Cohabitation Agreement and the Matrimonial Home – What the Law Says in Ontario
                     Cohabitation Agreement and the 
Matrimonial Home – What the Law 
Says in Ontario
BTL Law Firm
November, 2025
SparationAgreementOntario.ca Page 1
Contents
Understanding the Concept of the Matrimonial Home in Ontario ......................................................................... 3
Definition Under Ontario’s Family Law Act .................................................................................................... 3
Special Legal Protections for Married Couples................................................................................................. 3
Why These Rights Do Not Automatically Apply to Common-Law Partners ..................................................... 4
Shared Residence for Common-Law Couples....................................................................................................... 
4
Legal Status of a Home When Partners Live Together but Are Not Married ..................................................... 4
How Ownership (Title and Mortgage) Determines Rights ................................................................................ 5
Why a Cohabitation Agreement Is Essential to Clarify Expectations ................................................................ 5
How a Cohabitation Agreement Can Address Housing 
Rights .............................................................................. 6
Setting Out Who Owns or Contributes to the Property ..................................................................................... 6
Deciding What Happens if the Relationship Ends............................................................................................. 6
Protecting One Partner’s Pre-Owned Home from Automatic Claims ................................................................ 7
Including Buyout or Sale Provisions for Clarity ............................................................................................... 7
Key Differences Between Matrimonial Homes and Shared Residences ................................................................ 
7
Married Couples: Automatic Equal Rights ....................................................................................................... 8
Common-Law Couples: No Automatic Property Rights Without an Agreement ............................................... 8
How Ontario Courts Treat Financial Contributions (Constructive Trust Claims) .............................................. 8
Recent Ontario Court Cases on Homes and Cohabitation...................................................................................... 
9
Examples Where Common-Law Partners Successfully Claimed Interest in a Shared Residence ....................... 9
Cases Where Lack of an Agreement Led to Disputes ..................................................................................... 10
How Courts Balance Fairness with Legal Ownership ..................................................................................... 10
Practical Steps for Protecting Property in a Common-Law Relationship ............................................................. 
10
Discuss Property Ownership Before Moving In.............................................................................................. 11
Draft a Cohabitation Agreement With Full Financial Disclosure .................................................................... 11
Obtain Independent Legal Advice for Enforceability...................................................................................... 11
Review and Update the Agreement if the Living Situation Changes ............................................................... 11
Why Legal Advice Matters in Ontario ................................................................................................................ 
12
How Family Lawyers Explain Differences between Married and Common-Law Rights ................................. 12
Preventing Costly Litigation through Clear Agreements ................................................................................. 12
Ensuring Peace of Mind with a Legally Binding Plan ..................................................................................... 12
Contact us today!..................................................................................................................................  
13
Understanding the Concept of the Matrimonial Home in Ontario
In Ontario, the concept of the matrimonial home carries significant 
legal weight under the Family Law Act. It refers to the home that a 
legally married couple ordinarily occupies as their family residence at 
the time of separation. Unlike other assets, the matrimonial home is 
treated with special protections to ensure fairness and stability during the 
breakdown of a marriage.
Definition Under Ontario’s Family Law Act
Section 18 of the Family Law Act defines the matrimonial home as any 
property—whether owned or leased—where the spouses were living 
together at the time of separation. This can include a house,
condominium, or even a rented apartment, provided it is the couple’s 
primary residence. Importantly, a couple can have more than one
matrimonial home if they regularly use more than one property (such as 
a family cottage).
Special Legal Protections for Married Couples
The matrimonial home is distinct because of the unique rights and 
protections it offers to married spouses, including:
 Equal right of possession: Both spouses have an equal legal right 
to live in the home, regardless of whose name is on the title or 
lease.
 Exclusive possession orders: A court may grant one spouse the 
right to live in the matrimonial home, especially in cases involving 
domestic conflict or where children’s best interests are at stake.
 Restriction on selling or mortgaging: The owner of the home 
cannot sell, mortgage, or transfer the property without the other 
spouse’s written consent.
These protections aim to prevent either spouse from being unfairly 
displaced during or after separation.
