Ontario Contractor Vetting Guide 2026 - Red Flags, Verification and Fraud Prevention

Canada Ontario
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Contractor fraud costs Ontario homeowners hundreds of millions of dollars annually. Recognizing red flags and verifying credentials before signing protects your home and finances.

Top Red Flags in Ontario

Large deposit demand: Legitimate contractors for projects under $50,000 should not require more than 10% upfront. Any contractor demanding 30-50% before work begins is a major red flag. Never pay cash without a receipt.

No WSIB clearance certificate: Protects you from liability if a worker is injured on your property. Request a printout from wsib.ca/clearance — not the worker’s wallet card. Verify current, valid coverage.

No HST number: Contractors doing over $30,000/year must be HST-registered. “Pay cash to avoid HST” = tax evasion. Verify at canada.ca. You can be held jointly liable.

No written contract: Always insist on written scope, materials, schedule, and payment terms before work begins.

Pressure tactics: “This price is only valid today” or “crew available Monday” are red flags. Legitimate contractors don’t pressure. Walk away.

Door-to-door after storm: Following GTA hailstorms or ice storms, unlicensed predatory contractors solicit aggressively. Never hire a contractor who appeared the day after the storm.

Contractor Verification Checklist

  • WSIB clearance: wsib.ca/clearance
  • HST registration: canada.ca/cra
  • HomeStars/Google reviews: 4.0+ with 10+ reviews
  • BBB rating: bbb.org
  • ESA licence (electricians): esasafe.com
  • TSSA licence (gas fitters): tssa.org
  • New home builders: hcraontario.ca

Related guides on home.renovation.reviews

Got burned by a contractor — or vetted one and want to share what worked? Reply with what tipped you off (or what you wish you had checked). Real Ontario stories help the next homeowner avoid the same mistake.

GTA HVAC Spring 2026: Tune-up Timing + $10K Rebate Stack
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Good baseline checklist. A few things worth adding from 50+ years of renovation work across the GTA.

On the written contract: the line items matter as much as having a contract at all. A lot of Ontario homeowners sign a one-page agreement that says “kitchen renovation per quote — $28,000.” That is not a contract. A proper renovation agreement should include: specific scope of work (demo scope, materials by brand and model number, finish selections confirmed in writing), a payment milestone schedule tied to stage completion not calendar dates, a change order clause that spells out exactly how scope additions are priced and approved, and a 10% holdback retention held until final walkthrough sign-off. No exceptions.

One practical protection most homeowners miss: pay the initial deposit by credit card, not e-transfer. The standard 10% deposit on a $50,000 project is $5,000. A credit card gives you chargeback rights if the contractor takes the money and disappears or abandons the job. Some contractors will not accept it. That tells you something.

On WSIB specifically: the clearance certificate must be dated within 90 days of your project start date. An old certificate is not valid. Print it yourself directly from wsib.ca/clearance using the contractors WSIB account number. Do not accept a PDF the contractor emails you. That PDF could be anything.

On HomeStars: it is worth checking but read the 3-star reviews, not just the 5-star ones. The 3-star reviews are where you find the actual operational patterns. How the contractor handles delays, change orders, and cleanup. The 5-star reviews tell you they showed up. The 3-star reviews tell you who they are when things get complicated.