From £17,372
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £16,916
Octagon Construction Ltd is a trusted extension builder serving customers in LL18 and the surrounding area. Contact us to today to get a competitiv...
From £17,332
Wood floor services is a trusted extension builder serving customers in LL18 and the surrounding area. Contact us to today to get a competitive qu...
From £16,956
S ROBERTS ROOFING are here to help customers who need an Extension Builder in LL18. We offer a competitive rate to complete all your extension buil...
From £16,948
We are a company with over 30 years of experience. Who pride ourselves by providing a honest reliable service
From £17,076
, LL28
Relax... you have found a reliable extension builder in LL18. UK Leisure Living Ltd is a friendly and reliable company based in LL18 who consider n...
From £17,300
Need an Extension Builder in LL18? Chris's Roofing & Property Maintenance has been helping local clients (20 mile radius) with their extension buil...
From £17,396
Relax... you have found a reliable extension builder in LL18. L & J BUILDERS is a friendly and reliable company based in LL18 who consider no job a...
From £17,324
GF Construction, headed by Gary Flower, are a team of highly skilled and experienced builders operating out of Moreton, and serving the Wirral and ...
From £17,284
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

Underpinning ranges from £16,916 (Octagon Construction Ltd based in LL18) to £17,396 (L & J BUILDERS based in LL15), 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 LL18 by posting a job with HaMuch and we will send it to extension builders in LL18.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Underpin A Building near Rhyl | £28 | £209 |
| Underpin A Building near Prestatyn | £29 | £213 |
| Underpin A Building near Colwyn Bay | £28 | £211 |
| Underpin A Building near Llandudno | £28 | £211 |
| Underpin A Building near Conway | £28 | £211 |
| Underpin A Building near Conwy | £28 | £211 |
| Underpin A Building near Heswall | £30 | £213 |
| Underpin A Building near Flintshire | £32 | £224 |
| Underpin A Building near Wirral | £31 | £219 |
| Underpin A Building near Connah's Quay | £33 | £229 |
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 - £17,190

Two storey extension - £87,536

Build a timber frame extension - £25,690

Build a swimming pool - £80,690

Single storey extension - £48,808

Side return extension - £38,017

Install an RSJ - £1,890

Outbuilding - £9,690

Build a Mansard loft conversion - £51,690

Loft conversion - £30,848

Build a kitchen extension - £41,690

Hip to gable loft conversion - £41,690

Granny annexe - £86,690

Garden office - £9,690

Convert a Garage - £15,690

Garage - £18,190

Build a flat roof extension - £21,690

Build a dormer loft conversion - £41,690

Concrete foundations - £5,940

Convert a bungalow loft - £28,690

Convert a basement - £34,017