The long water lines have been replaced under the house, but not the lines in the wall. What would the cost be for kitchen, 1 full and one 3/4 bath?

Impossible. Too many questions. We don't even know where you live. Get 3 quotes.

NYC or Mississippi, union or non union, what type of material, how long, what kind of access? What did you pay for the replaced lines? Impossible to give you an answer.

I agree ,just get 3 bids and go with the middle bid in most cases