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P ALLEN BUILDERS is an established and experienced local extension builder in CF39. Please contact us for a free, no obligation quote and competiti...
We are a small family run business, established over 35 years ago, specialising in Hard Landscaping (Patios) and Block Paving.We a...
From £1,816
Excel Home Design Ltd is an established extension buildering business in CF39. We come highly recommended and provide competitive quotes for your w...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CF39 it ranges from £1,752 (P ALLEN BUILDERS based in CF37) to £1,992 (J.S. Builders based in CF39).
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 CF39 by posting a job with HaMuch and we will send it to extension builders in CF39.
| 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 Bridgend | £32 | £200 |
| Install An RSJ near Maesteg | £38 | £283 |
| Install An RSJ near Merthyr Tydfil | £33 | £220 |
| Install An RSJ near Pyle | £34 | £262 |
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 - £17,153

Two storey extension - £87,480

Build a timber frame extension - £25,653

Build a swimming pool - £80,653

Single storey extension - £48,067

Side return extension - £37,600

Install an RSJ - £1,853

Outbuilding - £9,653

Build a Mansard loft conversion - £51,653

Loft conversion - £30,500

Build a kitchen extension - £41,653

Hip to gable loft conversion - £41,653

Granny annexe - £86,653

Garden office - £9,653

Convert a Garage - £15,653

Garage - £18,153

Build a flat roof extension - £21,653

Build a dormer loft conversion - £41,653

Concrete foundations - £5,903

Convert a bungalow loft - £28,653

Convert a basement - £33,600