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
In Ontario, the final price can’t exceed a written estimate by more than 10% without your written consent.
Cash-only deals, no written contract, no insurance or WSIB, large upfront deposits, high-pressure tactics and no fixed address.
Keep deposits small, around 10%, and never pay in full before the work is finished.
Scope, materials, total price, payment schedule, start and finish dates and warranty — and it must be in writing for any job over $50.
At least three itemized written quotes for the same scope of work.
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.
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.
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.