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 £2,192

Last active Nov 26
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J.T.Construction

J.T.Construction is a trusted extension builder serving customers in St Helens and the surrounding area. Contact us to today to get a competitive q...

From £1,872

Last active Nov 26
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Fixit Cheshire

Fixit Cheshire is an established and experienced local extension builder in St Helens. Please contact us for a free, no obligation quote and compet...

From £1,920

Last active Nov 26
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JOHN ROSS BUILDERS LTD

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

JOHN ROSS BUILDERS LTD provides a local, trusted extensi...

From £2,024

Last active Nov 26
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Warrington Builders

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

From £1,864

Last active Nov 26
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KMC Brickwork

Need an Extension Builder in St Helens? KMC Brickwork has been helping local clients (20 mile radius) with their extension buildering jobs for many...

From £2,072

Last active Nov 26
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G. Finnigan Builders

G. Finnigan Builders is an established extension buildering business in St Helens. We come highly recommended and provide competitive quotes for yo...

From £1,808

Last active Nov 26
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M L R Building Services

Mark Robinson

Trusted and professional extension builder in St Helens. Experienced in all extension buildering work and keeping within budget and on quote. M L R...

From £1,800

Last active Oct 26
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SPL Building Services

Stephen Lowe

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

From £1,976

Last active Oct 26
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Jc Properties

Relax... you have found a reliable extension builder in St Helens. Jc Properties is a friendly and reliable company based in St Helens who consider...

From £2,136

Last active Oct 26
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P & P Building Services

Peter Gallagher

Experienced extension builder ready to quote for your work. P & P Building Services is the best extension builder in St Helens. No obligation free ...

RSJ cost in St Helens

Estimates for install an rsj near St Helens

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in St Helens it ranges from £1,800 (SPL Building Services based in WN3) to £2,192 (J.T.Construction based in WA5).

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


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Estimates for common extension builder jobs in St Helens;

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...