How to Find a Trustworthy Contractor in Ontario: A Homeowner's Guide

Finding a trustworthy contractor in Ontario comes down to a handful of verifiable steps: confirm their licence or certification, check their WSIB clearance, read independent reviews, and look at an objective trust score before you sign anything.

That sounds simple. In practice, most homeowners skip two or three of those steps — and that is when things go wrong. This guide walks you through every check, in plain language, so you can hire with confidence.

Why Vetting Matters More Than Ever in Ontario

Ontario's renovation and home-services market is large and competitive. The vast majority of contractors are skilled, honest professionals who take pride in their work. But the size of the market also means a small number of operators cut corners — on insurance, on credentials, or on quality.

The stakes for a homeowner are real. A contractor without WSIB coverage can leave you personally liable if a worker is injured on your property. A tradesperson without the right licence can produce work that fails inspection, voids your home insurance, or creates a safety hazard. Getting this right at the start is far cheaper than fixing it later.

The good news: the information you need is almost entirely public. You just need to know where to look.

Step 1 — Confirm the Right Credentials for the Trade

Ontario regulates different trades differently. Before you hire anyone, know what credential applies to the work:

Browse all trade categories on ProScore to see which credentials are relevant for the specific work you need done.

Step 2 — Get a WSIB Clearance Certificate

The Workplace Safety and Insurance Board (WSIB) covers workers injured on the job. If a contractor is not registered with WSIB and a worker is hurt at your home, you could be held liable.

Ask every contractor for a WSIB Clearance Certificate before work begins. You can verify the certificate yourself at no cost through the WSIB's online portal. The certificate should be dated within the last 90 days.

Some sole-operator contractors are exempt from WSIB registration but must carry their own personal coverage or show you a valid exemption. Ask them to explain their situation in writing.

Step 3 — Verify Liability Insurance

A legitimate contractor carries general liability insurance — typically at least $2 million in coverage, though larger jobs often warrant more. This protects your property if something goes wrong.

Ask for the insurer's name and policy number, then call the insurer directly to confirm the policy is active and the coverage amount is what the contractor claims. It takes five minutes and can save you tens of thousands of dollars.

Step 4 — Read Reviews — But Read Them Critically

Online reviews are useful, but they are not the whole story. A few things to keep in mind:

Major review platforms are a starting point, not a finish line. They show you what past customers said — they do not verify credentials, insurance, or business transparency.

Step 5 — Use an Objective Trust Score

This is where independent scoring becomes valuable. ProScore's Trust Index methodology blends four inputs — a contractor's reputation, verified credentials, customer sentiment, and business transparency — into a single 0–100 score, displayed publicly as a tier: Elite, Trusted, Good, Basic, or Caution.

The score is calculated from 10+ data sources and 20+ trust signals, and it is updated continuously. When you look up a contractor on ProScore, you are not just seeing what they chose to share about themselves — you are seeing an independent assessment of whether their business holds up to scrutiny.

For trades where provincial licensing is not required — general contractors, roofers, landscapers — this kind of multi-signal scoring is especially useful, because there is no single government database to check.

Browse scored contractors by trade: General Contractors · Electricians · HVAC Contractors · Roofers

Step 6 — Get Multiple Written Quotes

For any job over a few hundred dollars, get at least three written quotes. A written quote should include:

A contractor who refuses to put any of this in writing is a contractor worth walking away from.

Step 7 — Check for Red Flags Before You Sign

Even after a contractor passes the credential and insurance checks, watch for these warning signs:

Frequently Asked Questions

What should I check before hiring a contractor in Ontario?

Check their trade-specific licence or certification (ESA for electricians, TSSA for gas fitters), request a current WSIB Clearance Certificate, verify their liability insurance directly with the insurer, read reviews across multiple sources, and look up their ProScore Trust Index tier to get an independent, multi-signal assessment of their business.

How do I know if a contractor is legitimate in Ontario?

A legitimate Ontario contractor will have verifiable credentials for their trade, active WSIB coverage or a valid exemption, general liability insurance they can document, a track record of reviews across independent platforms, and a willingness to provide a written quote and pull required permits. Trades that do not require a provincial licence — such as general contractors and roofers — should be assessed using independent trust scores alongside reviews.

What are the biggest red flags when hiring a contractor in Ontario?

The biggest red flags are: pressure to decide immediately, requests for large cash payments upfront, a quote dramatically lower than all others, reluctance to pull permits, no verifiable business address, and inability or unwillingness to provide WSIB clearance or proof of insurance. Any one of these warrants a serious pause before proceeding.

Make Your Next Hire a Confident One

Vetting a contractor properly takes an hour at most — and it is the single best investment you can make before a renovation or repair. Start with credentials and insurance, layer in independent reviews, and use ProScore's Trust Index to see how a contractor's full business profile holds up.

Search scored Ontario contractors on ProScore and hire with the confidence that comes from real data.