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 £2,248

Rates verified Sep 26
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J&J Building Solutions

Experienced extension builder ready to quote for your work. J&J Building Solutions is the best extension builder in CR7. No obligation free quotes ...

From £2,344

Last active Nov 26
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Greens Gardening & Landscape Property Maintenance

John Mcdonagh

Watch our short video highlighting all our expertise and services here:

more than 10 y...

From £3,400

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Banga Decoration

Sebastian Banga

Member since August 2025

Location

Thornton Heath, CR7

Banga decoration. Is Base in south London  for number of year  Banga decoration is a small  company. Wich provide an excellent job to the custom...

From £2,512

Last active Sep 26
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RAJANIS CONSTRUCTION

Relax... you have found a reliable extension builder in CR7. RAJANIS CONSTRUCTION is a friendly and reliable company based in CR7 who consider no j...

From £2,080

Last active Sep 26
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PROBUILDER

PROBUILDER is a trusted extension builder serving customers in CR7 and the surrounding area. Contact us to today to get a competitive quote for ext...

From £2,384

Last active Aug 26
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K S BUILDERS (UK) LTD

Trusted and professional extension builder in CR7. Experienced in all extension buildering work and keeping within budget and on quote. K S BUILDER...

From £2,440

Last active Aug 26
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VDL Construction Ltd

Location

Thornton Heath, CR7

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

VDL Construction Ltd provides a local, trusted extension...

From £2,328

Last active Aug 26
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Top Builders

Experienced extension builder ready to quote for your work. Top Builders is the best extension builder in CR7. No obligation free quotes and many h...

From £2,584

Last active Aug 26
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Howland Building Services

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

Howland Building Services provides a local, trusted exte...

From £2,152

Last active Aug 26
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A & P Master Construction

Experienced extension builder ready to quote for your work. A & P Master Construction is the best extension builder in CR7. No obligation free quot...

RSJ cost in CR7

Estimates for install an rsj near CR7

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in CR7 it ranges from £2,080 (PROBUILDER based in SW16) to £3,400 (Banga Decoration based in CR7).

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 CR7 by posting a job with HaMuch and we will send it to extension builders in CR7.


Estimates for common extension builder jobs in CR7;

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...