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.  To see prices and availability for your job click Get quotes.

HaMuch is Excellent

Install an RSJ cost in SA31 - Sort by rates or availability

From £1,816

(last active 14/09/26)
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Max Sandford & San

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

Max Sandford & San provides a local, trusted extension b...

From £1,776

(last active 14/09/26)
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G.I Davies & Son

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

G.I Davies & Son provides a local, trusted extension bui...

RSJ cost in SA31

Estimates for install an rsj near SA31

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SA31 it ranges from £1,776 (G.I Davies & Son based in SA32) to £1,816 (Max Sandford & San based in SA31).

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 SA31 by posting a job with HaMuch and we will send it to extension builders in SA31.


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Estimates for common extension builder jobs in SA31;

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...