How much does it cost to replace galvanized pipes? A galvanized pipe replacement for an average 2 bathroom home costs between $8,000 and $10,000 when installing copper in its place. A whole house plumbing replacement in an average two bathroom home costs between $4000-$6000 when install pex.Click to see full answer. Similarly, how much does it cost to replace galvanized steel pipes? Average Cost to Replace Galvanized Pipes The cost to replace galvanized pipes is from $2,000 to $15,000 depending on if you use PEX, copper, or another material. Replacing galvanized pipes in older homes is important because of the way galvanized pipes tend to degrade over the years.Secondly, should galvanized pipes be replaced? If some of your taps have low water pressure, but others don’t, this could be a symptom of galvanized pipes. Corrosion can build up unevenly. Also, part of the galvanized pipe line could have been replaced in your home, but not everywhere. Galvanized pipes can release iron and cause discoloration. Thereof, can you replace galvanized pipe with PVC? Although galvanized pipes are coated inside and out to prevent rust, they rust inside and will corrode over time, causing a build-up that restricts the flow of water, and/or the pipe may leak. Galvanized pipes are typically replaced with PEX, PVC-CPVC or copper pipes.How much does it cost to replace plumbing pipes?Replacing all of the plumbing in a 1,500 square foot, two-bathroom home with copper piping costs between $8,000 and $10,000. But using PEX would cost just $4,000 to $6,000, according to Gove. That’s because of lower material and labor costs.