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Select your affordable Carmarthenshire extension builder
Need to find an Extension Builder near you for all your extension buildering work?
Max Sandford & San provides a local, trusted extension b...
Need to find an Extension Builder near you for all your extension buildering work?
G.I Davies & Son provides a local, trusted extension bui...
D.A Fisher General Builders is an established and experienced local extension builder in Carmarthenshire. Please contact us for a free, no obligati...
From £86,736
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £86,936
Nigel Morgans
Need to find an Extension Builder near you for all your extension buildering work?
N Morgans & Son Ltd provides a local, trusted extension ...

Building a granny annexe ranges from £86,576 (G.I Davies & Son based in SA32) to £86,936 (N Morgans & Son Ltd based in SA33), 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 Carmarthenshire by posting a job with HaMuch. We will send it to extension builders in Carmarthenshire who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Carmarthenshire | £26 | £205 |
| Granny Annexe near Carmarthen | £26 | £205 |
| Granny Annexe near Llanelli | £29 | £231 |
| Granny Annexe near Gorseinon | £29 | £228 |
| Granny Annexe near Swansea | £29 | £229 |
| Granny Annexe near Neath | £30 | £225 |
| Granny Annexe near Neath Port Talbot | £31 | £224 |
| Granny Annexe near Pembrokeshire | £19 | £163 |
| Granny Annexe near Port Talbot | £31 | £227 |
| Granny Annexe near Milford Haven | £18 | £159 |
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 - £17,198

Two storey extension - £87,546

Build a timber frame extension - £25,698

Build a swimming pool - £80,698

Single storey extension - £48,952

Side return extension - £38,098

Install an RSJ - £1,898

Outbuilding - £9,698

Build a Mansard loft conversion - £51,698

Loft conversion - £30,915

Build a kitchen extension - £41,698

Hip to gable loft conversion - £41,698

Granny annexe - £86,698

Garden office - £9,698

Convert a Garage - £15,698

Garage - £18,198

Build a flat roof extension - £21,698

Build a dormer loft conversion - £41,698

Concrete foundations - £5,948

Convert a bungalow loft - £28,698

Convert a basement - £34,098