If you're able to do the plumbing in your house by yourself then it can cost $500.00 or less.
The only cost you'll have is the plumbing fittings and pipe and any faucets or other hardware you need.
Plumbing is very easy to learn but you might have to have a professional do it if you need to have it inspected.
Cost to redo all the plumbing in a house from a plumber can range from $3,000.00 to $4,000.00