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 £2,352

Last active Nov 26
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J&S WALLINGTON LIMITED

We provide our clients with excellent service and quality. Whether you are looking to extend or upgrade, our professional team has the skills and e...

From £2,576

Last active Oct 26
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Saintflexs

Julian Cafun

Need an Extension Builder in Greater London? Saintflexs has been helping local clients (10 mile radius) with their extension buildering jobs for m...

From £2,384

Last active Oct 26
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Our Builders Ltd

Max Dixon

We are a construction company specialising in all aspects of building works, loft construction Extension complete home renovation, structural ...

From £2,192

Last active Oct 26
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Cre8tive Contractors Ltd

Cre8tive Contractors Ltd are here to help customers who need an Extension Builder in Greater London. We offer a competitive rate to complete all yo...

From £2,288

Last active Sep 26
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L M G Building Services (London) Ltd

Relax... you have found a reliable extension builder in Greater London. L M G Building Services (London) Ltd is a friendly and reliable company bas...

From £2,496

Last active Sep 26
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AAB Tile Installation & Repairs

AAB Tile Installation & Repairs are here to help customers who need an Extension Builder in Greater London. We offer a competitive rate to complete...

From £2,528

Last active Sep 26
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QUANTIC BUILDING SERVICES LTD

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

From £2,160

Last active Aug 26
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Rapid Bee Ltd

Rapid Bee Ltd is an established extension buildering business in Greater London. We come highly recommended and provide competitive quotes for your...

From £2,416

Last active Jun 26
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Aumosa Ltd

Experienced extension builder ready to quote for your work. Aumosa Ltd is the best extension builder in Greater London. No obligation free quotes a...

From £2,400

Last active Jun 26
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HA.ME.RA Building & Decoration

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

RSJ cost in Greater London

Estimates for install an rsj near Greater London

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Greater London it ranges from £2,160 (Rapid Bee Ltd based in SE12) to £2,576 (Saintflexs based in BR1).

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


Estimates for common extension builder jobs in Greater London;

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...