Short answer
Check the plumber's license with your state or local board, ask for proof of insurance, and get a written price or clear rate before work starts. For bigger jobs, ask who pulls the permit.
License and insurance
Most states license plumbers, and some cities or counties license them locally. Ask for the license number and check it. Ask for a certificate of liability insurance too. Our state pages name where to look.
How pricing usually works
Some plumbers charge a flat price per job; others charge a trip or diagnostic fee plus time and materials. Nights, weekends and holidays often cost more.
- Ask for the call-out or diagnostic fee up front
- Get a written scope for anything beyond a simple repair
- Ask what's warrantied and for how long
Permits
Water heater replacements, repipes, sewer line work and gas line work usually need a permit and inspection. The plumber normally pulls it; make sure it's in the quote.
Questions
Should I get more than one quote?
For planned work like a repipe, sewer replacement or water heater, comparing quotes is reasonable. For an active leak, stopping the water comes first.
Is a cheaper quote always a red flag?
Not always, but compare the scope line by line: permits, materials, disposal and warranty are where quotes differ most.
What license classifications exist for residential plumbers?
Most states differentiate between apprentice, journeyman, and master plumbers. Licensed plumbing contractors employ master plumbers and carry required commercial general liability and workers' compensation coverage.
Who is responsible for pulling permits for plumbing work?
The licensed plumbing contractor should always pull the required municipal permits. Homeowners should avoid contractors asking them to pull 'owner-builder' permits for contracted work.
This guide is general information, not professional, legal or insurance advice. Follow your insurer's instructions and local codes, and put safety first.