Can You Sue a Contractor for Bad Work in Ontario?
In Ontario, a homeowner may sue a contractor for defective work as a breach of contract, as negligence, or as both. A contract for renovation work typically carries an implied term that the work be performed in a good and workmanlike manner, and the Consumer Protection Act, 2002 adds a deemed warranty that services supplied to a consumer are of a reasonably acceptable quality. Claims of $50,000 or less typically proceed in the Small Claims Court, and larger claims proceed in the Superior Court of Justice. Under the Limitations Act, 2002, a claim must typically be started within two years of the day the problem was discovered, which is often later than the day the work finished. Courts typically measure damages by the reasonable cost of putting the work right, so a written deficiency list and repair quotes often carry more weight than the size of the original contract.
The work looked finished on the day the crew packed up. A few months later the grout lines opened, a door stopped closing, and water appeared where it had no business being. You called. The contractor answered twice, promised to come back, then stopped answering at all.
Thousands of Ontario homeowners land in that gap every year, between work that was paid for and work actually done properly. Renovation problems sit among the most common consumer complaints in the province.
You may have more options than you think, and going to court is rarely the first one. This guide covers what counts as bad work under Ontario law, how to build a record that supports a claim, what belongs in a demand letter, and which court hears the claim if it comes to that.
Quick Start: Which Situation Are You In?
Not every renovation dispute is the same issue, and the first step varies for each one.
If the work is finished but defective, your first step is to record the deficiencies before anything is repaired.
If the contractor started and walked away, record what was actually completed and get the cost of finishing it quoted.
If a deposit was taken and nothing was ever started, you have a claim for money rather than a claim about workmanship.
If you held back payment and a lien has since appeared on your title, that path moves quickly. Get advice before a deadline passes.
What Counts as Bad Work Under Ontario Law
Not every disappointment is a deficiency. A finish you chose and no longer like is not defective work. A cabinet run out of level, a roof that leaks in the first rain, or tile laid over an unprepared subfloor are deficiencies: departures from what the contract or the standard required.
The Consumer Protection Act, 2002 adds protection on top of the contract. It deems a supplier to warrant that services supplied to a consumer are of a reasonably acceptable quality, whether or not anyone wrote it down. Where the disagreement is really about price, a dispute over a contractor’s invoice follows a different path.
Two Ways to Frame a Claim Against Your Contractor
The contract route is usually simpler. You agreed on a scope, you paid, and what was delivered does not match what was promised. The person on the other side of that claim is the person you contracted with.
Negligence rests instead on a duty to carry out the work with reasonable skill and care. Because that duty does not depend on a contract, it may reach a subcontractor you never met, which matters when the company you hired has closed its doors.
Many homeowners advance both at once. Because they carry different evidence burdens, our civil litigation lawyers look at which one the documents support before anything is filed.
| Breach of contract | Negligence | |
|---|---|---|
| What the claim rests on | The agreement between you and the contractor, including the implied term that the work be performed in a good and workmanlike manner. | A duty to carry out the work with reasonable skill and care. That duty exists whether or not there is an agreement. |
| Who may be sued | The party you contracted with. | The party you contracted with, and potentially a subcontractor or trade you never hired. |
| What typically has to be shown | What was agreed, that the work departed from it, and the loss that followed. | The standard a competent contractor would meet, that the work fell below it, and the loss that followed. |
| Is a written contract needed | No. Texts, emails, quotes, and conduct may establish what was agreed. | No. The duty does not depend on a contract existing at all. |
| When the clock typically starts | The day the problem was discovered, not the day the work finished. | The day the problem was discovered, not the day the work finished. |
| What the usual remedy is | The reasonable cost of putting the work right. | The reasonable cost of putting the work right. |
Build the Record Before You Build the Claim
Before you tear anything out, photograph it. Repairing first is the most common way a good claim gets weakened. Once the defective work is gone, proving it existed becomes an argument rather than a fact.
Date every photograph and take more than you think you need, including wide shots that show where each defect sits in the room.
Then write a deficiency list. A deficiency list is a written, itemized record of everything that was done incorrectly or left undone, with a location for each item. Keep it factual and specific. “Hallway floor, three cracked tiles at the doorway” is better than just “bad tile work.”
Gather the original quote, the contract, any change orders, and every text or email about the work. Then get written repair quotes from two or three other contractors. Those quotes typically become the measure of what you are claiming.
Send a Demand Letter Before You File
Most homeowners skip this step and start looking for a courthouse. That is usually a mistake. A clear letter attached to a deficiency list and two repair quotes tells a contractor the file is organized, and organized files settle more often than angry phone calls do.
Keep the tone level, and write it assuming a judge may read it later. A letter that threatens, exaggerates, or demands an amount that the quotes do not support can be handed back to you at a settlement conference.
Set a reasonable deadline to respond, typically one to two weeks, and send it through a method that gives you proof of delivery. Keep a copy of everything you send.
Which Court Hears a Contractor Claim in Ontario
The figure that matters is the cost of putting the work right, not the price of the original contract. A $90,000 kitchen with a $12,000 repair bill is a Small Claims matter.
The limit is set by regulation and can change, so confirm the current figure before you file. If you are weighing the two forums, which court hears your claim covers the filing steps, the costs, and what happens after judgment.
