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 - £17,500

Two storey extension - £88,000

Build a timber frame extension - £26,000

Build a swimming pool - £81,000

Single storey extension - £55,000

Side return extension - £41,500

Install an RSJ - £2,200

Outbuilding - £10,000

Build a Mansard loft conversion - £52,000

Loft conversion - £33,750

Build a kitchen extension - £42,000

Hip to gable loft conversion - £42,000

Granny annexe - £87,000

Garden office - £10,000

Convert a Garage - £16,000

Garage - £18,500

Build a flat roof extension - £22,000

Build a dormer loft conversion - £42,000

Concrete foundations - £6,250

Convert a bungalow loft - £29,000

Convert a basement - £37,500

More extensions & conversions cost guides...