Why These Rights Do Not Automatically Apply to Common-Law 
Partners
Common-law partners—those who live together in a conjugal 
relationship for at least three years, or less if they share a child—do not 
benefit from the same legal protections regarding the matrimonial home. 
While common-law partners may have rights to share in property they 
jointly own, the Family Law Act’s matrimonial home provisions do 
not extend to them. This means:
 A common-law partner whose name is not on the title or lease may 
not have the right to remain in the home after separation.
 They do not automatically gain the equal right of possession that 
married spouses enjoy.
 Unless otherwise agreed upon, the property division rules for
common-law partners follow general property and trust law 
principles rather than the matrimonial home protections.
Because of this gap, many common-law couples choose to create a 
cohabitation agreement to clearly set out each partner’s rights and 
responsibilities regarding the home. This agreement can cover 
ownership, contributions to expenses, and what happens to the property 
in the event of a breakup.
Shared Residence for Common-Law Couples
When common-law partners live together in Ontario, the home they 
share is often referred to as a shared residence rather than a 
matrimonial home. While it may serve the same practical purpose as a 
family home, its legal status is very different under Ontario law 
because the special protections of the Family Law Act do not apply.
Legal Status of a Home When Partners Live Together but Are Not 
Married
Unlike married couples, common-law partners do not have automatic 
rights to stay in the home after separation. Even if both have lived there 
for years, the legal treatment of the property depends on ownership. A 
partner whose name is not on the title or lease typically does not have a 
legal claim to remain in the home unless they can prove a financial or 
legal interest through other means, such as contributions to mortgage 
payments, renovations, or a resulting trust claim.
How Ownership (Title and Mortgage) Determines Rights
The rights of common-law partners in Ontario are primarily dictated by 
ownership:
 If one partner holds title and the mortgage: That partner is 
legally recognized as the homeowner, and the other has no 
automatic property rights.
 If both names are on title and mortgage: Each partner has a legal 
share in the property, regardless of who paid more toward the 
purchase or upkeep.
 If only one partner is on title but the other contributed 
financially: The contributing partner may make a claim under 
equitable principles such as unjust enrichment, but these cases are 
complex and often require litigation to resolve.
Because of these ownership-based rules, common-law partners face 
uncertainty compared to married couples, particularly if the relationship 
ends.
Why a Cohabitation Agreement Is Essential to Clarify Expectations
To avoid disputes, many common-law couples in Ontario turn to a 
cohabitation agreement. This legally binding document allows partners 
to set out:
 Who owns the home and how ownership is shared.
 How mortgage payments, property taxes, and maintenance costs 
will be divided.
 What happens to the property if the relationship ends — including 
whether one partner has the right to buy out the other’s share or
whether the home must be sold.
By creating a clear roadmap, a cohabitation agreement reduces the risk 
of costly litigation and ensures that both partners understand their rights 
and obligations. It provides peace of mind that the shared residence will 
be dealt with fairly, in accordance with what both parties agreed to while 
the relationship was intact.
How a Cohabitation Agreement Can Address Housing Rights
One of the most important functions of a cohabitation agreement in
Ontario is clarifying each partner’s rights and obligations concerning the 
home. Because common-law couples do not receive the same 
protections as married spouses under the Family Law Act, a well-drafted 
agreement can prevent misunderstandings and disputes if the 
relationship ends.
Setting Out Who Owns or Contributes to the Property
The agreement can clearly identify who holds legal title to the 
property and whether ownership is joint or in one partner’s name. It can 
also set out how each partner will contribute to the mortgage, property 
taxes, insurance, utilities, and repairs. By documenting these 
arrangements, couples avoid disagreements about financial 
responsibility during the relationship.
Deciding What Happens if the Relationship Ends
A cohabitation agreement can outline in advance what will happen to the 
home if the relationship breaks down. For example, it can state whether:
 The property will be sold and proceeds divided according to 
ownership shares.
 One partner has the option to buy out the other’s interest.
 The partner who owns the home will retain possession, with the 
other agreeing to move out within a set timeframe.
