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 £1,928
Dream Homes is an established and experienced local extension builder in CF15. 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 CF15. We offer a competitive rate to complete all your extension ...
From £1,920
Vencer understand that when it comes to delivering client\nsatisfaction, the project or property involved will require\nbeing delivered on time, wi...
From £1,928
The Philog Paving Services is an established extension buildering business in CF15. We come highly recommended and provide competitive quotes for y...
From £1,800
MARWAY BUILDING LTD is a trusted extension builder serving customers in CF15 and the surrounding area. Contact us to today to get a competitive quo...
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 £1,960
Construction Jobs is an established and experienced local extension builder in CF15. Please contact us for a free, no obligation quote and competit...
From £2,008
Experienced extension builder ready to quote for your work. Chapman Builders is the best extension builder in CF15. No obligation free quotes and m...

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CF15 it ranges from £1,800 (MARWAY BUILDING LTD based in CF5) 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 CF15 by posting a job with HaMuch and we will send it to extension builders in CF15.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Church Village | £34 | £214 |
| Install An RSJ near Caerphilly | £33 | £208 |
| Install An RSJ near Pontypridd | £33 | £211 |
| Install An RSJ near Cardiff | £34 | £219 |
| Install An RSJ near Penarth | £35 | £218 |
| Install An RSJ near Rhondda | £31 | £206 |
| Install An RSJ near Barry | £33 | £218 |
| Install An RSJ near Risca | £32 | £218 |
| Install An RSJ near Rhondda, Cynon, Taff | £31 | £209 |
| Install An RSJ near Newport | £41 | £233 |
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 - £17,281

Two storey extension - £87,671

Build a timber frame extension - £25,781

Build a swimming pool - £80,781

Single storey extension - £50,616

Side return extension - £39,034

Install an RSJ - £1,981

Outbuilding - £9,781

Build a Mansard loft conversion - £51,781

Loft conversion - £31,695

Build a kitchen extension - £41,781

Hip to gable loft conversion - £41,781

Granny annexe - £86,781

Garden office - £9,781

Convert a Garage - £15,781

Garage - £18,281

Build a flat roof extension - £21,781

Build a dormer loft conversion - £41,781

Concrete foundations - £6,031

Convert a bungalow loft - £28,781

Convert a basement - £35,034