Barlam Drylining Ltd are here to help customers who need an Extension Builder in Rhondda. We offer a competitive rate to complete all your extensio...
P ALLEN BUILDERS is an established and experienced local extension builder in Rhondda. Please contact us for a free, no obligation quote and compet...
We are a small family run business, established over 35 years ago, specialising in Hard Landscaping (Patios) and Block Paving.We a...
Relax... you have found a reliable extension builder in Rhondda. WESTGATE BUILDING SERVICES LTD is a friendly and reliable company based in Rhondda...
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
S J S Services (Wales) Ltd is a trusted extension builder serving customers in Rhondda and the surrounding area. Contact us to today to get a compe...
Need an Extension Builder in Rhondda? SP Property Maintenance has been helping local clients (20 mile radius) with their extension buildering jobs ...
From £1,696
Trusted and professional extension builder in Rhondda. Experienced in all extension buildering work and keeping within budget and on quote. RJ CONS...
From £1,728
Need an Extension Builder in Rhondda? A POWELL CONSTRUCTION LTD has been helping local clients (20 mile radius) with their extension buildering job...
From £1,816
Excel Home Design Ltd is an established extension buildering business in Rhondda. We come highly recommended and provide competitive quotes for you...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Rhondda 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 Rhondda by posting a job with HaMuch and we will send it to extension builders in Rhondda.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Rhondda | £31 | £206 |
| Install An RSJ near Rhondda, Cynon, Taff | £31 | £209 |
| Install An RSJ near Pontypridd | £33 | £211 |
| Install An RSJ near Church Village | £34 | £214 |
| Install An RSJ near Aberdare | £32 | £212 |
| Install An RSJ near Caerphilly | £33 | £208 |
| Install An RSJ near Merthyr Tydfil | £33 | £220 |
| Install An RSJ near Maesteg | £38 | £283 |
| Install An RSJ near Bridgend | £32 | £200 |
| 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 - £17,195

Two storey extension - £87,543

Build a timber frame extension - £25,695

Build a swimming pool - £80,695

Single storey extension - £48,904

Side return extension - £38,071

Install an RSJ - £1,895

Outbuilding - £9,695

Build a Mansard loft conversion - £51,695

Loft conversion - £30,893

Build a kitchen extension - £41,695

Hip to gable loft conversion - £41,695

Granny annexe - £86,695

Garden office - £9,695

Convert a Garage - £15,695

Garage - £18,195

Build a flat roof extension - £21,695

Build a dormer loft conversion - £41,695

Concrete foundations - £5,945

Convert a bungalow loft - £28,695

Convert a basement - £34,071