Having these terms in writing avoids the uncertainty and expense of 
litigation.
Protecting One Partner’s Pre-Owned Home from Automatic 
Claims
If one partner owned the home prior to the relationship, they may wish 
to protect it from potential claims by their common-law partner. A 
cohabitation agreement can explicitly state that the property remains the 
sole asset of the original owner, regardless of the length of cohabitation. 
This is particularly valuable where the home was purchased long before 
the relationship, inherited from family, or contains significant pre- 
acquired equity.
Including Buyout or Sale Provisions for Clarity
To minimize conflict, many agreements include specific buyout or sale 
provisions. These might outline:
 How the buyout price will be calculated (e.g., independent 
appraisal, average of two valuations).
 The timeline within which the buyout must occur.
 The process for listing and selling the property if neither partner 
wishes to keep it.
Such provisions give both partners a clear, enforceable path forward, 
reducing the risk of prolonged disputes.
Key Differences Between Matrimonial Homes and Shared 
Residences
The distinction between a matrimonial home for married couples and a 
shared residence for common-law partners is one of the most 
significant differences in Ontario family law. Understanding these
differences helps couples recognize why legal agreements are essential, 
especially for those living together without marrying.
Married Couples: Automatic Equal Rights
Under Ontario’s Family Law Act, married spouses enjoy automatic 
equal rights to live in the matrimonial home, even if only one spouse 
legally owns it. This means that:
 Neither spouse can sell, transfer, or mortgage the home without the 
other’s written consent.
 Both spouses have the legal right to remain in the home after 
separation until a court decides otherwise.
 Courts can grant exclusive possession orders to one spouse, often 
to protect children’s stability or in cases involving family violence.
These automatic protections ensure that the matrimonial home is treated 
as a central family asset, regardless of ownership.
Common-Law Couples: No Automatic Property Rights Without an 
Agreement
For common-law couples in Ontario, the same rules do not apply. A 
shared residence is treated under general property law rather than family 
law. This means that:
 If one partner owns the home, the other has no automatic right to 
remain after separation.
 A non-owner may only have rights if their name is on the title or if 
they can prove a financial interest.
 Without a cohabitation agreement, common-law partners risk 
significant uncertainty over housing rights if the relationship ends.
How Ontario Courts Treat Financial Contributions (Constructive 
Trust Claims)
When a common-law partner contributes financially to the home—such 
as paying part of the mortgage, funding renovations, or covering 
household expenses—they may attempt to make a constructive trust 
claim in court. This type of claim argues that:
 The non-owner’s contributions increased the value of the home or 
reduced the financial burden on the owner.
 It would be unjust for the legal owner to retain full benefit without 
recognizing the other partner’s investment.
While constructive trust claims can succeed, they are often complex, 
costly, and time-consuming. Courts require strong evidence of both the 
financial contributions and the resulting enrichment to the homeowner. 
This uncertainty is why many couples prefer to avoid litigation by 
setting out property rights clearly in a cohabitation agreement.
Recent Ontario Court Cases on Homes and Cohabitation
Ontario courts have dealt with numerous disputes involving common- 
law partners and shared residences, highlighting the risks of not having a 
written agreement. These cases demonstrate how judges balance the 
principles of fairness against the strict rules of property ownership.
Examples Where Common-Law Partners Successfully Claimed 
Interest in a Shared Residence
In several cases, Ontario courts have recognized a constructive trust in 
favour of a non-owner partner who made significant contributions to the 
home. For example:
 Courts have awarded interests where a partner paid towards the 
mortgage, property taxes, or major renovations, even though they 
were not on the title.
 In some rulings, non-financial contributions—such as performing 
extensive labour on home improvements—were also recognized as
creating an equitable interest.
These outcomes show that courts may intervene to prevent unjust 
enrichment when one partner benefits disproportionately from the 
other’s contributions.
Cases Where Lack of an Agreement Led to Disputes
Not all common-law partners are successful. In many disputes, a lack of 
a cohabitation agreement has left one partner without any claim to the 
home. For example:
 Courts have dismissed claims where contributions were deemed 
part of the normal expenses of cohabitation, such as paying for 
groceries or utilities, rather than increasing the property’s value.
