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 £2,384

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 Belgravia. QA's Pointing and Brick Repair is a friendly and reliable company based in Belgr...

From £2,560

Last active Oct 26
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M & A UK Ltd

Relax... you have found a reliable extension builder in Belgravia. M & A UK Ltd is a friendly and reliable company based in Belgravia who consider ...

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 Belgravia. No obligation f...

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 Belgravia and the surrounding area. Contact us to today to g...

From £2,648

Last active Sep 26
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London Construction

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

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 Belgravia. We offer a competitive rate to complete all your extensi...

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 Belgravia. No obligation fre...

From £2,184

Last active Sep 26
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JK Doors

JK Doors is a trusted extension builder serving customers in Belgravia and the surrounding area. Contact us to today to get a competitive quote for...

From £2,240

Last active Sep 26
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JM Building Services

JM Building Services is a trusted extension builder serving customers in Belgravia and the surrounding area. Contact us to today to get a competiti...

RSJ cost in Belgravia

Estimates for install an rsj near Belgravia

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Belgravia 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 Belgravia by posting a job with HaMuch and we will send it to extension builders in Belgravia.


Estimates for common extension builder jobs in Belgravia;

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...