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 £2,448

Last active Nov 26
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Bspec Ltd

Mick Singh

At Building Services Contractors we pride ourselves on an efficient and friendly service, and strive to achieve 100% customer satisfaction.

From £2,224

Last active Nov 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 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 Holloway. We offer a competitive rate to complete all your ...

From £2,176

Last active Nov 26
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SLS BUILDERS LIMITED

SLS BUILDERS LIMITED is a trusted extension builder serving customers in Holloway and the surrounding area. Contact us to today to get a competitiv...

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 £2,600

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 Holloway. No obligation free quotes ...

From £2,392

Last active Oct 26
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London Trowel Co.

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

From £2,408

Last active Oct 26
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Thermodynamic Building Services Ltd

Trusted and professional extension builder in Holloway. Experienced in all extension buildering work and keeping within budget and on quote. Thermo...

From £4,520

Last active Oct 26
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Reid and Co Developments Ltd

Jay Reid

We are a well established buildng firm who have been providing building services and managing of projects now for 25 years. We have all the necessary ...

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 Holloway. First guard Roofing is a friendly and reliable company based in Holloway who cons...

RSJ cost in Holloway

Estimates for install an rsj near Holloway

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Holloway it ranges from £2,176 (SLS BUILDERS LIMITED based in NW5) to £4,520 (Reid and Co Developments Ltd based in NW8).

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

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


Estimates for common extension builder jobs in Holloway;

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...