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 ST4 - Sort by rates or availability

From £1,872

(last active 14/10/26)
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A & R Ansell Builders

A & R Ansell Builders is a trusted extension builder serving customers in ST4 and the surrounding area. Contact us to today to get a competitive qu...

From £1,952

(last active 14/10/26)
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B B ROOFCARE LTD

B B ROOFCARE LTD is a trusted extension builder serving customers in ST4 and the surrounding area. Contact us to today to get a competitive quote f...

From £1,880

(last active 14/10/26)
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A SHAFI CONSTRUCTION

A SHAFI CONSTRUCTION is an established and experienced local extension builder in ST4. Please contact us for a free, no obligation quote and compet...

From £2,184

(last active 14/10/26)
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ANDREWS CONSTRUCTION

Andrew Bell

Experienced extension builder ready to quote for your work. ANDREWS CONSTRUCTION is the best extension builder in ST4. No obligation free quotes an...

From £2,168

(last active 11/06/26)
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Fernz Construction

Trusted and professional extension builder in ST4. Experienced in all extension buildering work and keeping within budget and on quote. Fernz Const...

RSJ cost in ST4

Estimates for install an rsj near ST4

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in ST4 it ranges from £1,872 (A & R Ansell Builders based in ST4) to £2,184 (ANDREWS CONSTRUCTION based in ST3).

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 ST4 by posting a job with HaMuch and we will send it to extension builders in ST4.


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Estimates for common extension builder jobs in ST4;

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...