Within the scope of the project, lines 4 and 6 will be rebuilt between Széll Kálmán tér (formerly Moscow Square) and Margithíd bridge and the whole of Line 17 will be upgraded. In the second phase, a new connection will be constructed between Margithíd bridge and Batthyány-tér.

The total cost of the project will be Fornits 10bn ($US 46m), with 83.4% of the funds coming from European Union sources. If the tender is successful, construction could start in the second quarter of 2014, with completion scheduled for June 2015.