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.

HaMuch is Excellent

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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 Hornsey. We offer a competitive rate to complete all your e...

From £2,600

Last active Oct 26
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Five Star Builder

Experienced extension builder ready to quote for your work. Five Star Builder is the best extension builder in Hornsey. No obligation free quotes a...

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 £2,392

Last active Oct 26
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London Trowel Co.

Relax... you have found a reliable extension builder in Hornsey. London Trowel Co. is a friendly and reliable company based in Hornsey who consider...

From £2,368

Last active Oct 26
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Best Builders

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

From £2,384

Last active Sep 26
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First guard Roofing

Darren Bergin

Relax... you have found a reliable extension builder in Hornsey. First guard Roofing is a friendly and reliable company based in Hornsey who consid...

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 Hornsey and the surrounding area. Contact us to today to get a competitive ...

From £2,184

Last active Aug 26
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Andreas Thomas Demetri

Andreas Thomas Demetri is a trusted extension builder serving customers in Hornsey and the surrounding area. Contact us to today to get a competiti...

From £1,520

Last active Aug 26
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Onyx Iv

Ivaylo Shkodrov

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

RSJ cost in Hornsey

Estimates for install an rsj near Hornsey

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Hornsey it ranges from £1,520 (Onyx Iv based in N11) to £2,600 (Five Star Builder based in N16).

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

"RSJ re-installation" - N16, job posted 04/10/25


Estimates for common extension builder jobs in Hornsey;

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...