Two siblings inherit a house together. One wants to sell and move on; the other wants to keep it, or just won’t answer the phone about it. A friend or an unmarried partner who bought an investment property with someone else hits the same wall. Ontario’s Partition Act gives any co-owner in that position a legal path to force a sale, whether the other owner agrees or not. It’s neither the formality some assume nor the last resort nobody survives. This guide covers non-matrimonial co-ownership specifically, siblings, friends, unmarried partners and co-investors, not a married couple’s matrimonial home, which a different statute governs entirely. For everything else a forced sale intersects with, see our complete Toronto real estate guide.
What the Partition Act is, and who can apply
The Partition Act, R.S.O. 1990, c. P.4, is a short, old Ontario statute that does one job: it gives a co-owner of land a way to end shared ownership, by physically dividing the property or, far more commonly for an ordinary house or condo, by selling it and dividing the proceeds. Section 2 names who can be brought into this process: joint tenants, tenants in common, and, notably, mortgagees or other creditors who hold a lien against the property. Section 3 sets out the application itself, available to any person interested in the land, and it specifically allows the court to order a sale rather than a physical division where a sale is more advantageous to everyone involved. For a detached house or a condo unit, a physical split is rarely practical, so a sale is almost always the real outcome.
This matters for exactly the situation described above: siblings who inherited a property together, friends or unmarried partners who bought one jointly, or co-investors in a rental property, where one owner wants out and the others won’t agree to sell or buy them out voluntarily. Any one of them, regardless of how small their share is, can start this process.
Do courts really grant this almost automatically
Close to it, and that’s a genuinely important thing for a reluctant co-owner to understand going in. Courts describe the right to partition or sale as “prima facie,” meaning the person applying doesn’t need to prove a good reason or show the other owner did anything wrong. Simply being a co-owner who wants out is enough to start the process.
The real exception is narrow and specific: a court can refuse the application if the other owner proves it’s malicious, vexatious, or oppressive. That’s a demanding legal standard, not a low bar dressed up as a high one. In one Ontario case consistently cited across the law-firm sources covering this area, a court found an application both vexatious and malicious where a co-owner used the Partition Act to try to thwart the legitimate concerns of the majority of the other co-owners, rather than to pursue a genuine exit from the ownership arrangement. That’s the kind of conduct the exception is built for: using the Act as a weapon in some other dispute, not simply wanting to sell. A co-owner who’s reasonable about timing, who hasn’t engaged in bad faith toward the others, and who genuinely wants to exit the ownership arrangement will almost always clear this bar. A binding co-ownership agreement that already sets different terms for how and when a sale happens can also change the outcome, since the court weighs the parties’ own prior agreement alongside the statutory right.
What it actually costs and how long it takes
Sources genuinely disagree on exact figures here, which is itself the honest answer: the real cost and timeline depend almost entirely on how hard the other owner fights it, not on a fixed schedule. Court filing fees are modest on their own, roughly $224 to start an application and around $408 for a motion or hearing. Legal fees vary the most: a straightforward, uncontested application, one the other owner doesn’t fight, typically runs $3,000 to $5,000 in legal fees. A genuinely contested one, with motions, delays, and real disagreement over the property’s value or the sale process, can run $10,000 to $20,000 or considerably more.
Timeline follows the same pattern. Getting a court date for a contested motion typically takes three to eight months. Once a court actually orders the sale, preparing the property, listing it, and closing the transaction adds roughly another two to three months on top of that. If the other co-owner actively evades being served with the application or repeatedly seeks adjournments, delaying tactics genuinely available to someone determined to slow things down, the whole process can stretch past a year. An application nobody contests can close in a fraction of that time. One that gets fought every step of the way is a different, much longer undertaking.
What happens to an existing mortgage or lien
An existing mortgage or lien doesn’t block this process; it becomes part of it. Section 2 of the Act specifically names mortgagees and other lienholders as parties who can be brought into a partition proceeding alongside the co-owners themselves, because they have a financial interest in what happens to the property.
Sale proceeds from a court-ordered partition don’t go straight to the co-owners. They’re paid into court first, and a judge (or a court-appointed referee) orders how they’re distributed, following a priority order rather than an even split. Unpaid property taxes get paid first, ahead of any mortgage or lien. After that, mortgages and liens are generally paid in order of when each was registered, so an older mortgage gets paid before a judgment registered more recently. If only one co-owner took out a mortgage or has a lien against their own individual share, rather than one affecting the whole property, that debt is typically paid solely out of that co-owner’s portion of the proceeds, not deducted from the other owner’s share.
Avoiding court entirely
A partition application is the fallback, not the default, and most co-owner disputes never need it. A negotiated buyout, where one owner pays the other a fair amount for their share based on an independent appraisal, resolves the situation directly and usually faster and cheaper than any court process. Mediation, a neutral third party helping the owners work out terms without a judge deciding for them, is a common step before anyone files anything. Arbitration is a further option where the owners want a binding decision without a full court proceeding.
