From £86,848
SS BUILDER are here to help customers who need an Extension Builder in SA12. We offer a competitive rate to complete all your extension buildering ...
From £86,832
Need an Extension Builder in SA12? K.D.L Property Maintenance has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £86,976
Trusted and professional extension builder in SA12. Experienced in all extension buildering work and keeping within budget and on quote. HALL & HAR...
From £86,760
Marin Hughes General Builders is a trusted extension builder serving customers in SA12 and the surrounding area. Contact us to today to get a compe...
From £86,952
Trusted and professional extension builder in SA12. Experienced in all extension buildering work and keeping within budget and on quote. Complete B...
From £86,936
A Room at the Top are here to help customers who need an Extension Builder in SA12. We offer a competitive rate to complete all your extension buil...
From £86,632
Karina Lane Construction Ltd are here to help customers who need an Extension Builder in SA12. We offer a competitive rate to complete all your ext...
From £87,000
R.H Damp Proofing are here to help customers who need an Extension Builder in SA12. We offer a competitive rate to complete all your extension buil...
From £86,896
Fit kitchens and more ltd is an established and experienced local extension builder in SA12. Please contact us for a free, no obligation quote and ...
From £86,712
Trusted and professional extension builder in SA12. Experienced in all extension buildering work and keeping within budget and on quote. Masterbuil...

Building a granny annexe ranges from £86,632 (Karina Lane Construction Ltd based in SA7) to £87,000 (R.H Damp Proofing based in SA1), 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 SA12 by posting a job with HaMuch. We will send it to extension builders in SA12 who will be happy to help you.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Granny Annexe near Port Talbot | £26 | £188 |
| Granny Annexe near Neath | £25 | £191 |
| Granny Annexe near Maesteg | £32 | £239 |
| Granny Annexe near Neath Port Talbot | £26 | £188 |
| Granny Annexe near Swansea | £25 | £197 |
| Granny Annexe near Pyle | £30 | £234 |
| Granny Annexe near Porthcawl | £29 | £228 |
| Granny Annexe near Bridgend | £27 | £170 |
| Granny Annexe near Gorseinon | £25 | £196 |
| Granny Annexe near Rhondda | £27 | £183 |
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 - £17,354

Two storey extension - £87,782

Build a timber frame extension - £25,854

Build a swimming pool - £80,854

Single storey extension - £52,088

Side return extension - £39,862

Install an RSJ - £2,054

Outbuilding - £9,854

Build a Mansard loft conversion - £51,854

Loft conversion - £32,385

Build a kitchen extension - £41,854

Hip to gable loft conversion - £41,854

Granny annexe - £86,854

Garden office - £9,854

Convert a Garage - £15,854

Garage - £18,354

Build a flat roof extension - £21,854

Build a dormer loft conversion - £41,854

Concrete foundations - £6,104

Convert a bungalow loft - £28,854

Convert a basement - £35,862