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 - £17,340

Two storey extension - £87,760

Build a timber frame extension - £25,840

Build a swimming pool - £80,840

Single storey extension - £51,800

Side return extension - £39,700

Install an RSJ - £2,040

Outbuilding - £9,840

Build a Mansard loft conversion - £51,840

Loft conversion - £32,250

Build a kitchen extension - £41,840

Hip to gable loft conversion - £41,840

Granny annexe - £86,840

Garden office - £9,840

Convert a Garage - £15,840

Garage - £18,340

Build a flat roof extension - £21,840

Build a dormer loft conversion - £41,840

Concrete foundations - £6,090

Convert a bungalow loft - £28,840

Convert a basement - £35,700

More extensions & conversions cost guides...