In Ontario, common-law partners do not automatically split property. If a home is solely in your partner’s name, you must prove “unjust enrichment” through financial contributions or free labour (a joint family venture) to claim a constructive trust and secure your share of the equity.
Living together for years, sharing expenses, and building a life feels exactly like a marriage. 🏘️ However, when an unmarried relationship breaks down in Ontario, the financial shock can be devastating. Unlike legally married couples, common-law spouses do not have an automatic statutory right to divide the value of the family home or equalize their Net Family Property under the Family Law Act. If your name is not on the deed to the house, you technically own nothing of it.
To fix this legal unfairness, the Superior Court of Justice relies on a complex area of common law known as “unjust enrichment.” If you spent years renovating a house, paying the mortgage, or raising children so your partner could build their business, you may be entitled to a “constructive trust.” This is a court order declaring that you rightfully own a percentage of the property, preventing your ex-partner from walking away with all the wealth you helped create.
Step-by-Step Process for Claiming a Constructive Trust in Ontario
Proving a constructive trust is one of the most difficult and evidence-heavy processes in family litigation. 📈 It requires showing a judge exactly how your labour or money directly increased the value of your ex-partner’s assets. Here is the typical legal roadmap your law firm will follow.
Step 1: Establishing the Common-Law Relationship
First, you must prove you were actually in a marriage-like relationship. In Ontario, this generally means living together continuously for at least three years, or living together in a relationship of some permanence if you share a child. Your lawyer will use joint tax returns, shared utility bills, and witness affidavits to prove the economic and emotional integration of your lives.
Step 2: Proving Unjust Enrichment
This is the core of your legal argument. 💵 You must prove three things: 1) You provided a benefit to your partner (e.g., paying half the mortgage or doing $50,000 worth of free carpentry on their house); 2) You suffered a corresponding deprivation (you lost your own money or time); and 3) There was no legal reason for this to happen (it was not a formal gift or a business contract).
Step 3: Proving a Joint Family Venture
To get a significant share of the property, your lawyer will try to prove your relationship was a “Joint Family Venture.” This means you and your partner pooled your resources, planned for the future together, and prioritized the family unit over individual wealth. If the judge agrees, they will view the wealth accumulated during the relationship as a joint effort, regardless of whose name is on the bank account.
Step 4: Filing an Application in Superior Court
Because constructive trust claims involve property rights and complex equity law, they must be litigated in the Superior Court of Justice. 👨⚖️ Your lawyer will file a formal Application seeking a “declaration of constructive trust” or, alternatively, a monetary award for damages. If successful, the judge can order your ex-partner to pay you a massive lump sum or force the sale of the home so you can receive your percentage of the equity.
How Much Does it Cost in Ontario?
Constructive trust claims are notoriously expensive. Because there is no simple mathematical formula like there is for married couples, these cases often require extensive forensic accounting and proceed all the way to a full trial. Here are the estimated costs as of May 2026 in CAD.
- Initial Retainer & Discovery: To gather evidence and file the initial pleadings, expect to pay a retainer of $5,000 to $10,000 CAD.
- Forensic Accounting / Appraisal: You may need experts to value the property or quantify the exact financial value of your unpaid labour, costing $3,000 to $7,500.
- Full Trial Representation: If your ex-partner refuses to settle and fights the claim in court, legal fees for a multi-day trial can easily skyrocket to $30,000 to $80,000+ CAD per spouse.
| Legal Service / Phase | Estimated Cost in Ontario (CAD) |
|---|---|
| Initial Pleadings & Retainer | $5,000 – $10,000 |
| Expert Appraisals / Tracing | $3,000 – $7,500 |
| Full Contested Trial | $30,000 – $80,000+ |
How Long Does the Process Take?
Due to the complexity of the evidence required, a constructive trust claim is rarely resolved quickly. ⏱️ Gathering years of bank statements, renovation receipts, and text messages can take your legal team 3 to 6 months to compile into a strong brief.
If the case goes into active litigation at the Superior Court of Justice, you are at the mercy of the judicial backlog. It is very common for a contested unjust enrichment case in busy jurisdictions like Brampton, Hamilton, or Ottawa to take 1.5 to 3 years to reach a final trial decision. Settling through private mediation is highly recommended to save time.
Frequently Asked Questions (FAQ)
Does living together for 3 years give me half the house?
No. In Ontario, living together for three years gives you the right to claim spousal support, but it never automatically grants you property rights. To get a share of the house, you must actively prove a constructive trust claim in court.
What if I only paid for groceries while they paid the mortgage?
You can still make a claim. The courts recognize that by paying for groceries and daily living expenses, you freed up your partner’s income, allowing them to pay down the mortgage. This indirect contribution is a common foundation for a Joint Family Venture argument.
Can I force my ex to sell the house?
If a judge grants you a constructive trust, they declare that you hold an equitable interest in the property. To satisfy your payout, the judge can order the home to be sold, or give your ex-partner a set timeframe to refinance the mortgage and buy you out.
How can I protect myself before moving in?
The safest way to avoid a massive legal battle is to sign a Cohabitation Agreement before you move in together. This legal contract clearly outlines who owns what and waives the right to claim unjust enrichment if the relationship ends.
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