I have seen instances where the customer wants a breakdown on rough-in and then a finish, I make them sign for all of it up front,get paid up front for all materials and in Minnesota they have to pull a seperate permit for there own work (another 80.00) I will let no one work on my permitted job. Contact your local inspector, they should be able to help protect against that, I understand how it is,A guy does a nice rough in and gets his bid gutted by a homeowner and his buddy (a retired electrician, they spend weeks pumping you for the information needed to finish the job.