5 Red Flags When Hiring a Plumber in Ontario

Plumbing problems are urgent, stressful, and expensive. That combination makes homeowners vulnerable to contractors who cut corners, overcharge, or disappear mid-job. Here are five red flags that should stop you from hiring a plumber in Ontario.

1. They Demand Full Payment Upfront

No legitimate plumber requires full payment before work begins. Standard practice is a small deposit (10-15% maximum) with the balance due upon completion. If a plumber demands half or full payment before lifting a wrench, walk away.

What to do instead: Agree on a payment schedule tied to milestones. For a major job, this might be 10% deposit, 40% at rough-in, and 50% upon completion and inspection.

2. They Cannot Provide a License Number

Plumbing is a compulsory trade in Ontario: the person doing the work needs a Certificate of Qualification, or must be a registered apprentice, and you can check either on the Skilled Trades Ontario public register. The City of Toronto also licenses plumbing contractors, so in Toronto ask for that licence number too. A reputable plumber should be able to show you:

If they hesitate or refuse, that is a red flag.

3. Their Reviews Tell Different Stories on Different Platforms

A 4.9 on Google but complaints on the BBB suggests review manipulation. Cross-platform consistency is one of the strongest indicators of genuine quality. ProScore analyzes review patterns across multiple platforms to detect inconsistencies.

What to look for: Check at least two independent platforms. If ratings diverge significantly, dig deeper into the negative reviews for specifics.

4. They Give a Quote Without Seeing the Job

Any plumber who quotes a price over the phone without inspecting the work is either overcharging (padding for unknowns) or undercharging (planning to hit you with change orders). A reputable plumber will insist on seeing the job before quoting.

What to do: Get three in-person quotes. Compare scope, materials, and timeline — not just price.

5. They Pressure You Into an Immediate Decision

"This price is only good today" or "I have another job starting tomorrow" are high-pressure sales tactics. Legitimate contractors understand that homeowners need time to compare quotes and check references. Urgency manufactured by the contractor — not by the plumbing emergency — is a warning sign.

How ProScore Helps

ProScore helps you spot several of these before you call. Its AI sentiment analysis reads review text for patterns of pressure tactics, billing disputes, and inconsistent quality, and its cross-platform analysis catches review inconsistencies that individual platforms miss. It checks WSIB registration against WSIB records, and where it has matched a business, the profile says so. Insurance is self-declared, so ask for the certificate, and check the plumber's Certificate of Qualification on the Skilled Trades Ontario register yourself.

Search for plumbers at proscore.ca/providers/plumber to compare scored plumbers in your area.