Real estate is often the biggest financial asset a couple shares. It’s also one of the most misunderstood areas of Ontario family law. If you think that because you paid for the house, you’ll keep the house in a divorce, you may be in for a painful — and expensive — surprise.
Ontario’s rules around the matrimonial home are among the strictest in Canada, and they catch even financially savvy couples off guard. Here’s what you need to know — and how a prenup changes the equation.
The Matrimonial Home: Ontario’s Special Rules
Ontario treats the matrimonial home differently from every other asset. Under the Family Law Act, the matrimonial home is the property where the couple was living at the date of separation. And it comes with a unique set of rules that don’t apply to any other asset class.
First, the matrimonial home is not excluded from equalization — even if one spouse owned it before the marriage. This is a critical difference from other assets. If you owned a car worth $50,000 before your marriage, that value is deducted from the equalization calculation. But if you owned a home worth $500,000 before your marriage and it becomes the matrimonial home, you don’t get credit for that pre-marriage value. The full value at the date of separation is included in the equalization.
Second, both spouses have an equal right to live in the matrimonial home, regardless of whose name is on the title. You cannot sell, mortgage, or even rent out the matrimonial home without your spouse’s consent. This right exists independently of ownership.
These rules catch many couples off guard. For a broader look at what happens when couples don’t plan ahead, read The Cost of Not Having a Prenup: Real-Life Scenarios Ontario Couples Face.
Where a Prenup Makes a Difference
A marriage contract can override some of these default rules — and that’s exactly why real estate is one of the most common reasons couples seek prenups in Ontario.
You can agree that a home owned by one partner before the marriage will retain its pre-marriage value exclusion, even if it becomes the matrimonial home. You can define how a future real estate purchase will be divided. You can outline what happens if one partner contributes a larger down payment, or if one partner’s parents help fund the purchase. You can specify how equity will be split if the home appreciates significantly during the marriage.
What you cannot do in a prenup is determine who gets to live in the home during a separation. That’s a right reserved by law and cannot be contracted out. But you can address the financial side comprehensively: who keeps the equity, how it’s divided, and under what terms.
Common Real Estate Scenarios That Need a Prenup
Consider these situations, all of which are extremely common in Ontario:
One partner owns a condo before the marriage. The couple moves in together and it becomes the matrimonial home. Without a prenup, the entire value at separation is subject to equalization — even though one partner paid for it entirely.
One partner’s parents gift $200,000 for a down payment. Without a contract specifying this contribution, it could be treated as a gift to both partners and divided equally.
The couple buys a home together but contributes unequal amounts. Without an agreement defining each partner’s share, the default equalization rules apply regardless of who put in more.
The couple owns multiple properties. While the matrimonial home rules apply to the home ordinarily occupied at separation, more than one property — such as a house and a cottage — can qualify as a matrimonial home. Determining which properties meet that definition can quickly become a complex and expensive legal dispute.
Cottages, Investment Properties, and Family Homes
Many Ontario families have cottages that have been passed down through generations. Without a marriage contract, these properties can become part of the equalization process — and in some cases, more than one property (such as a primary residence and a cottage) may be treated as matrimonial homes. If a cottage or other property has appreciated significantly over time, the financial exposure can be substantial. A marriage contract can explicitly exclude family cottages, investment properties, and rental income from equalization, helping ensure that generational assets remain in the family. For more on protecting family assets, read How Prenups Protect Family Businesses, Cottages, and Generational Wealth.
The Takeaway
Ontario’s real estate rules are designed to be fair, but “fair” under the law may not match what you and your partner would consider fair. A marriage contract lets you write your own rules — rules that reflect your actual contributions, intentions, and values. Given that real estate is likely your largest asset, protecting it properly isn’t optional. It’s essential. For context on how these rules compare in other provinces, see Prenups Across Canada: How the Rules Change Province by Province.
Protect your real estate interests with a marriage contract. Start at I Do Prenup.
Frequently Asked Questions
Q: Can I protect a home I owned before marriage with a prenup?
Yes. A marriage contract can specify that the pre-marriage value of a home you owned is excluded from equalization, even if it becomes the matrimonial home.
Q: What if my parents helped with the down payment?
A prenup can document parental contributions and specify how they’re treated in equalization. Without a contract, the contribution could be considered a gift to both spouses.
Q: Can a prenup say who gets to live in the house after separation?
No. Under Ontario’s Family Law Act, both spouses have a right to possession of the matrimonial home regardless of ownership. A prenup cannot override this right.
Q: What about investment properties or rental units?
Investment properties are treated as regular assets and can be fully addressed in a prenup, including how rental income and appreciation are handled during the marriage.