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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phoenix builders

phoenix builders is a trusted extension builder serving customers in M1 and the surrounding area. Contact us to today to get a competitive quote fo...

From £1,936

Last active Nov 26
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J K S Builder

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

J K S Builder provides a local, trusted extension builde...

From £1,832

Last active Oct 26
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Brookmeade Building

Brookmeade Building is an established extension buildering business in M1. We come highly recommended and provide competitive quotes for your work....

From £2,088

Last active Oct 26
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Denis Gleeson

Denis Gleeson is an established extension buildering business in M1. We come highly recommended and provide competitive quotes for your work.

From £2,088

Last active Oct 26
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Advanced Builders & Roofers

Experienced extension builder ready to quote for your work. Advanced Builders & Roofers is the best extension builder in M1. No obligation free quo...

From £1,968

Last active Sep 26
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B R M S

Trusted and professional extension builder in M1. Experienced in all extension buildering work and keeping within budget and on quote. B R M S have...

From £2,000

Last active Aug 26
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Silkrise Construction

Our building services company Silkrise Construction have ten years’ experience and have been helping customers in Manchester and the surrounding ...

From £2,184

Last active Aug 26
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Wholesale Clothing

A wholesale shopping is an individual with a huge number of followers related to fashion and has the ability to influence the thought and purchase ...

From £1,952

Last active Aug 26
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JM Builders Service

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

JM Builders Service provides a local, trusted extension ...

From £2,056

Last active Aug 26
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Cornerstone Building Maintenance & Restoration Ltd

Cornerstone Building Maintenance & Restoration Ltd is an established and experienced local extension builder in M1. Please contact us for a free, n...

RSJ cost in M1

Estimates for install an rsj near M1

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in M1 it ranges from £1,832 (Brookmeade Building based in M32) to £2,184 (Wholesale Clothing based in M8).

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 M1 by posting a job with HaMuch and we will send it to extension builders in M1.

"RSJ installation replacing a badly installed RSJ that supports a wall between the old kitchen and rear lounge. The original builder installed the incorrect weight (not heavy enough) and then proceeded to put a suppirt bar underneath by welding. The weld buckled the beam and this is how its been..." - SK4, job posted 01/01/70

"Install an RSJ" - M27, job posted 09/02/26


Get extension builder rates instantly

Get extension builder rates instantly (excluding VAT or callout charges)
Location in UKHourly RateDaily Rate
Install An RSJ near Manchester£32£236
Install An RSJ near Old Trafford£32£236
Install An RSJ near Salford£32£237
Install An RSJ near Stretford£32£239
Install An RSJ near Droylsden£34£237
Install An RSJ near Prestwich£31£233
Install An RSJ near Failsworth£35£236
Install An RSJ near Reddish£34£235
Install An RSJ near Swinton£32£234
Install An RSJ near Eccles£32£236

Estimates for common extension builder jobs in M1;

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...