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 - £17,020

Two storey extension - £87,280

Build a timber frame extension - £25,520

Build a swimming pool - £80,520

Single storey extension - £45,400

Side return extension - £36,100

Install an RSJ - £1,720

Outbuilding - £9,520

Build a Mansard loft conversion - £51,520

Loft conversion - £29,250

Build a kitchen extension - £41,520

Hip to gable loft conversion - £41,520

Granny annexe - £86,520

Garden office - £9,520

Convert a Garage - £15,520

Garage - £18,020

Build a flat roof extension - £21,520

Build a dormer loft conversion - £41,520

Concrete foundations - £5,770

Convert a bungalow loft - £28,520

Convert a basement - £32,100

More extensions & conversions cost guides...