cast iron main stack as well as drain

[ronthadon171]

How much would it be to change this system to pvc. i have a pipe that is slowly leaking as well as the drain pipe coming from the 2nd floor leaks big time. it's all cast iron but was thinking of converting to pvc. below are some pics

 

[johnjh2o]

Your looking at a major job even for a plumber. Not a DIY project.

John