Regardless of what type of work you are doing as a plumber, you should always have a Plumbing Contract. The benefits outlined below might help your decision-making: There is no confusion about the payment schedule A project timeline is established Roles and responsibilities are understood by everyone If you don't have a Plumbing Agreement, you might experience the following repercussions: unrealistic expectations, unmet standards of quality, unclear deadlines, challenges collecting payment, and, not to mention, little to no legal recourse if a dispute arises.