Insights Hub
Contract Disputes in Ontario
What happens when an agreement isn't honoured — breach, demand letters, damages, remedies, and the paths Ontario parties use to resolve a dispute.
A contract dispute usually starts the same way: one side believes the other didn't do what they promised. From there, the path forward depends on what was agreed, what evidence exists, and how much is at stake.
This hub walks through the practical side of an Ontario contract dispute — from recognizing a breach, to putting a demand in writing, to understanding what a court can and can't award, to the different ways a dispute can actually get resolved.
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More guides in this hub
Demand Letters in Ontario Contract Disputes: What They Should Include
How a well-written demand letter is structured, what it should say, and why it's often the most useful first step in a dispute.
How Long Do You Have to Sue for Breach of Contract in Ontario?
A plain-English walkthrough of Ontario's general limitation period for contract claims, and the exceptions worth knowing about.
Mediation vs. Arbitration in Ontario: Which Dispute Resolution Option Fits?
Compares how mediation and arbitration actually work in Ontario — voluntary vs. binding, cost, speed, confidentiality, and enforceability — and when a contract requires one or the other.
Taking a Contract Dispute to Small Claims Court in Ontario
A step-by-step walkthrough of pursuing a contract claim in Ontario’s Small Claims Court — the $35,000 limit, filing, costs, evidence, settlement conferences, trial, and appeals.
Contract Damages in Ontario: How Compensation Is Calculated
How Ontario courts calculate contract damages — expectation, reliance, and consequential losses, the duty to mitigate, liquidated damages clauses, and the rare role of punitive damages.
Are Verbal Agreements Enforceable in Ontario?
Why verbal agreements are generally enforceable in Ontario, the Statute of Frauds exceptions that require writing, and the practical evidence and risks that come with an unwritten deal.
How to Terminate a Contract in Ontario Without Breaching It
Explains the lawful ways a contract can be ended in Ontario — termination clauses, notice, for-convenience vs. for-cause, mutual release, and frustration — and how getting the mechanics wrong turns a termination into a breach.
Force Majeure Clauses in Ontario: When Performance Is Excused
Covers what force majeure clauses typically excuse, why Ontario courts read them narrowly, how the doctrine differs from common-law frustration, and the notice obligations these clauses usually impose.
Void vs. Voidable Contracts in Ontario: What’s the Difference?
Breaks down the difference between a contract that never legally existed and one that stays binding until the wronged party elects to cancel it, including grounds like illegality, misrepresentation, duress, undue influence, and unconscionability.
Breach of Warranty Claims in Ontario
Explains express vs. implied warranties and how breaching a warranty (damages only) differs from breaching a condition (can end the contract), with common disputes in vehicle, home, and service purchases.
Anticipatory Breach of Contract in Ontario
Covers how a clear advance signal of non-performance (repudiation) lets the innocent party treat the contract as immediately breached or affirm it and wait, plus the risks of each choice.
Specific Performance as a Contract Remedy in Ontario
Explains this discretionary equitable remedy forcing actual performance (mainly real estate/unique goods) rather than damages, and the defences available against it.
Unjust Enrichment Claims in Ontario
Covers the three-part test (enrichment, corresponding deprivation, no juristic reason), how it differs from breach of contract, and common scenarios like undocumented work and property contribution disputes.
How Ontario Courts Interpret Ambiguous Contract Terms
Explains the modern Sattva Capital factual-matrix approach, contra proferentem, the parol evidence rule, and why clear drafting avoids these disputes.
The Duty of Good Faith in Ontario Contracts
Explains Bhasin v. Hrynew’s organizing principle of good faith and the narrower duty of honest performance it created, what that duty does and doesn’t require, and how it surfaces in termination and discretion disputes.
Entire Agreement Clauses in Ontario Contracts
Explains what an entire agreement clause excludes from a contract, why it’s used to prevent disputes over prior promises, and its limits — including fraudulent misrepresentation claims.
Indemnification Clauses in Ontario Contracts Explained
Covers what an indemnity clause shifts onto the indemnifying party, how it differs from a limitation of liability clause, mutual vs. one-sided indemnities, and common carve-outs and caps.
Liquidated Damages vs. Penalty Clauses in Ontario
Explains why a genuine pre-estimate of loss is generally enforceable while a punitive penalty clause is not, how courts tell the two apart, and drafting tips to favour enforceability.
Settling a Contract Dispute in Ontario: Settlement Agreements and Releases
Walks through how Ontario contract disputes typically settle, what a settlement agreement and release usually contains, and how minutes of settlement work at a court settlement conference.
Related Tools
Practical tools for this topic
Breach of contract next-steps wizard
A step-by-step way to think through what may have happened and what comes next.
Limitation-period guide
A plain-English walkthrough of Ontario's general time limits for contract claims.
Demand-letter checklist
The core elements a demand letter typically needs to be taken seriously.
Evidence checklist for a contract dispute
What to gather and preserve as soon as a disagreement becomes likely.
FAQ
Contract Disputes: frequently asked questions
What is the first thing I should do if I think a contract was breached?
Start by re-reading the agreement and gathering anything relevant — messages, invoices, photos, payment records. Understanding exactly what was promised and what evidence you have shapes every decision that follows.
Do I need to send a demand letter before suing?
It isn't always a legal requirement, but a clear written demand often resolves a dispute without going further, and it creates a record showing you gave the other side a chance to fix the problem.
Is mediation faster than going to court?
Mediation is often faster and less costly than litigation, since it doesn't follow a court's schedule and aims to reach an agreement rather than a ruling. It isn't right for every dispute, though.
What if the other side ignores my demand letter?
Common next steps include proposing mediation, filing a Small Claims Court claim for smaller amounts, or starting a Superior Court action for larger or more complex claims.
Understand your agreement. Know your next step.
Ontario-wide, plain-English contract law information — built to help you make sense of your situation before you decide what to do next.