Alan Gaddarn
Very reliable honest and hard working guarantee all work clean and tidy first class work
P ALLEN BUILDERS is an established and experienced local extension builder in Caerphilly. Please contact us for a free, no obligation quote and com...
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in Caerphilly. No obligation free...
Experienced extension builder ready to quote for your work. TOR BUILD is the best extension builder in Caerphilly. No obligation free quotes and ma...
Relax... you have found a reliable extension builder in Caerphilly. Charles Marshall Contracting Ltd is a friendly and reliable company based in Ca...
Rhydian Rodrigues
Construction Jobs is an established and experienced local extension builder in Caerphilly. Please contact us for a free, no obligation quote and co...
Gareth Thorpe
G T Brickwork is an established extension buildering business in Caerphilly. We come highly recommended and provide competitive quotes for your wor...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
MARWAY BUILDING LTD is a trusted extension builder serving customers in Caerphilly and the surrounding area. Contact us to today to get a competiti...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Caerphilly it ranges from £1,400 (A.Gaddarn Builders based in NP11) to £2,016 (G T Brickwork based in CF82).
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 Caerphilly by posting a job with HaMuch and we will send it to extension builders in Caerphilly.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Caerphilly | £33 | £208 |
| Install An RSJ near Church Village | £34 | £214 |
| Install An RSJ near Pontypridd | £33 | £211 |
| Install An RSJ near Risca | £32 | £218 |
| Install An RSJ near Cardiff | £34 | £219 |
| Install An RSJ near Rhondda | £31 | £206 |
| Install An RSJ near Newport | £41 | £233 |
| Install An RSJ near Cwmbran | £43 | £219 |
| Install An RSJ near Penarth | £35 | £219 |
| Install An RSJ near Rhondda, Cynon, Taff | £31 | £209 |
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 - £17,131

Two storey extension - £87,447

Build a timber frame extension - £25,631

Build a swimming pool - £80,631

Single storey extension - £47,624

Side return extension - £37,351

Install an RSJ - £1,831

Outbuilding - £9,631

Build a Mansard loft conversion - £51,631

Loft conversion - £30,293

Build a kitchen extension - £41,631

Hip to gable loft conversion - £41,631

Granny annexe - £86,631

Garden office - £9,631

Convert a Garage - £15,631

Garage - £18,131

Build a flat roof extension - £21,631

Build a dormer loft conversion - £41,631

Concrete foundations - £5,881

Convert a bungalow loft - £28,631

Convert a basement - £33,351