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 RM20 - Sort by rates or availability

From £2,296

(last active 09/10/26)
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FLEX CONSTRUCTION LIMITED

Joe

FLEX CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in RM20. We offer a competitive rate to complete all your extens...

From £2,592

(last active 09/10/26)
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The England Team

The England Team is an established extension buildering business in RM20. We come highly recommended and provide competitive quotes for your work.<...

From £2,472

(last active 03/08/26)
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L A CONSTRUCTION LIMITED

Location

Grays, RM20

L A CONSTRUCTION LIMITED are here to help customers who need an Extension Builder in RM20. We offer a competitive rate to complete all your extensi...

From £2,528

(last active 18/04/26)
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PALMERS BUILDERS LIMITED

Trusted and professional extension builder in RM20. Experienced in all extension buildering work and keeping within budget and on quote. PALMERS BU...

From £2,136

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Renewvate

Experienced extension builder ready to quote for your work. Renewvate is the best extension builder in RM20. No obligation free quotes and many hap...

From £2,464

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Vitec Interiors Ltd

Our building services company Vitec Interiors Ltd have over twenty-eight years’ experience in the trade. Since then we have been helping customer...

RSJ cost in RM20

Estimates for install an rsj near RM20

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in RM20 it ranges from £2,136 (Renewvate based in RM17) to £2,592 (The England Team based in RM16).

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 RM20 by posting a job with HaMuch and we will send it to extension builders in RM20.


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Estimates for common extension builder jobs in RM20;

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...