From £87,104
Need an Extension Builder in BA3? RHayes Roofing has been helping local clients (20 mile radius) with their extension buildering jobs for many year...
From £87,200
Trusted and professional extension builder in BA3. Experienced in all extension buildering work and keeping within budget and on quote. CETH CONSTR...
From £86,872
Need an Extension Builder in BA3? Marptree Design & Build limited has been helping local clients (20 mile radius) with their extension buildering j...
From £86,976
K STOBBS BUILDING CONTRACTOR is an established extension buildering business in BA3. We come highly recommended and provide competitive quotes for ...
From £87,072
BURNELL BUILDERS LTD is an established extension buildering business in BA3. We come highly recommended and provide competitive quotes for your wor...
From £86,816
Experienced extension builder ready to quote for your work. J CROZIER (BUILDERS) LTD is the best extension builder in BA3. No obligation free quote...
From £86,928
Need an Extension Builder in BA3? Wattsfield Construction has been helping local clients (20 mile radius) with their extension buildering jobs for ...
From £87,928
We are a family run small business, we only use fully time served tradespeople. Having been building for 22years a still having a passion for quali...
From £86,968
Our building services company Wellsway Building Company was established in 2017. Since then we have been helping customers in Bath and the surround...

Building a granny annexe ranges from £86,816 (J CROZIER (BUILDERS) LTD based in BA2) to £87,928 (Unique Design & Build based in BS39), 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 BA3 by posting a job with HaMuch. We will send it to extension builders in BA3 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Bath | £32 | £249 |
| Granny Annexe near Frome | £33 | £263 |
| Granny Annexe near Keynsham | £33 | £251 |
| Granny Annexe near Trowbridge | £34 | £266 |
| Granny Annexe near Kingswood | £34 | £257 |
| Granny Annexe near Bristol | £33 | £255 |
| Granny Annexe near Clifton | £33 | £255 |
| Granny Annexe near North Somerset | £32 | £245 |
| Granny Annexe near South Gloucestershire | £34 | £260 |
| 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 - £17,616

Two storey extension - £88,174

Build a timber frame extension - £26,116

Build a swimming pool - £81,116

Single storey extension - £57,320

Side return extension - £42,805

Install an RSJ - £2,316

Outbuilding - £10,116

Build a Mansard loft conversion - £52,116

Loft conversion - £34,838

Build a kitchen extension - £42,116

Hip to gable loft conversion - £42,116

Granny annexe - £87,116

Garden office - £10,116

Convert a Garage - £16,116

Garage - £18,616

Build a flat roof extension - £22,116

Build a dormer loft conversion - £42,116

Concrete foundations - £6,366

Convert a bungalow loft - £29,116

Convert a basement - £38,805