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 - £16,892

Two storey extension - £87,088

Build a timber frame extension - £25,392

Build a swimming pool - £80,392

Single storey extension - £42,840

Side return extension - £34,660

Install an RSJ - £1,592

Outbuilding - £9,392

Build a Mansard loft conversion - £51,392

Loft conversion - £28,050

Build a kitchen extension - £41,392

Hip to gable loft conversion - £41,392

Granny annexe - £86,392

Garden office - £9,392

Convert a Garage - £15,392

Garage - £17,892

Build a flat roof extension - £21,392

Build a dormer loft conversion - £41,392

Concrete foundations - £5,642

Convert a bungalow loft - £28,392

Convert a basement - £30,660

More extensions & conversions cost guides...