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 Thornton Heath. No obligation f...

From £3,400

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Banga Decoration

Sebastian Banga

Member since August 2025

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 £3,224

Last active Nov 26
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Buci builders ltd

Robert Buci

Buci builders ltd is a trusted extension builder serving customers in Thornton Heath and the surrounding area. Contact us to today to get a competi...

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 £2,392

Last active Nov 26
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Gb construction

Gani Bush

Gb construction are here to help customers who need an Extension Builder in Thornton Heath. We offer a competitive rate to complete all your exten...

From £2,184

Last active Oct 26

2 reviews

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RCB Group Design & Build

Vasi J

No Call out charges! 

All Jobs Fully Insured and Guaranteed !!!

All aspects of Plumbing, Heating and Drains....

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"I am very pleased with the work carried out. All very clear and transparent." - ROMFORD,reviewed 10/01/18, KELLY

From £2,240

Last active Oct 26
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PW Construction & Renovation Ltd

PW Construction & Renovation Ltd is a trusted extension builder serving customers in Thornton Heath and the surrounding area. Contact us to today t...

From £2,544

Last active Oct 26
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Glenn Miller Builders Limited

Glenn Miller

Relax... you have found a reliable extension builder in Thornton Heath. Glenn Miller Builders Limited is a friendly and reliable company based in T...

From £2,536

Last active Sep 26
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PRM BUILDING

Relax... you have found a reliable extension builder in Thornton Heath. PRM BUILDING is a friendly and reliable company based in Thornton Heath who...

From £2,520

Last active Sep 26
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QSA Builders Ltd

QSA Builders Ltd are here to help customers who need an Extension Builder in Thornton Heath. We offer a competitive rate to complete all your exten...

RSJ cost in Thornton Heath

Estimates for install an rsj near Thornton Heath

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in Thornton Heath it ranges from £2,184 (RCB Group Design & Build based in SE21) 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 Thornton Heath by posting a job with HaMuch and we will send it to extension builders in Thornton Heath.


Estimates for common extension builder jobs in Thornton Heath;

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...