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. 

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in SE20 it ranges from £1,800 (Livo builders based in Br3) to £2,144 (Shapti Construction based in SE25).

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 SE20 by posting a job with HaMuch and we will send it to extension builders in SE20.