This Article from the Home Advisor Website
Sooner or later we all need to call a plumber. A plumber is expensive and there's no way around that. But, there are a variety of ways to get the most value for your money.
1. Compare Plumbers' Hourly Rates
2. Minimize Plumbing Needs
3. Buy Your Own Plumbing Fixtures
4. Reduce the Plumber's Chargeable Time
5. Install Water-Saving Plumbing Fixtures
6. Remodel the Smart Way
Always get a fixed price for the job and make sure that model numbers are clearly indicated in the contracts you sign. If the plumber installs the wrong fixture and you can't figure out whose fault it is, you can have a real problem.