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...
From £1,752
P ALLEN BUILDERS is an established and experienced local extension builder in CF38. Please contact us for a free, no obligation quote and competiti...
From £1,880
General Building and Property Renovation Specialists A family business since Based in South Wales We specialise in all aspects of residential build...
From £1,920
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...
From £2,128
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
Excel Home Design Ltd is an established extension buildering business in CF38. We come highly recommended and provide competitive quotes for your w...
From £1,992
We are a small family run business, established over 35 years ago, specialising in Hard Landscaping (Patios) and Block Paving.We a...
From £1,928
Dream Homes is an established and experienced local extension builder in CF38. Please contact us for a free, no obligation quote and competitive ra...
From £2,168
We are a design, build and project management company offering you exceptional customer service and attention to detail in our workmanship. Whether...
From £2,088
yourHOME Construction are here to help customers who need an Extension Builder in CF38. We offer a competitive rate to complete all your extension ...

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 £2,168 (Dream Homes based in CF15).
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 | £35 | £219 |
| Install An RSJ near Risca | £32 | £218 |
| Install An RSJ near Penarth | £36 | £217 |
| Install An RSJ near Barry | £33 | £218 |
| 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 - £17,249

Two storey extension - £87,623

Build a timber frame extension - £25,749

Build a swimming pool - £80,749

Single storey extension - £49,976

Side return extension - £38,674

Install an RSJ - £1,949

Outbuilding - £9,749

Build a Mansard loft conversion - £51,749

Loft conversion - £31,395

Build a kitchen extension - £41,749

Hip to gable loft conversion - £41,749

Granny annexe - £86,749

Garden office - £9,749

Convert a Garage - £15,749

Garage - £18,249

Build a flat roof extension - £21,749

Build a dormer loft conversion - £41,749

Concrete foundations - £5,999

Convert a bungalow loft - £28,749

Convert a basement - £34,674