Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Robert Wilson
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 £16,916
John Foster
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 £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...

Underpinning ranges from £16,916 (Octagon Construction Ltd based in LL18) to £17,372 (Brothers Construction based in LL18), 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 | £33 | £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 - £17,144

Two storey extension - £87,466

Build a timber frame extension - £25,644

Build a swimming pool - £80,644

Single storey extension - £47,880

Side return extension - £37,495

Install an RSJ - £1,844

Outbuilding - £9,644

Build a Mansard loft conversion - £51,644

Loft conversion - £30,413

Build a kitchen extension - £41,644

Hip to gable loft conversion - £41,644

Granny annexe - £86,644

Garden office - £9,644

Convert a Garage - £15,644

Garage - £18,144

Build a flat roof extension - £21,644

Build a dormer loft conversion - £41,644

Concrete foundations - £5,894

Convert a bungalow loft - £28,644

Convert a basement - £33,495