Litigating an unjust enrichment claim for a common-law partner in Ontario is incredibly complex, often costing between $30,000 and $100,000+ CAD if the matter goes to a full trial. Because common-law partners do not have automatic property rights, proving your contribution requires forensic accounting, dozens of affidavits, and extensive litigation at the Superior Court of Justice.
Unlike legally married couples, common-law partners in Ontario do not automatically split the value of their property when they separate. If you lived with your partner in Toronto, Hamilton, or London for a decade, raised children together, and helped renovate a house that is solely in their name, you might walk away with nothing under standard property laws. 💔 To fix this severe financial imbalance, common-law partners must turn to a legal concept called “unjust enrichment.”
As of May 2026, successfully proving unjust enrichment means showing that your ex-partner financially benefited from your direct contributions (like paying half the mortgage or providing years of unpaid labour) without legally compensating you. While this claim can result in a massive financial payout or a “constructive trust” over the home, it is one of the most difficult and expensive battles to fight in family court. This guide outlines the step-by-step process of an unjust enrichment claim and the steep costs associated with litigating it in Ontario.
Step-by-Step Process for an Unjust Enrichment Claim
You cannot simply tell a judge that the situation is unfair. You must prove the flow of money and labour with hard evidence. Working with an experienced family law firm is mandatory. 📝
Step 1: Identifying the Three Legal Pillars
Before filing a lawsuit, your lawyer will assess if your case meets the strict legal test set out by the Supreme Court of Canada. You must prove three things: an enrichment (your ex got wealthier), a corresponding deprivation (you lost money or time), and the absence of a juristic reason (there was no contract or legal obligation for you to give them that money or labour free of charge).
Step 2: Gathering Forensic Financial Evidence
This step is where the costs begin to skyrocket. You must gather years of banking records, renovation receipts, and text messages. Often, your lawyer will need to retain a forensic accountant to trace exactly how your paycheques were used to increase the value of your ex-partner’s assets over the course of the relationship.
Step 3: Filing the Application
Your lawyer will draft and file a formal Application at the Superior Court of Justice. The claim will formally ask the judge for either a monetary award (a lump sum of cash to repay you) or a constructive trust (a court order granting you a percentage of ownership in the actual property, like the family home).
Step 4: The Discovery Process
Because these cases rely heavily on financial history, you will go through a lengthy “Examinations for Discovery” phase. 🕵 This is a formal, out-of-court interrogation where the opposing lawyer will question you under oath about every financial decision you made during the relationship. This process requires extensive preparation and generates massive legal bills.
Step 5: Attending Settlement Conferences
Ontario family courts mandate that parties attempt to settle before reaching trial. You will attend Case Conferences and Settlement Conferences with a judge who will give you an honest opinion on your chances of winning. Many unjust enrichment cases are resolved here, as the risk and cost of a full trial become a stark reality to both sides.
Step 6: Proceeding to a Full Trial
If your ex-partner refuses to settle, the case will proceed to a full trial. Your lawyers will present financial experts, call witnesses to testify about your domestic labour, and argue complex case law. Trials can last anywhere from a few days to several weeks, draining tens of thousands of dollars.
How Much Does it Cost in Ontario?
Litigating unjust enrichment is notoriously expensive due to the burden of proof required. Below is a breakdown of typical estimated costs in CAD for a complex common-law property dispute.
| Litigation Phase / Service | Average Estimated Cost (CAD) |
|---|---|
| Initial Application & Filing Fees | $3,000 – $6,000 |
| Forensic Accountant / Valuation Expert | $5,000 – $15,000+ |
| Examinations for Discovery | $7,000 – $15,000 |
| Mediation / Settlement Conferences | $4,000 – $10,000 |
| Full Trial (Lawyer Prep & Attendance) | $30,000 – $100,000+ |
It is important to understand that in Ontario, the “loser pays” principle applies. If you win, the judge may order your ex-partner to reimburse a significant portion of your legal costs. However, if you lose, you could be ordered to pay theirs. 💰
How Long Does the Process Take?
Because common-law property disputes require digging through years of financial history, they move slowly. Gathering the initial evidence and filing the claim takes 2 to 4 months. The discovery and mediation phases usually consume 1 to 2 years. If the case cannot be settled and must go to a full trial at the Superior Court, you should expect the entire process to take 2 to 4 years from start to finish.
Frequently Asked Questions (FAQ)
What is a constructive trust?
A constructive trust is a legal remedy where a judge rules that, although your ex-partner’s name is the only one on the property deed, they hold a percentage of that property “in trust” for you because of your significant contributions to it.
Does unpaid domestic work count as a contribution?
Yes. Ontario courts recognize that unpaid domestic labour, such as raising children, cooking, and cleaning, frees up the other partner to earn money and acquire assets. This labour can absolutely form the basis of an unjust enrichment claim.
Can I claim spousal support and unjust enrichment?
Yes. Spousal support is based on a difference in income and standard of living, while unjust enrichment is about dividing wealth and property. You can apply for both simultaneously in your family court application.
Do I need receipts for everything I bought?
While receipts are incredibly helpful, courts understand that people in relationships do not keep perfect records. Bank statements, credit card logs, and witness testimony can also be used to prove you contributed financially to the household.
Is unjust enrichment the same as a Joint Family Venture?
They are related. A Joint Family Venture (JFV) is a broader way to prove unjust enrichment by showing the couple operated as a unified economic team, rather than requiring a strict dollar-for-dollar calculation of who paid for what.
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