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. 

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Install an RSJ cost in Thornton Heath

Top Builders

From £2,328

Experienced extension builder ready to quote for your work. Top Builders is the best extension builder in Thornton Heath. No obligation free quotes...

Peng Construction & Property Maintenance

From £2,464

Peng Construction & Property Maintenance is an established extension buildering business in Thornton Heath. We come highly recommended and provide ...

Banga Decoration

From £3,400

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...

Building Plus Company London Ltd

From £2,416

Building Plus Company London Ltd is an established extension buildering business in Thornton Heath. We come highly recommended and provide competit...

VDL Construction Ltd

From £2,440

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

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

Croft Structural Engineers

From £2,168

Experienced extension builder ready to quote for your work. Croft Structural Engineers is the best extension builder in Thornton Heath. No obligati...

Atkins Builders

From £2,416

Experienced extension builder ready to quote for your work. Atkins Builders is the best extension builder in Thornton Heath. No obligation free quo...

Fredibuilder

From £2,720

Need an Extension Builder in Thornton Heath? Fredibuilder has been helping local clients (10 mile radius) with their extension buildering jobs for...

A & P Master Construction

From £2,152

Experienced extension builder ready to quote for your work. A & P Master Construction is the best extension builder in Thornton Heath. No obligatio...

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 £1,776 (M & J Building Construction based in CR7) 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.


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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...