From £86,608
Our building services company SP Coupland Ltd have thirty-eight years’ experience and have been helping customers in Sir Ceredigion and the surro...
From £86,616
Experienced extension builder ready to quote for your work. DRAGON CONSTRUCTION T/A is the best extension builder in SY23. No obligation free quote...

Building a granny annexe ranges from £86,608 (SP Coupland Ltd based in SY25) to £86,616 (DRAGON CONSTRUCTION T/A based in SY25), but these are just estimates that can help give you an idea of who will be better value in your area.
The best thing to do is to get quotes to build a granny annexe in SY23 by posting a job with HaMuch. We will send it to extension builders in SY23 who will be happy to help you.
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 - £17,112

Two storey extension - £87,418

Build a timber frame extension - £25,612

Build a swimming pool - £80,612

Single storey extension - £47,240

Side return extension - £37,135

Install an RSJ - £1,812

Outbuilding - £9,612

Build a Mansard loft conversion - £51,612

Loft conversion - £30,113

Build a kitchen extension - £41,612

Hip to gable loft conversion - £41,612

Granny annexe - £86,612

Garden office - £9,612

Convert a Garage - £15,612

Garage - £18,112

Build a flat roof extension - £21,612

Build a dormer loft conversion - £41,612

Concrete foundations - £5,862

Convert a bungalow loft - £28,612

Convert a basement - £33,135