 In some cases, partners who moved into a pre-owned home 
without contributing to the mortgage or renovations were left with 
no recognized interest, despite years of living there.
These examples highlight how uncertainty and costly litigation 
could have been avoided with a written agreement setting out each 
partner’s rights.
How Courts Balance Fairness with Legal Ownership
When deciding these disputes, Ontario courts aim to balance fairness 
with the legal framework of property ownership. They typically 
consider:
 The extent and nature of the non-owner’s contributions.
 Whether the owner was unjustly enriched by those 
contributions.
 The expectations of both partners at the time of cohabitation.
Ultimately, while courts may grant equitable remedies, the process is 
unpredictable. Without a cohabitation agreement, outcomes depend
heavily on evidence, credibility, and the judge’s assessment of 
fairness.
Practical Steps for Protecting Property in a Common-Law 
Relationship
For common-law couples in Ontario, proactively addressing property 
issues can save significant time, cost, and stress in the future. Since the 
Family Law Act does not extend the same protections to common-law 
partners as it does to married spouses, it is essential to take practical
steps to secure both partners’ interests.
Discuss Property Ownership Before Moving In
Open and honest conversations about who owns the home and how 
ownership will be treated are crucial before living together. Couples 
should discuss whether the home will remain in one partner’s name, be 
jointly owned, or be transferred in part to the non-owner. Clear 
expectations upfront can prevent misunderstandings down the road.
Draft a Cohabitation Agreement With Full Financial Disclosure
A legally binding cohabitation agreement is the most effective way to 
set out property rights. To ensure fairness and enforceability, both 
partners must provide full financial disclosure, including income, 
assets, debts, and any existing property. The agreement should outline 
who is responsible for mortgage payments, household expenses, and 
what will happen to the property if the relationship ends.
Obtain Independent Legal Advice for Enforceability
For a cohabitation agreement to stand up in court, both partners should 
receive independent legal advice (ILA) from separate lawyers. This 
ensures that each person fully understands the terms and consequences 
of the agreement. Courts are far more likely to enforce an agreement that 
was signed voluntarily, with ILA, and based on complete financial 
disclosure.
Review and Update the Agreement if the Living Situation Changes
Life circumstances can change — couples may purchase a new home, 
refinance a mortgage, or make major renovations. Whenever such 
changes occur, it is wise to review and update the cohabitation
agreement to reflect the new reality. Keeping the agreement current 
ensures that it continues to protect both partners fairly.
Why Legal Advice Matters in Ontario
When it comes to property and housing rights in common-law 
relationships, legal advice is essential. The rules for married and
unmarried couples differ significantly under Ontario’s Family Law Act, 
and without proper guidance, partners can be left vulnerable if the 
relationship ends.
How Family Lawyers Explain Differences between Married and 
Common-Law Rights
A family lawyer can help couples understand the key legal distinctions 
between matrimonial homes (for married spouses) and shared residences 
(for common-law partners). They can explain how property division 
works in Ontario, when special protections apply, and when they do not. 
This guidance ensures that both partners enter into their agreement with 
a clear understanding of their rights and limitations under the law.
Preventing Costly Litigation through Clear Agreements
Disputes about property are among the most expensive and time- 
consuming cases in Ontario family law. By working with a lawyer to 
draft a comprehensive cohabitation agreement, couples can avoid 
uncertainty and reduce the likelihood of court battles. Lawyers ensure 
that the agreement addresses ownership, contributions, buyout 
provisions, and what happens if the relationship ends—leaving little 
room for misinterpretation.
Ensuring Peace of Mind with a Legally Binding Plan
Perhaps the greatest benefit of seeking legal advice is the peace of mind 
it provides. A lawyer ensures that the agreement is not only clear and 
fair but also legally binding and enforceable in court. With independent 
legal advice and full financial disclosure, both partners can feel
confident that their housing rights and financial contributions are 
protected, no matter what the future holds.
Contact us today!
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