Unless you’re a plumber yourself, usually the best choice when it comes to complicated plumbing repairs in your home is to hire a professional to do the job. However, there are some do’s and don’ts to follow when it comes to hiring a professional plumber.

Do’s

  • Communicate your needs effectively.
  • Always treat your contractor with consideration, courtesy, and respect.

  • Be flexible with the deadline in the event of unforeseen issues.
  • Be involved and stay on top of what’s going on with the project.
  • Take photos of the process from beginning to end.

Don’ts

  • Don’t get in the way.
  • Don’t expect anything for free – whether it is parts, work, or advice.
  • Don’t be a pushover in terms of pricing, deadlines or work involved.
  • Don’t complain – this doesn’t mean to not voice your concerns, just don’t harass the contractor with complaints about every little thing.
  • Don’t flip-flop on decisions and constantly change your mind about what you want done, as this will make the process both more expensive and frustrating for you both.

Source: http://plumbinghelptoday.com/denver-plumbing-repair-blog/2011/04/the-dos-and-donts-of-working-with-a-professional-plumber/