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 - £15,500

Two storey extension - £85,000

Build a timber frame extension - £24,000

Build a swimming pool - £79,000

Single storey extension - £15,000

Side return extension - £19,000

Install an RSJ - £200

Outbuilding - £8,000

Build a Mansard loft conversion - £50,000

Loft conversion - £15,000

Build a kitchen extension - £40,000

Hip to gable loft conversion - £40,000

Granny annexe - £85,000

Garden office - £8,000

Convert a Garage - £14,000

Garage - £16,500

Build a flat roof extension - £20,000

Build a dormer loft conversion - £40,000

Concrete foundations - £4,250

Convert a bungalow loft - £27,000

Convert a basement - £15,000

More extensions & conversions cost guides...