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Cohabitation Agreement Cost in Ontario: What Affects the Price?

See what drives the work behind an Ontario cohabitation agreement, from assets and disclosure to independent advice, so you can plan before you start.

Family Law5 min readTSLBy the Treadstone Law Team · OntarioUpdated November 1, 2026
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Key takeaways
  • A cohabitation agreement can cover property, support and other matters, so the more you want it to address, the more work it involves.
  • Disclosure of assets and debts matters because a court may set aside an agreement where significant ones were not disclosed.
  • Ontario's guidance says each partner should speak to a different lawyer and exchange financial information before signing.

Couples often ask what a cohabitation agreement costs. There is no single answer, because the work depends on your situation. This article does not quote prices. It explains what makes an agreement simpler or more involved so you can plan and ask better questions.

A cohabitation agreement is a contract between two unmarried people who live together or plan to. Understanding what goes into it helps you gather the right information and avoid delays.

What the agreement can cover

Two unmarried people who are cohabiting or intend to cohabit may make a cohabitation agreement. It can set their rights and obligations during cohabitation, on separation or on death, including ownership or division of property, support, the education and moral training of their children, and any other matter in settling their affairs.

The wording means an agreement can be signed after the couple has already moved in. The broader your list of topics, the more drafting and discussion are needed.

It helps to know what applies without an agreement. Ontario says common-law couples are not legally required to split property acquired while they lived together, and that furniture and household items belong to the person who bought them. However, a partner who contributed to property the other owns may have a right to part of it, and may have to go to court if the owner will not agree to repay. An agreement is one way to set out something different that suits your own circumstances.

Support is another reason couples make an agreement. For support claims, the Family Law Act treats two unmarried people as spouses if they have cohabited continuously for at least three years, or are in a relationship of some permanence and are the parents of a child. An agreement can address support, though a court may still set aside a support waiver in some cases.

Main factors that drive the work

Disclosure and independent advice

A court may set aside a domestic contract, or any provision in it, if a party failed to disclose significant assets, debts or other liabilities that existed when it was made, if a party did not understand its nature or consequences, or otherwise under the law of contract. This is why disclosure and independent advice matter.

Ontario's guidance advises that partners should speak to different lawyers and exchange financial information before signing. Each partner having their own advice means two sets of work rather than one, which is a reason total costs for a couple can be higher than they expect. It also helps the agreement stand up later.

The Act's formal requirements do not list independent legal advice. Even so, a court may set aside an agreement if a party did not understand its nature or consequences.

Keeping the process efficient

SituationLikely effect on the work
Few assets, similar finances, agreement on termsFewer issues to draft and review
Home, business or pension owned by one partnerMore terms to consider, including how each is treated on separation
Children from a prior relationshipMore child-related and support issues to weigh
Partners disagree on key termsMore negotiation and revisions
One partner expects to marry laterConsider how the agreement becomes a marriage contract

If the agreement later becomes a marriage contract, any provision that tries to limit a spouse's matrimonial home rights is unenforceable. That is worth raising early.

Changes cost time too. An agreement that amends or rescinds a domestic contract must also be in writing, signed by the parties and witnessed. If you separate, couples who cohabited may make a separation agreement setting their respective rights and obligations.

What to do next

Frequently asked questions

How much does a cohabitation agreement cost in Ontario?

It depends on your assets, how much you agree on, and how many topics the agreement covers. Ask a lawyer how they will scope and charge for the work before you start.

Do we each need our own lawyer?

Ontario's guidance says partners should speak to different lawyers and exchange financial information before signing. The formal signing rules do not list independent legal advice, but a court may set aside an agreement if a party did not understand its nature or consequences.

Can we sign after we already live together?

Yes. The Act allows people who are cohabiting or intend to cohabit to make an agreement, so it can be signed after you have moved in.

Can the agreement decide parenting time?

No. A cohabitation agreement cannot fix decision-making responsibility or parenting time for children. A court may also disregard education or parenting terms where doing so is in the child's best interests.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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