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 £2,392

Last active Nov 26
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SJ Expert Building Services

SJ Expert Building Services are here to help customers who need an Extension Builder in Friern Barnet. We offer a competitive rate to complete all ...

From £1,728

Last active Oct 26
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Bellator Construction Ltd

Dimitar Vakavliev

We are reliable tradesmen delivering quality works with attention to detail 

From £2,576

Last active Oct 26
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WT Construction Service Ltd

Need the extension buildering job done quickly without breaking the bank? WT Construction Service Ltd offer fast, reliable, and affordable extensio...

From £2,144

Last active Oct 26
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New Finishes

New Finishes is a trusted extension builder serving customers in Friern Barnet and the surrounding area. Contact us to today to get a competitive q...

From £2,576

Last active Oct 26
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Pavillion Building Services

Relax... you have found a reliable extension builder in Friern Barnet. Pavillion Building Services is a friendly and reliable company based in Frie...

From £2,256

Last active Oct 26
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Wittick Building Ltd

Wittick Building Ltd is a trusted extension builder serving customers in Friern Barnet and the surrounding area. Contact us to today to get a compe...

From £2,408

Last active Sep 26
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Roni Lofts Conversions Ltd

Need an Extension Builder in Friern Barnet? Roni Lofts Conversions Ltd has been helping local clients (10 mile radius) with their extension builder...

From £2,328

Last active Aug 26
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GG CONSTRUCTION LTD

GG CONSTRUCTION LTD is a trusted extension builder serving customers in Friern Barnet and the surrounding area. Contact us to today to get a compet...

From £1,520

Last active Aug 26
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Onyx Iv

Ivaylo Shkodrov

Extremely reliable service . Flexibility, correct, listening customer.  Wide experience.  

From £2,296

Last active Aug 26
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Taylor Construction Services Ltd

Relax... you have found a reliable extension builder in Friern Barnet. Taylor Construction Services Ltd is a friendly and reliable company based in...

RSJ cost in Friern Barnet

Estimates for install an rsj near Friern Barnet

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Friern Barnet it ranges from £1,520 (Onyx Iv based in N11) to £2,576 (WT Construction Service Ltd based in N11).

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


Estimates for common extension builder jobs in Friern Barnet;

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...