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 - £16,956

Two storey extension - £87,184

Build a timber frame extension - £25,456

Build a swimming pool - £80,456

Single storey extension - £44,120

Side return extension - £35,380

Install an RSJ - £1,656

Outbuilding - £9,456

Build a Mansard loft conversion - £51,456

Loft conversion - £28,650

Build a kitchen extension - £41,456

Hip to gable loft conversion - £41,456

Granny annexe - £86,456

Garden office - £9,456

Convert a Garage - £15,456

Garage - £17,956

Build a flat roof extension - £21,456

Build a dormer loft conversion - £41,456

Concrete foundations - £5,706

Convert a bungalow loft - £28,456

Convert a basement - £31,380

More extensions & conversions cost guides...