My 52 year old house had mixed copper and mostly galvanized plumbing. I was given a carefully explained quote for the lateral runs, hoping the copper pipes reached down far enough.
The day of work, they showed up on time as promised (a rarity in the remodel construction world). The work crew of 4 plumbers, inspected the pipes by going into the crawl space. The copper pipies did not go down to the laterals so the walls would have to be opened up, including the double showers. They had a matching brass plate to fit the new hole in the shower, we agreed on the additional work and price. Then they started to work and were done early.
I still paid 30 less than I expected.
All follow up work with the city inspectors was done the next day, the wholes patched and re-inspected by the city, over the next 2 days.
No leaks no problems and they even fixed my water line to the refrigerator when it plugged up from all of the old debris still in the pipe. The guys knew what they are supposed to do.