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 green button.

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From £2,168

Last active Nov 26
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Andy's Building Services

Trusted and professional extension builder in Southampton. Experienced in all extension buildering work and keeping within budget and on quote. And...

From £2,392

Last active Oct 26
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AAConcepts

Arshad Ali

We are a Design and Build company based in Hampshire. Proud of our roots, we try to be the very best in the way we go about our business. Friendly...

From £2,160

Last active Oct 26
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ROB DINE CONSTRUCTION

ROB DINE CONSTRUCTION is an established and experienced local extension builder in Southampton. Please contact us for a free, no obligation quote a...

From £2,320

Last active Oct 26
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Mobile Services

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

Mobile Services provides a local, trusted extension buil...

From £2,336

Last active Oct 26
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Claytons Building and Roofing

Location

Southampton, SO19

Claytons Building and Roofing are here to help customers who need an Extension Builder in Southampton. We offer a competitive rate to complete all ...

From £1,952

Last active Oct 26
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Steve Lovett Builders

Reliable and experienced extension builders with competitive rates and good at keeping within budget. Happy to provide examples of extension builde...

From £2,072

Last active Oct 26
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General Building Services (Southampton) Ltd

Luke Rees

General Building Services (Southampton) Ltd is a trusted extension builder serving customers in Southampton and the surrounding area. Contact us to...

From £2,376

Last active Oct 26
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CSY Construction Ltd

Experienced extension builder ready to quote for your work. CSY Construction Ltd is the best extension builder in Southampton. No obligation free q...

From £2,392

Last active Sep 26
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A W PAVING LTD

Anthony Withey

Location

Southampton, SO31

Trusted and professional extension builder in Southampton. Experienced in all extension buildering work and keeping within budget and on quote. A W...

From £2,240

Last active Jul 26
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Grant Construction

Experienced extension builder ready to quote for your work. Grant Construction is the best extension builder in Southampton. No obligation free quo...

RSJ cost in Southampton

Estimates for install an rsj near Southampton

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Southampton it ranges from £1,952 (Steve Lovett Builders based in SO18) to £2,392 (AAConcepts based in SO14).

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


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Estimates for common extension builder jobs in Southampton;

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...