how much does it cost to replace the plumbing system
1 PEX piping costs around $.50 to $2.00 per foot, while copper piping averages $2 to $4 per foot. 2  Replacing only exposed piping can reduce the project cost by as much as 50 to 60 percent. 3  Pipe replacement during a renovation results in even greater savings. Using PEX pipes for the same project can reduce costs by around half ($4,000 to $8,000). 2  PEX piping costs around $.50 to $2.00 per foot, while copper piping averages $2 to $4 per foot.