
Building a granny annexe ranges from £0 ( based in 0) to £0 ( based in 0), 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 GL13 by posting a job with HaMuch. We will send it to extension builders in GL13 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Yate | £34 | £263 |
| Granny Annexe near Stroud | £33 | £249 |
| Granny Annexe near Bradley Stoke | £34 | £259 |
| Granny Annexe near South Gloucestershire | £34 | £260 |
| Granny Annexe near Quedgeley | £32 | £247 |
| Granny Annexe near Gloucester | £31 | £236 |
| Granny Annexe near Kingswood | £34 | £257 |
| Granny Annexe near Bristol | £33 | £255 |
| Granny Annexe near Clifton | £33 | £255 |
| Granny Annexe near Chippenham | £34 | £258 |
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 - £15,500

Two storey extension - £85,000

Build a timber frame extension - £24,000

Build a swimming pool - £79,000

Single storey extension - £15,000

Side return extension - £19,000

Install an RSJ - £200

Outbuilding - £8,000

Build a Mansard loft conversion - £50,000

Loft conversion - £15,000

Build a kitchen extension - £40,000

Hip to gable loft conversion - £40,000

Granny annexe - £85,000

Garden office - £8,000

Convert a Garage - £14,000

Garage - £16,500

Build a flat roof extension - £20,000

Build a dormer loft conversion - £40,000

Concrete foundations - £4,250

Convert a bungalow loft - £27,000

Convert a basement - £15,000