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 - £17,188

Two storey extension - £87,532

Build a timber frame extension - £25,688

Build a swimming pool - £80,688

Single storey extension - £48,760

Side return extension - £37,990

Install an RSJ - £1,888

Outbuilding - £9,688

Build a Mansard loft conversion - £51,688

Loft conversion - £30,825

Build a kitchen extension - £41,688

Hip to gable loft conversion - £41,688

Granny annexe - £86,688

Garden office - £9,688

Convert a Garage - £15,688

Garage - £18,188

Build a flat roof extension - £21,688

Build a dormer loft conversion - £41,688

Concrete foundations - £5,938

Convert a bungalow loft - £28,688

Convert a basement - £33,990

More extensions & conversions cost guides...