From £1,248
Need to find an Extension Builder near you for all your extension buildering work?
P K BUILDING provides a local, trusted extension builder...
From £1,816
Experienced extension builder ready to quote for your work. JA Building Maintenance is the best extension builder in CF11. No obligation free quote...
From £1,928
Neil Causon & Son is an established and experienced local extension builder in CF11. Please contact us for a free, no obligation quote and competit...
From £2,936
An experienced quality tradesman who is a member of the federation of master builders.
Any projects will be undertaken safely, professio...
From £1,984
Experienced extension builder ready to quote for your work. TOR BUILD is the best extension builder in CF11. No obligation free quotes and many hap...
From £2,240
Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...
From £2,040
MOORLAND DESIGN & BUILD LTD are here to help customers who need an Extension Builder in CF11. We offer a competitive rate to complete all your exte...
From £1,992
T Porter Buiding is an established and experienced local extension builder in CF11. Please contact us for a free, no obligation quote and competiti...
From £1,832
Relax... you have found a reliable extension builder in CF11. Charles Marshall Contracting Ltd is a friendly and reliable company based in CF11 who...
From £1,400
Very reliable honest and hard working guarantee all work clean and tidy first class work

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CF11 it ranges from £1,248 (P K BUILDING based in TA8) to £2,936 (WMP Builders based in TA9).
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 CF11 by posting a job with HaMuch and we will send it to extension builders in CF11.
"RSJ installation to open up kitchen and utility room. About 2m wide." - CARDIFF, job posted 01/01/70
"RSJ installation" - CARDIFF, job posted 01/01/70
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Cardiff | £34 | £219 |
| Install An RSJ near Penarth | £35 | £218 |
| Install An RSJ near Barry | £33 | £218 |
| Install An RSJ near Caerphilly | £33 | £208 |
| Install An RSJ near Church Village | £34 | £214 |
| Install An RSJ near Risca | £32 | £218 |
| Install An RSJ near Pontypridd | £33 | £211 |
| Install An RSJ near Newport | £41 | £233 |
| Install An RSJ near Vale of Glamorgan | £29 | £217 |
| Install An RSJ near Weston-super-Mare | £33 | £253 |
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 - £17,242

Two storey extension - £87,612

Build a timber frame extension - £25,742

Build a swimming pool - £80,742

Single storey extension - £49,832

Side return extension - £38,593

Install an RSJ - £1,942

Outbuilding - £9,742

Build a Mansard loft conversion - £51,742

Loft conversion - £31,328

Build a kitchen extension - £41,742

Hip to gable loft conversion - £41,742

Granny annexe - £86,742

Garden office - £9,742

Convert a Garage - £15,742

Garage - £18,242

Build a flat roof extension - £21,742

Build a dormer loft conversion - £41,742

Concrete foundations - £5,992

Convert a bungalow loft - £28,742

Convert a basement - £34,593