Why should your labor be any different from trimming shrubs v.s. moving shrubs? your giving the home owner materials at your cost? Not even marking them up? How do you expect to make money?
Are you able to set aside enough money once the job is done to pay taxes on? Is there enough money figured into the labor to pay for your labor for going to get the materials? Or is your time free when your traveling in a vehicle that does not burn fuel?