From £16,932
WJ Builders is an established and experienced local extension builder in Barmouth. Please contact us for a free, no obligation quote and competitiv...

Underpinning ranges from £16,932 (WJ Builders based in LL53) to £16,932 (WJ Builders based in LL53), 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 Barmouth by posting a job with HaMuch and we will send it to extension builders in Barmouth.
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 - £16,932

Two storey extension - £87,148

Build a timber frame extension - £25,432

Build a swimming pool - £80,432

Single storey extension - £43,640

Side return extension - £35,110

Install an RSJ - £1,632

Outbuilding - £9,432

Build a Mansard loft conversion - £51,432

Loft conversion - £28,425

Build a kitchen extension - £41,432

Hip to gable loft conversion - £41,432

Granny annexe - £86,432

Garden office - £9,432

Convert a Garage - £15,432

Garage - £17,932

Build a flat roof extension - £21,432

Build a dormer loft conversion - £41,432

Concrete foundations - £5,682

Convert a bungalow loft - £28,432

Convert a basement - £31,110