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 £2,552

Last active Oct 26
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R Tredget & Son

Location

Kent, DA15

R Tredget & Son are here to help customers who need an Extension Builder in DA15. We offer a competitive rate to complete all your extension builde...

From £2,816

Last active Oct 26
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HOUSE BUILDING SERVICES LIMITED

Tommy House

HOUSE BUILDING SERVICES LIMITED is a trusted extension builder serving customers in DA15 and the surrounding area. Contact us to today to get a com...

From £2,456

Last active Sep 26
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Lover Build

Lover Build is an established and experienced local extension builder in DA15. Please contact us for a free, no obligation quote and competitive ra...

From £2,072

Last active Sep 26
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AMJAC CONSTRUCTION LTD

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

AMJAC CONSTRUCTION LTD provides a local, trusted extensi...

From £2,240

Last active Sep 26
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Pro-Tec Roofing & Building Services Ltd

Location

KENT, DA15

Pro-Tec Roofing & Building Services Ltd is an established and experienced local extension builder in DA15. Please contact us for a free, no obligat...

From £2,192

Last active Apr 26
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Neris Building Solutions Ltd.

Neris Building Solutions specialising in building of loft conversions, home extensions and home refurbishments.

From £2,512

Last active Apr 26
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Direct Roofing

Location

Sidcup, DA15

Direct Roofing is an established and experienced local extension builder in DA15. Please contact us for a free, no obligation quote and competitive...

From £2,128

Last active Apr 26
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PARAMOUNT CONSTRUCTION (UK)

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

From £2,504

Last active Apr 26
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Altash Building Services

Experienced extension builder ready to quote for your work. Altash Building Services is the best extension builder in DA15. No obligation free quot...

From £2,200

Last active Apr 26
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Self employer

Darius Kudzevicius

Trusted and professional extension builder in DA15. Experienced in all extension buildering work and keeping within budget and on quote. Self emplo...

RSJ cost in DA15

Estimates for install an rsj near DA15

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in DA15 it ranges from £2,072 (AMJAC CONSTRUCTION LTD based in SE9) to £2,816 (HOUSE BUILDING SERVICES LIMITED based in DA16).

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 DA15 by posting a job with HaMuch and we will send it to extension builders in DA15.

"RSJ installation - check if we need one installed" - ELTHAM, job posted 01/06/25


Estimates for common extension builder jobs in DA15;

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...