Cost to fit an RSJ in W4

Install an RSJ cost in W4

RSJ cost in W4

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in W4 it ranges from £2,200 (SxS Design & Build based in W4) to £2,688 (Kuta Design and Build Limited based in W4).

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 W4 by posting a job with HaMuch and we will send it to extension builders in W4.

"UC beam install 2.5m only (calculations done, building control notification done, no pretty boxing etc.)" - TW8, job posted 03/09/26

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Borough in London
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Estimates for common extension builder jobs in W4;

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.