Free Plumber Interview Scorecard
Print one per candidate. Questions are grouped by area, each with a 1 to 5 rating and room for notes, so a service manager and a lead plumber rating two different candidates produce something comparable. The answer key for every question is on the interview questions page.
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Plumber interview scorecard
Reviewed September 8, 2026 · tradegrader.ai
Diagnosis
A customer has lukewarm water at every fixture and it runs out faster than it used to. Eight-year-old gas heater, lighting and staying lit. Where do you start?
Best for: Service, commercial
How do you tell whether a recurring drain problem is the fixture, the branch, or the main?
Best for: Service, drain
Tell me about a call you misdiagnosed.
Best for: All roles
Code and systems
Why does a fixture need a vent?
Best for: All roles
What have you run into working on older buildings that doesn't come up on new work?
Best for: Service, drain
When does a job you're on need a permit and an inspection?
Best for: All licensed roles
Gas and safety
Walk me through what you do before and after a water heater replacement on the gas side.
Best for: Service, commercial
You find a condition that isn't safe and the customer doesn't want to pay to fix it. What happens?
Best for: All roles
Customer-facing judgment
How do you present options when the right repair is the expensive one?
Best for: Service, drain
You find previous work that's dangerous. How do you talk to the customer about it?
Best for: All customer-facing roles
Their last shop
What was your split between service, drain, and new construction?
Best for: All roles
What would have kept you?
Best for: All roles
How were you dispatched and how was your work reviewed?
Best for: Service, drain, commercial