P ALLEN BUILDERS is an established and experienced local extension builder in CF38. Please contact us for a free, no obligation quote and competiti...
Relax... you have found a reliable extension builder in CF38. WESTGATE BUILDING SERVICES LTD is a friendly and reliable company based in CF38 who c...
General Building and Property Renovation Specialists A family business since Based in South Wales We specialise in all aspects of residential build...
Paul Goode
Need to find an Extension Builder near you for all your extension buildering work?
GOODE BUILDING SERVICES provides a local, trusted extens...
From £1,816
EXTEND & BUILD LTD is an established and experienced local extension builder in CF38. Please contact us for a free, no obligation quote and competi...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CF38 it ranges from £1,752 (P ALLEN BUILDERS based in CF37) to £2,128 (GOODE BUILDING SERVICES based in CF83).
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 CF38 by posting a job with HaMuch and we will send it to extension builders in CF38.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Church Village | £34 | £214 |
| Install An RSJ near Pontypridd | £33 | £211 |
| Install An RSJ near Caerphilly | £33 | £208 |
| Install An RSJ near Rhondda | £31 | £206 |
| Install An RSJ near Rhondda, Cynon, Taff | £31 | £209 |
| Install An RSJ near Cardiff | £34 | £223 |
| Install An RSJ near Risca | £32 | £218 |
| Install An RSJ near Penarth | £35 | £224 |
| Install An RSJ near Barry | £33 | £223 |
| Install An RSJ near Bridgend | £32 | £200 |
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 - £17,199

Two storey extension - £87,549

Build a timber frame extension - £25,699

Build a swimming pool - £80,699

Single storey extension - £48,984

Side return extension - £38,116

Install an RSJ - £1,899

Outbuilding - £9,699

Build a Mansard loft conversion - £51,699

Loft conversion - £30,930

Build a kitchen extension - £41,699

Hip to gable loft conversion - £41,699

Granny annexe - £86,699

Garden office - £9,699

Convert a Garage - £15,699

Garage - £18,199

Build a flat roof extension - £21,699

Build a dormer loft conversion - £41,699

Concrete foundations - £5,949

Convert a bungalow loft - £28,699

Convert a basement - £34,116