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 - £17,152

Two storey extension - £87,478

Build a timber frame extension - £25,652

Build a swimming pool - £80,652

Single storey extension - £48,040

Side return extension - £37,585

Install an RSJ - £1,852

Outbuilding - £9,652

Build a Mansard loft conversion - £51,652

Loft conversion - £30,488

Build a kitchen extension - £41,652

Hip to gable loft conversion - £41,652

Granny annexe - £86,652

Garden office - £9,652

Convert a Garage - £15,652

Garage - £18,152

Build a flat roof extension - £21,652

Build a dormer loft conversion - £41,652

Concrete foundations - £5,902

Convert a bungalow loft - £28,652

Convert a basement - £33,585

More extensions & conversions cost guides...