From £2,096
Barlam Drylining Ltd are here to help customers who need an Extension Builder in CF37. We offer a competitive rate to complete all your extension b...
From £2,072
Need an Extension Builder in CF37? P.D.Builders has been helping local clients (20 mile radius) with their extension buildering jobs for many years...
From £1,400
Very reliable honest and hard working guarantee all work clean and tidy first class work
From £1,816
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in CF37. No obligation free quote...
From £1,984
Experienced extension builder ready to quote for your work. TOR BUILD is the best extension builder in CF37. No obligation free quotes and many hap...
From £1,992
T Porter Buiding is an established and experienced local extension builder in CF37. Please contact us for a free, no obligation quote and competiti...
From £1,832
Relax... you have found a reliable extension builder in CF37. Charles Marshall Contracting Ltd is a friendly and reliable company based in CF37 who...
From £1,960
Sharif General Builder is an established and experienced local extension builder in CF37. Please contact us for a free, no obligation quote and com...
From £1,928
Experienced extension builder ready to quote for your work. Limitlesskitchens is the best extension builder in CF37. No obligation free quotes and ...
From £1,776
Relax... you have found a reliable extension builder in CF37. Cwtch Property Developments is a friendly and reliable company based in CF37 who cons...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CF37 it ranges from £1,400 (A.Gaddarn Builders based in NP11) 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 CF37 by posting a job with HaMuch and we will send it to extension builders in CF37.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Pontypridd | £33 | £211 |
| Install An RSJ near Church Village | £34 | £214 |
| Install An RSJ near Rhondda | £31 | £206 |
| Install An RSJ near Caerphilly | £33 | £208 |
| Install An RSJ near Rhondda, Cynon, Taff | £31 | £209 |
| Install An RSJ near Aberdare | £32 | £212 |
| Install An RSJ near Risca | £32 | £218 |
| Install An RSJ near Merthyr Tydfil | £33 | £220 |
| Install An RSJ near Cardiff | £34 | £219 |
| Install An RSJ near Tredegar | £30 | £217 |
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 - £17,186

Two storey extension - £87,528

Build a timber frame extension - £25,686

Build a swimming pool - £80,686

Single storey extension - £48,712

Side return extension - £37,963

Install an RSJ - £1,886

Outbuilding - £9,686

Build a Mansard loft conversion - £51,686

Loft conversion - £30,803

Build a kitchen extension - £41,686

Hip to gable loft conversion - £41,686

Granny annexe - £86,686

Garden office - £9,686

Convert a Garage - £15,686

Garage - £18,186

Build a flat roof extension - £21,686

Build a dormer loft conversion - £41,686

Concrete foundations - £5,936

Convert a bungalow loft - £28,686

Convert a basement - £33,963