How Long You Have to Sue in Ontario
A separate 15-year outer limit runs from the day the work was done. Whichever deadline arrives first is the one that applies.
Sending a demand letter does not stop the clock. Only issuing a court document does. If you are nearing two years from the day you first noticed the problem, have the two-year limitation clock assessed now rather than later.
If Your Contractor Puts a Lien on Your Home
Withholding payment feels like leverage. It can also invite a response.
Under the Construction Act, a contractor or subcontractor who has not been paid may register a construction lien against your property. A construction lien is a legal claim registered on the title to your home for work or materials that improved it. The window is short: typically 60 days to register it, and a further 90 days to take it to court.
Your protection is the 10 per cent statutory holdback, the portion of each payment you are required to retain as the work proceeds. The 10 per cent holdback explains how it works, and Nihang Law handles construction lien disputes for GTA owners.
From Deficiency List to Filed Claim: Step by Step
Seven steps take a renovation dispute from frustration to a claim a court can deal with.
- 1Record the deficiencies.Photograph everything, date it, and write the itemized list before any repair begins.
- 2Get the repair quoted.Two or three written quotes from other contractors set the value of the claim.
- 3Send the demand letter.Set out the deficiencies, what you are asking for, and a reasonable deadline.
- 4Confirm who you are actually suing.Use the contractor’s registered legal name, not the name on the truck. A judgment against the wrong entity may be unenforceable.
- 5Check the limitation date.Count from the day you discovered the problem, and have that date confirmed before you rely on it.
- 6Choose the forum.Compare the cost of the repair against the $50,000 Small Claims ceiling.
- 7File and serve.In the Small Claims Court, a settlement conference follows, and many claims resolve there. Where cost is a concern, representing yourself in Small Claims Court is a realistic option for a straightforward claim.
Where Homeowners Go Wrong
- ▪Withholding payment without a documented basis. Stopping payment before the deficiencies are recorded and quoted may put you in breach and may invite a lien on your title.
- ▪Repairing the defect before recording it. Once the evidence is gone, the argument gets harder. Photograph first, then fix what needs to be fixed.
- ▪Suing the wrong name. “ABC Renovations” is often a trade name. A judgment needs the registered legal name behind it.
- ▪Counting the deadline from the wrong day. The clock typically runs from discovery, which cuts both ways. Do not assume you are out of time, and do not assume you have plenty.
- ▪Letting the contractor keep coming back with nothing in writing. Repeated visits that go nowhere burn months. Confirm in writing what is being fixed and by when.
- ▪Claiming an amount that the quotes do not support. Damages are typically measured by the reasonable cost of the repair, not by how the experience felt.
Questions Ontario Homeowners Ask About Suing a Contractor
My contractor did a bad job and stopped answering — what can I do?
Can I refuse to pay my contractor for bad work?
Can I sue a contractor if I never signed a written contract?
How long do I have to sue a contractor in Ontario?
Do I need an expert report to prove the work was bad?
My contractor took a deposit and never started — is that different?
Who do I report a bad contractor to in Ontario?
Getting Advice Before the Deadline Passes
A contractor dispute is usually won or lost on the record rather than on the argument. Dated photographs, an itemized deficiency list, and written repair quotes turn a frustrating experience into a claim with a figure attached. Your deadline can be assessed, and it often falls later than homeowners fear.
Qasim Ali, Principal Lawyer at Nihang Law and the firm’s litigation team review renovation disputes for homeowners across Toronto, Scarborough, Brampton, and the wider GTA. An early look typically costs far less than a late one.
Have your situation and your deadline reviewed
A contractor dispute is usually decided on the record. An early look at your documents and your limitation date typically costs far less than a late one.
Contact Nihang Law
About the author
Qasim Ali
Principal Lawyer · Nihang Law Professional Corporation · Toronto & Scarborough, Ontario · Law Society of Ontario
Qasim Ali is the Principal Lawyer at Nihang Law Professional Corporation, serving clients across Toronto, Scarborough, and the broader Greater Toronto Area. He provides full-service legal representation across immigration, real estate, family law, civil litigation, employment law, wills and estates, and business law.
Nihang Law is particularly recognized for its depth in immigration and real estate law, a combination that serves newcomers and growing families navigating both legal systems at once.
Learn more about Qasim Ali →Sources & References
- Consumer Protection Act, 2002, S.O. 2002, c. 30, Sch. A — Ontario e-Laws
- Limitations Act, 2002, S.O. 2002, c. 24, Sch. B — Ontario e-Laws
- Construction Act, R.S.O. 1990, c. C.30 — Ontario e-Laws
- O. Reg. 626/00, Small Claims Court Jurisdiction and Appeal Limit, as amended by O. Reg. 42/25 — Ontario e-Laws
- Courts of Justice Act, R.S.O. 1990, c. C.43 — Ontario e-Laws
- Government of Ontario — Your rights when starting home renovations or repairs
- Government of Ontario — Filing a consumer complaint
- Government of Ontario — Suing someone in Small Claims Court
- Government of Ontario — Guide for home renovation and roofing businesses
- Electrical Safety Authority — licensed contractor search
- Law Society of Ontario — Find a lawyer or paralegal
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