From £31,110
WJ Builders is an established and experienced local extension builder in Barmouth. Please contact us for a free, no obligation quote and competitiv...

Comparing extension builders estimates for a Convert a basement gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes for the cost to convert a basement 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