Find a builder to make your building structurally sound

RSJs support your new extension or other construction to ensure that your property is structurally sound. They are crucial parts of your building work that mustn't be ignored, and must be installed by a professional. 

Install an RSJ cost in SY21 - Sort by rates or availability

OPH Joinery

From £2,288

(last active 22/09/26)

Relax... you have found a reliable extension builder in SY21. OPH Joinery is a friendly and reliable company based in SY21 who consider no job as t...

Richard Sherratt Builders Ltd

From £1,784

(last active 25/05/26)

Trusted and professional extension builder in SY21. Experienced in all extension buildering work and keeping within budget and on quote. Richard Sh...

John Sillitoe Building Contractor

From £1,560

John Sillitoe Building Contractor is a trusted extension builder serving customers in SY21 and the surrounding area. Contact us to today to get a c...

J S CONSTRUCTION

From £2,056

Trusted and professional extension builder in SY21. Experienced in all extension buildering work and keeping within budget and on quote. J S CONSTR...

EVABUILD LIMITED

From £1,712

Relax... you have found a reliable extension builder in SY21. EVABUILD LIMITED is a friendly and reliable company based in SY21 who consider no job...

SDW CONSTRUCTION LTD

From £1,720

Need to find an Extension Builder near you for all your extension buildering work?

SDW CONSTRUCTION LTD provides a local, trusted extension...

Kevin Davies Building Contractors

From £1,920

In the trade since left school(1990),accommodating and reliable, 

Your Home Made Ltd

From £2,040

Relax... you have found a reliable extension builder in SY21. Your Home Made Ltd is a friendly and reliable company based in SY21 who consider no j...

Fistral ltd

From £2,128

Need to find an Extension Builder near you for all your extension buildering work?

Fistral ltd provides a local, trusted extension builderi...

RSJ cost in SY21

Estimates for install an rsj near SY21

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.


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Install An RSJ near Shrewsbury£32£249
Install An RSJ near The Wrekin£30£236
Install An RSJ near Wrexham Maelor£34£261
Install An RSJ near Wrexham£34£263
Install An RSJ near Telford£30£241

Estimates for common extension builder jobs in SY21;

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.

More extensions & conversions cost guides...