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 £2,648

Last active Nov 26
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London Construction

London Construction is an established and experienced local extension builder in Chelsea. Please contact us for a free, no obligation quote and com...

From £2,384

Last active Nov 26
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QA's Pointing and Brick Repair

QA's Pointing Brick Repair

Relax... you have found a reliable extension builder in Chelsea. QA's Pointing and Brick Repair is a friendly and reliable company based in Chelsea...

From £2,456

Last active Oct 26
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Red Box Maintenance Ltd

Red Box are a Fulham-based building and decorating business who work in West and Southwest London, and who specialise in fine interior renovations,...

From £2,560

Last active Oct 26
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M & A UK Ltd

Relax... you have found a reliable extension builder in Chelsea. M & A UK Ltd is a friendly and reliable company based in Chelsea who consider no j...

From £2,648

Last active Oct 26
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AJ Wells

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

AJ Wells provides a local, trusted extension buildering ...

From £2,368

Last active Oct 26
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Newpark Construction

Newpark Construction are here to help customers who need an Extension Builder in Chelsea. We offer a competitive rate to complete all your extensio...

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 £2,520

Last active Sep 26
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D & G Building & Decorating

Experienced extension builder ready to quote for your work. D & G Building & Decorating is the best extension builder in Chelsea. No obligation fre...

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 Chelsea and the surrounding area. Contact us to today to get...

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 Chelsea. We offer a competitive rate to complete all your extension...

RSJ cost in Chelsea

Estimates for install an rsj near Chelsea

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Chelsea it ranges from £2,176 (A to Z Builders Ltd based in SW1P) 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 Chelsea by posting a job with HaMuch and we will send it to extension builders in Chelsea.


Estimates for common extension builder jobs in Chelsea;

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...