers who need an Extension Builder in BS1. We offer a competitive rate to complete all your extension buildering jobs...
From £17,436
Relax... you have found a reliable extension builder in BS1. Morrisons Building Services is a friendly and reliable company based in BS1 who consid...
From £17,380
Lawrence Services Ltd - Design Manage Build is a trusted extension builder serving customers in BS1 and the surrounding area. Contact us to today t...
From £17,844
Custom Created Interiors are here to help customers who need an Extension Builder in BS1. We offer a competitive rate to complete all your extensio...

Underpinning ranges from £17,316 (Berkeley Place based in BS8) to £17,844 (Custom Created Interiors based in BS3), 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 BS1 by posting a job with HaMuch and we will send it to extension builders in BS1.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Bristol | £29 | £222 |
| Underpin A Building near Clifton | £29 | £222 |
| Underpin A Building near Kingswood | £29 | £223 |
| Underpin A Building near Keynsham | £29 | £222 |
| Underpin A Building near Bradley Stoke | £29 | £221 |
| Underpin A Building near Portishead | £29 | £221 |
| Underpin A Building near South Gloucestershire | £29 | £223 |
| Underpin A Building near North Somerset | £29 | £216 |
| Underpin A Building near Yate | £28 | £223 |
| Underpin A Building near Bath | £28 | £221 |
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 - £17,539

Two storey extension - £88,059

Build a timber frame extension - £26,039

Build a swimming pool - £81,039

Single storey extension - £55,784

Side return extension - £41,941

Install an RSJ - £2,239

Outbuilding - £10,039

Build a Mansard loft conversion - £52,039

Loft conversion - £34,118

Build a kitchen extension - £42,039

Hip to gable loft conversion - £42,039

Granny annexe - £87,039

Garden office - £10,039

Convert a Garage - £16,039

Garage - £18,539

Build a flat roof extension - £22,039

Build a dormer loft conversion - £42,039

Concrete foundations - £6,289

Convert a bungalow loft - £29,039

Convert a basement - £37,941