To defeat an unjust enrichment claim in Ontario, you must prove a “juristic reason” for the financial imbalance, such as showing your ex-partner lived rent-free in your home. Defending against these complex trust claims at the Superior Court of Justice generally requires a law firm, with trial costs often exceeding $30,000 CAD.
When a common-law relationship breaks down in Ontario, the partner whose name is on the property deed often breathes a sigh of relief, assuming their assets are fully protected. Because unmarried couples do not automatically split property under the Family Law Act, many property owners believe their ex has no legal right to their home. However, this false sense of security is shattered when they are served with a lawsuit claiming “unjust enrichment” and seeking a constructive trust over their real estate.
Defending against an unjust enrichment claim requires a highly strategic approach. 📋 Your ex is essentially arguing that they contributed so much time, labour, or money to your property that it would be legally unfair for you to keep all the equity. To protect your home in Toronto, Mississauga, or anywhere in the province, you must work with a family lawyer to prove that your ex was already fairly compensated for their contributions during the relationship.
Step-by-Step Process in Ontario
When you are served with a Form 8 Application at the Superior Court of Justice, you only have 30 days to file a formal defence. Here is how property owners typically structure their legal defence against an unjust enrichment lawsuit.
Step 1: Reviewing the Claim and Gathering Evidence
The first step is meticulously reviewing exactly what your ex is claiming. 📖 Are they claiming they paid for the roof repair? Are they claiming they sacrificed their career to raise your children? You must gather bank statements, old emails, and receipts to challenge their narrative. If they claim they paid the mortgage, but your bank records show the money came entirely from your sole account, this evidence is critical.
Step 2: Establishing a Juristic Reason
This is the most powerful defence in Ontario family law. A “juristic reason” is a legally acceptable explanation for why your ex contributed money or labour without acquiring an ownership interest. The most common defence is “set-off.” You argue that while your ex bought groceries or occasionally painted a room, they were provided with free room and board for years. The benefit of living rent-free legally cancels out the value of their minor contributions.
Step 3: Challenging the “Joint Family Venture”
Your ex may try to prove you operated as a single economic unit, known as a joint family venture. 👨💼 To defend against this, your lawyer will highlight evidence of financial separation. Did you keep separate bank accounts? Did you file your taxes separately? Did you explicitly refuse to put their name on the mortgage? Proving that you intentionally kept your finances independent is vital to defeating this argument.
Step 4: Filing a Form 10 Answer
You must formally respond to the court. 💰 Your law firm will draft and file a Form 10 Answer, aggressively denying the trust claim. You will also need to submit a sworn Form 13 or 13.1 Financial Statement, providing the court with a completely transparent view of your current assets, debts, and income.
Step 5: Attending Mandatory Case Conferences and Mediation
Ontario courts mandate that parties attempt to settle before trial. You will attend a Case Conference where a judge will give initial feedback. Often, even if you have a strong defence, your lawyer may recommend offering a small, “nuisance value” monetary settlement to make the lawsuit go away, as fighting a full trial can be financially ruinous.
How Much Does it Cost in Ontario?
Defending a property claim is just as expensive as launching one. 💵 Because your house is on the line, investing in a robust legal defence is usually non-negotiable.
| Court Filing Fee (Form 10 Answer) | $171 |
| Lawyer Retainer (Drafting Answer) | $3,500 – $7,500+ |
| Private Mediation Services | $1,500 – $4,000 (Split between parties) |
| Full Trial Defence | $30,000 – $75,000+ |
How Long Does the Process Take?
Litigation over real estate in family court is notoriously slow. From the moment you file your Answer, you can expect the process to take 1.5 to 3 years to reach a final trial decision. ⏳ Delays in the Superior Court of Justice mean that your property might be tied up in litigation for years, which can prevent you from selling or refinancing the home until the matter is resolved.
Frequently Asked Questions (FAQ)
Can I just kick my common-law partner out?
If their name is not on the title and you are not legally married, they do not have a statutory right to stay. However, you should give reasonable written notice before changing the locks to avoid emergency court injunctions.
What if they put their inheritance into my house?
If your ex made a massive, direct financial contribution like paying $50,000 for an addition using their inheritance, they have a very strong unjust enrichment claim. You will likely owe them that money back.
Can they freeze my ability to sell the house?
Yes. They can apply to the court for a Certificate of Pending Litigation (CPL). If granted and registered on your title, it warns buyers of the lawsuit, effectively preventing you from selling the property.
Does a Cohabitation Agreement prevent this?
Absolutely. A properly drafted Cohabitation Agreement is the absolute best defence against an unjust enrichment claim, as it clearly outlines that neither party will claim property rights upon separation.
Can I be forced to pay spousal support too?
Yes. If you lived together for 3 years (or have a child together), your ex may be entitled to spousal support, which is evaluated entirely separately from who owns the physical property.
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