The cleanest fix happens before a dispute ever starts: a co-ownership agreement, signed when co-owners first buy together, that spells out what happens if one wants out later. A well-drafted agreement can include a “shotgun clause,” where one owner names a price for their share and the other must either buy at that price or sell their own share at the identical price, settling a future deadlock privately and in advance rather than leaving it to a court years later. Anyone buying property jointly with a sibling, a friend, or a co-investor, who doesn’t already have one of these agreements in place, is relying on exactly the court process described above if the arrangement ever sours. Our guide to transferring property title to a family member in Ontario covers a related situation: what it takes to add or remove someone from title directly, sometimes the simpler fix if all parties actually agree.
Does it work differently for joint tenants and tenants in common
No. The Partition Act applies the same way regardless of which form of co-ownership is on title. Our guide to joint tenancy versus tenants in common in Ontario covers the difference between the two, mainly how a share passes on death, in full, so it isn’t repeated here. What matters for this guide is simpler: whether you hold your share as a joint tenant or as a tenant in common, you have the same right to apply under this Act if the co-ownership stops working. A related situation, what happens to title when a joint tenant dies rather than wanting out while alive, is covered in our guide to survivorship applications in Ontario.
Frequently asked questions
What is the Partition Act, and who can use it?
It’s an Ontario statute, R.S.O. 1990, c. P.4, that lets a co-owner of land end shared ownership, either by physically dividing the property or, for an ordinary house or condo, by selling it and dividing the proceeds. Section 2 names joint tenants, tenants in common, and even mortgagees or other lienholders as parties who can be brought into the process. Any co-owner can apply, regardless of how large or small their share is, and the court has the power to order a sale instead of a physical division wherever that’s the more practical outcome. This guide covers non-matrimonial co-ownership specifically, siblings, friends, unmarried partners and co-investors, not a married couple’s matrimonial home, which the Family Law Act governs under a different test entirely.
Is it true that courts almost always grant a partition application?
Close to true. The right is described as “prima facie,” meaning an applicant doesn’t need to prove a reason or show the other owner did anything wrong, simply wanting out of a shared property is enough to start the process. The real exception is narrow: a court can refuse the application if the other owner proves it’s malicious, vexatious, or oppressive, a demanding standard courts have found met only where the applicant was using the Act to pressure the other owner over some unrelated dispute rather than genuinely seeking an exit. A reasonable co-owner who hasn’t acted in bad faith toward the others will almost always clear that bar. A binding co-ownership agreement that sets its own terms for a future sale can also change how a court approaches the application.
How much does this actually cost, and how long does it take?
There’s a real range rather than one fixed figure, because the cost and timeline depend heavily on whether the other owner contests it. Court filing fees are modest, roughly $224 for the application and around $408 for a motion or hearing. Legal fees for an uncontested application typically run $3,000 to $5,000; a genuinely contested one can run $10,000 to $20,000 or more. Getting a court date for a contested motion generally takes three to eight months, with another two to three months to list and close the sale once a court orders it. If the other owner evades service or seeks repeated adjournments, the whole process can run past a year. An uncontested application moves far faster than a fought one.
What happens to an existing mortgage during a partition sale?
It gets paid out of the proceeds, in a specific order, rather than simply disappearing or splitting evenly with everything else. Sale proceeds from a court-ordered partition are paid into court, and a judge orders how they’re distributed. Unpaid property taxes are paid first, ahead of any mortgage. After that, mortgages and liens are generally paid in order of their registration date, with an older mortgage paid before a more recently registered lien. If a mortgage or lien applies to only one co-owner’s individual share rather than the whole property, it’s typically paid solely from that owner’s own portion of the proceeds, leaving the other co-owner’s share untouched by a debt that was never theirs.
Is there a way to avoid going to court over this entirely?
Yes, and most co-ownership disputes resolve this way rather than through a partition application. A negotiated buyout, one owner paying the other a fair amount for their share based on an independent appraisal, settles the situation directly, usually faster and more cheaply than court. Mediation, bringing in a neutral third party to help work out terms, is a common step before either side files anything, and arbitration offers a binding decision without a full court process. The cleanest fix happens before a dispute ever starts: a co-ownership agreement signed when owners first buy together, which can include a “shotgun clause” letting one owner name a buyout price the other must either match or accept for their own share, settling a future deadlock privately and in advance.
A co-ownership dispute that’s reached the point of forcing a sale is already a real transaction in motion, not a hypothetical one. Whether you’re the owner applying or the one being asked to sell, talk to our team about pricing and listing the property while the legal process plays out, so the sale itself doesn’t lose more time than the dispute already has. For the ownership question that usually comes before this one ever arises, see our guide to joint tenancy versus tenants in common in Ontario, our full Toronto real estate guide, or the rest of our guides.