Squatters' Rights in Ontario: What Landlords Need to Know

This article is general information, not legal advice. Squatter and possession situations turn on specific facts and can escalate quickly. For a real situation, consult a lawyer or your provincial land authority.

"Squatters' rights" is one of those phrases that sounds more dramatic than the law behind it. In Ontario, the real legal concept is adverse possession: the idea that someone who openly occupies land they do not own, for long enough and in the right way, could eventually claim title to it. For most modern Ontario property owners, the practical answer is reassuring, but the details matter, and the biggest risk is usually not a true squatter at all.

What adverse possession actually requires

Adverse possession in Ontario is governed by the Real Property Limitations Act. To claim it, a person has to prove their possession of the land was, for at least ten continuous years:

• Open and notorious — obvious, not hidden.
• Exclusive — they used it as an owner would, not shared with the true owner.
• Adverse — without the owner's permission.
• Peaceful and continuous — uninterrupted across the full period.

The "without permission" element is the one that quietly defeats most claims. The moment an owner gives permission, or the occupant acknowledges the owner's title, the clock stops. Possession that started as a favour, a handshake, or a tenancy is not adverse.

Why new claims have nearly disappeared: the Land Titles system

Here is the part that matters most for anyone buying property in Ontario today. The province runs two land registration systems: the older Registry system and the modern Land Titles system. The Land Titles Act says that no new title can be acquired by adverse possession against land registered under it.

Over the last few decades Ontario converted the vast majority of its land into Land Titles, a process largely complete by around 2010. The bar applies to possession that begins after a parcel is registered under Land Titles: once land is converted, a squatter generally cannot gain ownership by occupying it, no matter how many years pass. The only opening left is the historical one, where the required period was already complete before conversion, which the next section covers.

The important exception is historical: a claim is recognized if the full ten-year period was completed before the land was converted to Land Titles. Those matured claims were grandfathered; new ones cannot start on registered land. In practice this makes new adverse possession claims rare, though historical claims that matured before conversion remain valid, and occasionally decisive.

A 2025 Supreme Court of Canada decision is the reason to stay precise about that last point. In Kosicki v. Toronto, the Court held that municipal parkland is not automatically immune from adverse possession unless a statute specifically exempts it, and the homeowners in that case acquired a fenced-off strip of city parkland because their possession had run openly and continuously since long before the land entered Land Titles. The lesson is not that anyone can claim public land tomorrow; it is that possession which matured before conversion can still ripen into title, even against a municipality. New possession on registered land is closed off, but old, completed possession can still surface.

The rest of Canada, briefly

Adverse possession exists in some form across most provinces, but the rules and limitation periods differ, and several provinces have restricted or effectively abolished it for registered land in much the same way Ontario has, including British Columbia and, as of December 2022, Alberta. The headline is consistent nationwide: modern land registration systems have made acquiring someone else's registered land by occupation very difficult. We cover the national picture in squatters' rights in Canada. Confirm the specifics with the land authority in your province before relying on any of it.

The real risk for landlords: a squatter is not a tenant who overstays

For a landlord, the word "squatter" is often used loosely for two very different situations, and the law treats them in opposite ways.

• A true trespasser is someone who entered and stayed without ever having permission, and who never paid rent or was accepted as an occupant. This is a property and trespass matter, and police involvement may be appropriate.
• A tenant who overstays — someone you rented to, accepted rent from, or allowed to move in — is not a squatter. They are covered by the Residential Tenancies Act, and you cannot remove them by changing the locks or calling the police. You have to go through the Landlord and Tenant Board.

The dangerous middle ground is the occupant who began as a guest and started paying you, or who you informally let stay. That arrangement can create a tenancy, which means the protections and the formal eviction process apply. Treating a tenant as a trespasser, or trying to force them out yourself, exposes a landlord to serious liability. When someone has paid rent or been accepted as an occupant, the lawful path runs through the Board, not around it. We walk through that process in our guide to how eviction works in Ontario.

How owners protect themselves

The defences against possession claims and informal-occupant problems are unglamorous and effective:

• Keep your land registered and your boundaries clear. Land Titles registration is itself the strongest protection against adverse possession.
• Document permission. If you let anyone use part of your property, put the permission in writing. Permission is the single fact that prevents possession from being "adverse."
• Do not let occupancy go undefined. An informal arrangement that drifts for months is how a guest becomes a tenant. Define the relationship from the start with a written agreement.
• Watch unused or vacant property. Open, exclusive, continuous use by someone else is what the doctrine rewards. Periodic inspection and a clear record of your own use shut it down.
• Keep a durable record of the property. Clear ownership records, dates, and correspondence are what turn a dispute into a quick answer.

A complete, dated record of who occupied a property, under what permission, and when, is exactly the kind of thing that is easy to lose and painful to reconstruct. Keeping the title documents, agreements, and correspondence for a property in one place is what Habyn's property records are built for, and a written tenancy on file through lease management is what keeps an occupant from ever becoming an undefined one.

Frequently asked questions

Can someone really take my property by squatting in Ontario?

For land registered under the Land Titles system, which is now almost all Ontario land, the answer is effectively no. The Land Titles Act bars new adverse possession claims, so occupying registered land does not create ownership rights no matter how long it continues.

How long does someone have to occupy land to claim adverse possession?

The Real Property Limitations Act sets a ten-year period of open, exclusive, adverse, and continuous possession. But for most property that period also had to be completed before the land was converted to Land Titles, which is why new claims rarely succeed today.

Is a tenant who refuses to leave a squatter?

No. Anyone you rented to, accepted rent from, or allowed to move in is a tenant under the Residential Tenancies Act, not a squatter. You cannot remove them yourself; you have to go through the Landlord and Tenant Board's process.

What should I do if someone is occupying my property without permission?

It depends on whether they were ever a tenant or accepted occupant. A true trespasser who never had permission is a police and property matter. Someone who paid rent or was let in is a tenancy matter for the Board. Because the line is consequential and easy to get wrong, get legal advice before acting.

Does adverse possession apply to municipal or public land?

It can. In Kosicki v. Toronto (2025), the Supreme Court of Canada held that municipal parkland is not automatically immune from adverse possession unless a statute specifically exempts it, and the homeowners in that case acquired a strip of city parkland whose occupation had matured before the land was converted to Land Titles. Public ownership is not, by itself, a shield.