Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Trusted and professional extension builder in S66. Experienced in all extension buildering work and keeping within budget and on quote. Britishbuil...

Building a granny annexe ranges from £86,840 (Britishbuildogs based in S65) to £87,104 (G.J.H Joinery & Construction based in S65), 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 S66 by posting a job with HaMuch. We will send it to extension builders in S66 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Wickersley | £32 | £258 |
| Granny Annexe near Rotherham | £32 | £257 |
| Granny Annexe near Doncaster | £29 | £238 |
| Granny Annexe near Worksop | £33 | £265 |
| Granny Annexe near Sheffield | £32 | £261 |
| Granny Annexe near Dronfield | £33 | £262 |
| Granny Annexe near Bassetlaw | £31 | £243 |
| Granny Annexe near Barnsley | £31 | £242 |
| Granny Annexe near Retford | £31 | £243 |
| Granny Annexe near Chesterfield | £33 | £257 |
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 - £17,472

Two storey extension - £87,958

Build a timber frame extension - £25,972

Build a swimming pool - £80,972

Single storey extension - £54,440

Side return extension - £41,185

Install an RSJ - £2,172

Outbuilding - £9,972

Build a Mansard loft conversion - £51,972

Loft conversion - £33,488

Build a kitchen extension - £41,972

Hip to gable loft conversion - £41,972

Granny annexe - £86,972

Garden office - £9,972

Convert a Garage - £15,972

Garage - £18,472

Build a flat roof extension - £21,972

Build a dormer loft conversion - £41,972

Concrete foundations - £6,222

Convert a bungalow loft - £28,972

Convert a basement - £37,185