The estimated cost to refit a 1,500 square foot home with copper plumbing could be anywhere from $10,000-$15,000. The cost of copper piping is about $2-6 per foot, depending on the size and type of pipe. Most of the cost of refitting a home comes from having to open up the walls and ceilings to access the plumbing. If you’re planning on refitting your home with a new plumbing system, it makes sense to do it during a larger renovation project when things are already being ripped open.