How do I know if my plumber is licensed?

In Ontario, plumbers must be licensed through the Ontario College of Trades (OCOT), and you can easily verify their credentials online before hiring.

Checking Your Plumber's License

The most reliable way to verify a plumber's license is through the Ontario College of Trades website at collegeoftrades.ca. Use their "Find a Tradesperson" search tool where you can enter the plumber's name or certificate number. A legitimate plumber will have a Certificate of Qualification in Plumbing, and many also carry additional certifications for gas fitting or backflow prevention.

Licensed plumbers in the GTA should also carry proper insurance coverage, including general liability and WSIB coverage. Don't hesitate to ask for proof of insurance before work begins - reputable contractors expect this question and will readily provide documentation. For gas line work specifically, plumbers need additional TSSA (Technical Standards and Safety Authority) certification, which you can verify separately through tssa.org.

Red Flags and Warning Signs

Be cautious of contractors who can't provide a license number, offer significantly below-market pricing, or pressure you to start work immediately. In Toronto's competitive market, legitimate plumbers are typically booked 1-2 weeks in advance for non-emergency work. Door-to-door solicitation is another major red flag - licensed professionals rarely need to cold-call for business.

Toronto-Specific Considerations

The City of Toronto requires plumbing permits for most work beyond simple repairs, and only licensed plumbers can pull these permits. If your project involves moving fixtures, installing new water lines, or any work on the main stack, permits are mandatory. Licensed plumbers understand Toronto's specific requirements, including the city's backwater valve rebate program and requirements for basement apartment conversions.

Professional Protection

Working with licensed plumbers protects you legally and financially. Their work is covered under Ontario's skilled trades regulations, and they're required to follow the Ontario Building Code. If issues arise, you have recourse through the College of Trades complaint process. Additionally, insurance companies may deny claims for damage caused by unlicensed work.

Next Steps

Before hiring any plumber, verify their license online, request proof of insurance, and ensure they'll obtain proper permits. For emergency situations, focus on safety first, but still verify credentials before authorizing major repairs. Browse verified contractors in our directory at Toronto Construction Network to find pre-screened, licensed plumbers in your area.