The cost of repiping my house....?

You should get some help from the home warranty people but good luck ? How old is the house and where do you live, and have any of your neighbors had the same problem?That will tell you if you can fix just the bathroom or if you need to repipe the whole house .In a housing developement near me the original contractor installed copper pipeing under the slab without checking the soil first . There was Boron in the soil which made quite a nice battery when you have moving water ,the copper started failing in some units after only 14 months . The developer had to replace the piping in the first 20 or so homes till the LLCs insurance and bonding ran out everyone else got the you know what . To replace the piping they didnt bother to cut any of the slabs they ran all new piping in the attics and insulated which meant cutting and patching all of the walls where there was plumbing. To figure an estimate for the plumbing count all of the items in your house that have water , If it has cold only add $200 dollars if it has hot and cold add $250 dollars so in other words a tipical bath with a toilet ,sink, and shower would be $700 for parts labor and insulation and thats just for the plumbing . That doesn't count the cutting patch and paint to repair walls . I had to fix my Cousins and we got it done for $12,000 and the sheetrockers and painters were good friends so she got a deal . Hope that helps Good Luck