Common-Law Relationships in Ontario: Your Real Property Rights

Many Ontarians assume that living together long enough gives you the same legal standing as a married couple. In most provinces, that assumption is understandable — but in Ontario, it can lead to a painful surprise when a relationship ends. Common law property rights in Ontario are governed by very different rules than those that apply to married spouses, and understanding them early can protect you significantly.

This article explains what rights you do — and do not — have when a common-law relationship ends, and what legal tools exist when one partner contributed to property that ends up in the other's name.

What "Common-Law" Actually Means in Ontario

Ontario law does not use a single, uniform definition of "common-law partner." Different statutes use different thresholds. Under the Family Law Act, unmarried partners who have lived together continuously for at least three years, or who have a child together and have lived in a relationship of some permanence, may be entitled to spousal support. However, for property division purposes, those same partners are treated very differently than married spouses.

The key takeaway: being in a common-law relationship does not give you automatic rights to equalize the value of your partner's property.

The Equalization Scheme — And Why It Doesn't Apply to You

When a marriage breaks down, Ontario's Family Law Act provides a process called equalization of net family property. Each spouse calculates their net worth at the date of separation, subtracts their net worth at the date of marriage, and the spouse with the higher gain shares half the difference with the other. It is designed to recognize each spouse's contribution to the partnership.

Common-law partners have no access to this equalization scheme. If your partner accumulated significant assets during your relationship — a home, investments, a business — and title is in their name alone, the Family Law Act's property division rules simply do not apply to you.

This can be deeply unfair in practice. Many common-law couples blend their finances just as thoroughly as married ones, raise children together, and make career sacrifices that benefit their partner's financial growth.

Constructive Trust: The Main Tool for Common-Law Partners

Because equalization is off the table, common-law partners who seek a share of property must rely on equitable doctrines from the law of unjust enrichment, most importantly the concept of a constructive trust.

How Unjust Enrichment Works

A claim for unjust enrichment requires you to show three things:

1. Your partner was enriched — they received a benefit (for example, you paid down their mortgage, renovated their home, or ran the household so they could build a business).
2. You suffered a corresponding deprivation — you gave up something of value.
3. There is no juristic reason for the enrichment — no contract, gift, or legal rule that justifies your partner keeping all of it.

If those three elements are met, a court can impose a constructive trust, which essentially treats you as a beneficial owner of a share of the property — even if your name is not on the title. The size of the share will reflect your contribution.

What Counts as a Contribution?

Courts look at both financial and non-financial contributions. Direct financial contributions (making mortgage payments, funding renovations, covering household bills that freed up your partner's income) are the clearest. But unpaid domestic labour and childcare can also ground an unjust enrichment claim, particularly where those contributions allowed the other partner to accumulate wealth they would not otherwise have built.

Quantum Meruit

In some cases where a constructive trust in property is not the right remedy, a court may instead award a monetary sum — a payment reflecting the value of your contribution. This is sometimes called a quantum meruit award (Latin for "as much as was deserved") and operates like a debt owed to you rather than a share of a specific asset.

The Matrimonial Home: One Exception to Watch

Married spouses have special statutory rights over the matrimonial home — including equal rights of possession and a restriction on selling or mortgaging without both spouses' consent. Common-law partners do not have these protections. If you are not on title and your partner decides to sell or refinance the home you share, you have no automatic right to stop them. This is one of the starkest differences between married and common-law status in Ontario.

Spousal Support Can Still Apply

Even though property equalization is unavailable, common-law partners who meet the cohabitation thresholds in the Family Law Act may be entitled to spousal support. Entitlement is based on compensatory grounds (did the relationship disadvantage you economically — for example, did you leave the workforce to raise children?) or needs-based grounds (do you have a genuine financial need and does your partner have the ability to pay?).

The Spousal Support Advisory Guidelines — which courts use as a reference tool, though they are not binding law — provide ranges for the amount and duration of support based on the length of the relationship and the income gap between partners. The longer the relationship and the greater the economic disparity, the stronger the claim tends to be.

Protecting Yourself During the Relationship

The most reliable way to protect your interests in a common-law relationship is to address things proactively:

• Cohabitation agreement: A written contract between common-law partners that sets out how property will be treated if the relationship ends. Unlike the default rules, a cohabitation agreement can give you equalization-style rights — or define exactly how property is to be divided.
• Get on title: If you are contributing to a property, discuss being registered as a co-owner at the outset.
• Keep records: If things go sideways, your ability to document contributions (bank records, renovation invoices, shared bill payments) will matter enormously.

Frequently asked questions