From £1,904
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,024
Need an Extension Builder in CF45? FORMWORK CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £2,096
Barlam Drylining Ltd are here to help customers who need an Extension Builder in CF45. We offer a competitive rate to complete all your extension b...
From £2,048
Relax... you have found a reliable extension builder in CF45. Professional Concrete Solutions is a friendly and reliable company based in CF45 who ...
From £1,728
Need an Extension Builder in CF45? A POWELL CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering jobs f...
From £1,776
L E JONES BUILDER is an established extension buildering business in CF45. We come highly recommended and provide competitive quotes for your work....
From £1,696
Trusted and professional extension builder in CF45. Experienced in all extension buildering work and keeping within budget and on quote. RJ CONSTRU...
From £2,008
Dare Fitness is an established extension buildering business in CF45. We come highly recommended and provide competitive quotes for your work.
...From £2,000
Need an Extension Builder in CF45? MG3Design has been helping local clients (20 mile radius) with their extension buildering jobs for many years. G...
From £1,752
P ALLEN BUILDERS is an established and experienced local extension builder in CF45. Please contact us for a free, no obligation quote and competiti...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CF45 it ranges from £1,696 (RJ CONSTRUCTION based in CF40) to £2,096 (Barlam Drylining Ltd based in CF45).
Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
Get rates and quotes to install an RSJ in CF45 by posting a job with HaMuch and we will send it to extension builders in CF45.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Rhondda, Cynon, Taff | £27 | £183 |
| Install An RSJ near Rhondda | £27 | £183 |
| Install An RSJ near Pontypridd | £29 | £184 |
| Install An RSJ near Aberdare | £28 | £186 |
| Install An RSJ near Merthyr Tydfil | £28 | £187 |
| Install An RSJ near Church Village | £30 | £188 |
| Install An RSJ near Tredegar | £24 | £195 |
| Install An RSJ near Caerphilly | £29 | £181 |
| Install An RSJ near Ebbw Vale | £24 | £195 |
| Install An RSJ near Risca | £27 | £185 |
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 - £17,203

Two storey extension - £87,555

Build a timber frame extension - £25,703

Build a swimming pool - £80,703

Single storey extension - £49,064

Side return extension - £38,161

Install an RSJ - £1,903

Outbuilding - £9,703

Build a Mansard loft conversion - £51,703

Loft conversion - £30,968

Build a kitchen extension - £41,703

Hip to gable loft conversion - £41,703

Granny annexe - £86,703

Garden office - £9,703

Convert a Garage - £15,703

Garage - £18,203

Build a flat roof extension - £21,703

Build a dormer loft conversion - £41,703

Concrete foundations - £5,953

Convert a bungalow loft - £28,703

Convert a basement - £34,161