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 S1 it ranges from £1,960 (A W Fascias based in S5) to £8,200 (C S Roofing & Building based in S8).

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 S1 by posting a job with HaMuch and we will send it to extension builders in S1.