From £1,720
A service with a difference. Priced competitively to install an rsj and more.
From £1,560
If you need to install an rsj use John Sillitoe Building Contractor. Work is guarenteed and the cost won't hurt the pocket.
From £1,712
You want to install an rsj? No problem, EVABUILD LIMITED is a reliable extension builder with years of experience helping homeowners.
From £1,920
In the trade since left school(1990),accommodating and reliable,
From £2,040
You want to install an rsj? No problem, Your Home Made Ltd is a reliable extension builder with years of experience helping homeowners.
From £2,288
You want to install an rsj? No problem, OPH Joinery is a reliable extension builder with years of experience helping homeowners.
From £2,128
A service with a difference. Priced competitively to install an rsj and more.

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SY21 it ranges from £1,560 (John Sillitoe Building Contractor based in SY16) to £2,288 (OPH Joinery based in SY1).
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 SY21 by posting a job with HaMuch and we will send it to extension builders in SY21.
| Location in UK | Hourly Rate | Daily Rate |
|---|---|---|
| Install An RSJ near Shrewsbury | £24 | £192 |
| Install An RSJ near The Wrekin | £24 | £196 |
| Install An RSJ near Wrexham Maelor | £28 | £217 |
| Install An RSJ near Wrexham | £29 | £220 |
| Install An RSJ near Telford | £25 | £197 |
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 - £17,212

Two storey extension - £87,568

Build a timber frame extension - £25,712

Build a swimming pool - £80,712

Single storey extension - £49,240

Side return extension - £38,260

Install an RSJ - £1,912

Outbuilding - £9,712

Build a Mansard loft conversion - £51,712

Loft conversion - £31,050

Build a kitchen extension - £41,712

Hip to gable loft conversion - £41,712

Granny annexe - £86,712

Garden office - £9,712

Convert a Garage - £15,712

Garage - £18,212

Build a flat roof extension - £21,712

Build a dormer loft conversion - £41,712

Concrete foundations - £5,962

Convert a bungalow loft - £28,712

Convert a basement - £34,260