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 Get quotes.

HaMuch is Excellent

Install an RSJ cost in Old Broad Street - Sort by rates or availability

From £2,248

Member since October 2026

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Sparkcleanrepair

Khalid Osman

We agree on the work, price and appointment before starting. Our approach focuses on clear communication, punctuality, careful workmanship and leav...

From £2,392

Last active Oct 26
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London Trowel Co.

Relax... you have found a reliable extension builder in Old Broad Street. London Trowel Co. is a friendly and reliable company based in Old Broad S...

From £2,408

Last active Oct 26
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Thermodynamic Building Services Ltd

Trusted and professional extension builder in Old Broad Street. Experienced in all extension buildering work and keeping within budget and on quote...

From £2,224

Last active Oct 26
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SH Enterprise

Need the extension buildering job done quickly without breaking the bank? SH Enterprise offer fast, reliable, and affordable extension buildering s...

From £2,392

Last active Oct 26

1 review

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Torrington

Torrington Design

NIECEIC / NAAPIT GASSAFE WATER REGULATIONS We offer services towards completion of high end construction projects to dis...

"Did callout made safe my elctrical work thanks" - reviewed 16/05/23, REECYRUSSO

From £2,272

Last active Oct 26
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Glenward Builders Ltd

Experienced extension builder ready to quote for your work. Glenward Builders Ltd is the best extension builder in Old Broad Street. No obligation ...

From £2,576

Last active Sep 26
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CK Constructions & Development Ltd

CK Constructions & Development Ltd is a trusted extension builder serving customers in Old Broad Street and the surrounding area. Contact us to tod...

From £2,176

Last active Sep 26
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A to Z Builders Ltd

A to Z Builders Ltd are here to help customers who need an Extension Builder in Old Broad Street. We offer a competitive rate to complete all your ...

From £2,448

Last active Sep 26
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Cornerstones Construction

Experienced extension builder ready to quote for your work. Cornerstones Construction is the best extension builder in Old Broad Street. No obligat...

From £2,184

Last active Sep 26
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JK Doors

JK Doors is a trusted extension builder serving customers in Old Broad Street and the surrounding area. Contact us to today to get a competitive qu...

RSJ cost in Old Broad Street

Estimates for install an rsj near Old Broad Street

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Old Broad Street it ranges from £2,176 (A to Z Builders Ltd based in SW1P) to £2,576 (CK Constructions & Development Ltd based in WC1N).

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


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Estimates for common extension builder jobs in Old Broad Street;

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...