Common-Law Partners and the Home in Ontario: What the Law Actually Says

Many couples in Ontario live together for years — sharing a mortgage, splitting groceries, raising children — and assume they have roughly the same legal protections as married spouses. When a relationship ends, that assumption can cause real harm. Common-law partner home rights in Ontario are fundamentally different from the rights married spouses hold, and the gap is widest when it comes to the family home.

This article explains the difference plainly, walks through the rights common-law partners do have, and shows how a cohabitation agreement can close the gap before a crisis arrives.

The Married-Spouse Baseline: What Common-Law Partners Do Not Get

To understand what common-law partners lose, it helps to see what the Ontario Family Law Act gives married spouses.

The Matrimonial Home Is Special for Married Couples

Under Part II of the Family Law Act, the home where a married couple ordinarily resides is the "matrimonial home." That designation carries powerful protections:

• Equal right of possession. Both spouses have an equal right to live in the matrimonial home, regardless of whose name is on title.
• No sale or mortgage without consent. A spouse who owns the home cannot sell it, mortgage it, or transfer it without the other spouse's written consent — even if that other spouse is not on title.
• Equalization of net family property. On separation, married spouses equalize the value of property accumulated during the marriage, and the matrimonial home is factored into that calculation with no deduction for its value at the start of the marriage.

These protections exist automatically, the moment a couple marries and moves into a home together.

Common-Law Partners Are Explicitly Left Out

Part II of the Family Law Act does not apply to common-law partners. Full stop. No equal right of possession. No consent requirement before a sale. No automatic equalization of property.

If your partner owns the home in their name alone, they can sell it, refinance it, or ask you to leave — without your consent and without any statutory obligation to share the proceeds. This is not a loophole or an oversight. It is the deliberate structure of Ontario property law as it applies to unmarried couples.

What Rights Do Common-Law Partners Actually Have?

The picture is not entirely bleak. Courts have developed doctrines — grounded in the law of equity — that can give a non-titled partner a share of the home when it would be unfair to ignore their contributions. But these rights are not automatic. They must be claimed, proved, and litigated.

Unjust Enrichment

The most commonly used remedy is unjust enrichment. A court can find that the titled partner has been unjustly enriched if:

1. The titled partner received a benefit (for example, the home appreciated in value while the other partner's contributions freed up money to pay the mortgage).
2. The non-titled partner suffered a corresponding deprivation.
3. There is no "juristic reason" — no contract, gift, or legal rule — that justifies keeping the benefit.

If all three elements are proved, the court can award a money judgment or a share of the property itself.

Resulting Trust

A resulting trust may arise when one partner contributes to the purchase price of a home but title is taken in the other partner's name alone. The law presumes that the titled partner holds a share of the home on trust for the contributing partner, proportional to their contribution. The burden then shifts to the titled partner to rebut that presumption.

Resulting trust claims tend to be clearest when a direct financial contribution — a down-payment transfer, for example — can be traced. They are harder to sustain on the basis of indirect contributions like homemaking or child-rearing.

Constructive Trust

Where unjust enrichment is established and a money award would be insufficient or inadequate, a court may impose a constructive trust — treating the titled partner as holding a portion of the property on trust for the other. The size of the share reflects the non-titled partner's contribution to the acquisition, preservation, or improvement of the home.

Constructive trust is a powerful remedy, but it is also expensive and uncertain to pursue. Winning requires gathering evidence of contributions over potentially many years, surviving credibility assessments, and often enduring a lengthy trial.

The Practical Risk for the Non-Titled Partner

Here is the scenario that plays out in family law files more often than it should:

• Couple lives together for eight years. They regard the home as "theirs."
• One partner's name is on title; the other's is not.
• Relationship breaks down. The titled partner demands the other leave.
• The non-titled partner has no automatic right to stay and no automatic share of the home's value.
• To recover anything, the non-titled partner must bring an unjust enrichment or trust claim — a court process that can take years and cost tens of thousands of dollars, with no guaranteed outcome.

This risk is especially acute for partners who left the workforce to care for children, who made indirect financial contributions (paying household bills so the other partner could pay the mortgage), or who contributed labour to renovations and improvements.

The Solution: A Cohabitation Agreement

Ontario's Family Law Act permits unmarried couples to enter into cohabitation agreements that govern their property rights during and after the relationship. A well-drafted cohabitation agreement can:

• State explicitly what share of the home each partner owns.
• Require consent before a sale or refinancing.
• Set out what happens to the home and its equity on separation.
• Mirror matrimonial home protections that the Act does not otherwise provide.
• Address support obligations if the relationship ends.

For a cohabitation agreement to be enforceable, both parties must sign it voluntarily, receive independent legal advice, and make full financial disclosure. Rushing one partner into signing without advice is grounds to set the agreement aside later.

The best time to sign a cohabitation agreement is before moving in together — or as soon as possible after. Courts can and do enforce agreements signed during a relationship, but the longer the delay, the harder it may be to establish that both parties signed freely.

Frequently asked questions