How to Choose a Contractor in Ontario (2026 Guide)
Verify licensing, insurance and WSIB, compare quotes, understand your contract and rights, and tell the green flags from the red.
In short
To choose a reliable contractor in Ontario: get at least three written, itemized quotes, verify licensing, insurance and WSIB coverage, check references and recent work, and insist on a detailed written contract. Keep deposits small (around 10%), tie payments to milestones, and walk away from cash-only deals, high-pressure tactics or anyone who won’t put it in writing.
Step 1: Define the job and gather quotes
A clear scope is what makes quotes comparable. Write down exactly what you want done, then ask each contractor to price the same thing.
What a complete quote should include
A vague one-line price is impossible to compare and easy to dispute later. A proper quote spells out every part of the job.
| Item | What to look for |
|---|---|
| Scope of work | Exactly what’s being done, room by room |
| Materials & brands | Specific products, grades and quantities |
| Labour | Crew size and hours, or a fixed price |
| Permits | Who pulls them and whether the fee is included |
| Timeline | Start and finish dates |
| Payment schedule | Deposit and milestone payments |
| Warranty | Coverage on labour and materials |
| Cleanup & disposal | Whether removal of debris is included |
Step 2: Verify licensing, insurance and WSIB
General “renovation contractors” aren’t provincially licensed in Ontario, but specific trades are compulsory — the people doing electrical, plumbing or gas work must be licensed. Always confirm credentials yourself.
Who needs a licence in Ontario?
Knowing which work is regulated tells you exactly what to verify before anyone starts.
| Type of work | Who can do it / how to verify |
|---|---|
| Electrical | Licensed Electrical Contractor — verify with the ESA |
| Plumbing | Licensed plumber (compulsory trade) — Skilled Trades Ontario register |
| Gas appliances & lines | TSSA-registered contractor with a certified gas technician |
| HVAC / heating & cooling | Licensed HVAC technician — Skilled Trades Ontario register |
| General renovation / carpentry | No provincial licence required — verify insurance, WSIB and references |
Step 3: Check reputation and past work
Step 4: Get everything in writing
A written contract is your main protection. In Ontario, consumer protection rules set out clear rights before and after you sign.
A typical payment schedule
Never pay in full upfront. Tie payments to completed work so the contractor is motivated to finish. A common structure looks like this:
| Stage | Typical share |
|---|---|
| Deposit on signing | ~10% |
| At project start / materials delivered | 15–25% |
| At a mid-project milestone (e.g. rough-in) | 25–30% |
| On substantial completion | remaining balance |
| Holdback (Ontario Construction Act) | 10% held back for the statutory period |
Ontario’s Construction Act lets you hold back 10% of the contract for a set period, which protects you against liens from unpaid subcontractors or suppliers.
Green flags: signs of a good contractor
Red flags: walk away from these
Questions to ask before you hire
During the project — and if something goes wrong
Good habits during the job protect you if a dispute comes up later.
Frequently asked questions
Get at least three written quotes, verify licensing, insurance and WSIB, check references and reviews, insist on a written contract, and avoid cash-only deals.
General contractors aren’t provincially licensed, but compulsory trades like electrical, plumbing and gas must be — verify those on the Skilled Trades Ontario register and ESA.
At least three itemized written quotes for the same scope of work.
Scope, materials, total price, payment schedule, start and finish dates and warranty — and it must be in writing for any job over $50.
Keep deposits small, around 10%, and never pay in full before the work is finished.
Cash-only deals, no written contract, no insurance or WSIB, large upfront deposits, high-pressure tactics and no fixed address.
In Ontario, the final price can’t exceed a written estimate by more than 10% without your written consent.
This guide is general information for Ontario homeowners, not legal advice. Ontario24 is a classified directory: we connect you with local businesses, we don’t vet them. Always verify licensing, insurance and references, and read your contract carefully before you hire.
Before you call anyone, it helps to know what this job should cost and what the next one will. What things cost in Ontario in 2026 puts 75 service prices in one table.