Quick answer. Ontario has no single statute of limitations for real estate. Most real estate disputes over money damages must be started within two years of the day you discovered the claim under the Limitations Act, 2002. Claims about the land itself, including ownership disputes, deposits on failed purchases, and mortgage enforcement, fall under the Real Property Limitations Act and its ten year period.
Why Ontario Has Two Different Limitation Periods for Real Estate
Two statutes control how long you have to sue over a real estate problem in Ontario. The first is the Limitations Act, 2002, which sets the general two year deadline that applies to most civil claims in the province. The second is the Real Property Limitations Act, an older statute that survived the 2002 reform and continues to govern claims involving rights to land itself. Its main period is ten years.
The two statutes do not overlap. Section 2 of the Limitations Act, 2002 says that Act does not apply to any proceeding covered by the Real Property Limitations Act. So the first question in every real estate dispute is not how much time you have. It is which statute governs your claim. The answer changes your deadline by eight years.
The dividing line is the nature of the claim, not the fact that real estate is involved. A claim for money damages arising from a real estate deal usually gets two years. A claim to recover land, an interest in land, or money charged on land usually gets ten. That distinction sounds simple. In practice it has taken repeated trips to the Ontario Court of Appeal to sort out, and generic articles routinely get it wrong.
When Does the Two Year Limitation Period Apply?
The two year basic period under the Limitations Act, 2002 covers real estate claims where you are asking a court for money damages rather than for the property itself.
They include a buyer suing a seller for damages after a failed closing, claims against a seller for misrepresentation about the condition of the property, negligence claims against real estate agents, home inspectors, or lawyers, damages claims between neighbours for nuisance or negligence such as water damage from a neighbouring property, and disputes over unpaid amounts under a commercial lease. The Court of Appeal has confirmed that a nuisance or negligence claim for damage to property is not an action to recover land, so the two year period applies even though the dispute is about real estate.
The two year clock starts when you discovered the claim, or when a reasonable person in your position ought to have discovered it. That is often not the closing date and not the date the problem was caused. More on discovery below, because it decides most limitation fights.
When Does the Ten Year Limitation Period Apply?
The Real Property Limitations Act applies when the claim is, in substance, about a right to land or money secured by land. Section 4 gives you ten years to bring an action to recover land. Courts have read that phrase to cover more than a simple fight over who holds title.
It covers claims to an ownership interest in a property, including trust claims. If you paid toward a home that was registered in someone else’s name, perhaps a family member, and you now claim a share of it through a resulting or constructive trust, that is an action to recover land with a ten year period. These claims come up constantly in family and estate disputes over jointly funded homes.
It also covers deposits on failed real estate purchases. The statute defines land to include money to be laid out in the purchase of land. In Yim v. Talon International, a 2017 decision, the Ontario Court of Appeal applied the ten year period to a buyer’s claim for the return of deposits on a condominium purchase that never closed. So a buyer fighting to get a deposit back, or a seller claiming a forfeited deposit, is generally working with ten years, not two. We still tell clients to move as if they had two, because whether a particular claim falls on the two year or ten year side of the line depends on how it is framed and courts examine the substance closely.
Mortgage enforcement, covered in its own section below, also sits in the ten year category.
Ontario Real Estate Limitation Periods at a Glance
The table below reflects how these disputes are usually treated. The correct period always depends on the specific facts and how the claim is characterized, so treat this as a map, not a ruling on your case.
| Type of dispute | Usual deadline | Governing statute |
|---|---|---|
| Damages for a failed purchase or sale (suing for money) | 2 years from discovery | Limitations Act, 2002 |
| Misrepresentation about the property’s condition | 2 years from discovery | Limitations Act, 2002 |
| Negligence claims against agents, inspectors, or lawyers | 2 years from discovery | Limitations Act, 2002 |
| Water damage, nuisance, or negligence between neighbours | 2 years from discovery | Limitations Act, 2002 |
| Return or forfeiture of a purchase deposit | 10 years | Real Property Limitations Act |
| Claim to an ownership share of a property (trust claims) | 10 years | Real Property Limitations Act |
| Mortgage enforcement and mortgage arrears | 10 years, restarted by payment or written acknowledgment | Real Property Limitations Act |
| Adverse possession and recovery of land | 10 years of possession, limited on Land Titles land | Real Property Limitations Act |
| Construction lien on a property | Preserve within 60 days, perfect within 90 days after that | Construction Act |
When Does the Limitation Clock Actually Start?
For two year claims, the clock starts on the day you discovered the claim. Under section 5 of the Limitations Act, 2002, that is the day you first knew four things. You knew that injury, loss, or damage occurred. You knew it was caused by an act or omission. You knew whose act or omission it was. And you knew that a court proceeding was an appropriate way to remedy it. If a reasonable person ought to have known those things earlier, the earlier date governs.
Discovery arguments decide most real estate limitation disputes. A buyer who finds basement moisture two winters after closing may argue the clock started when the mould was found, not on closing day. A seller will argue the buyer ought to have investigated the first time water appeared. Courts have also held that you do not need to know the full extent of your damages for the clock to start. Knowing enough to plead a claim is enough.
One caution that surprises almost every client. Negotiating does not pause the clock. If you spend eighteen months exchanging letters with the seller’s lawyer and then talks collapse, you may have six months left, not two years. Only a written tolling agreement, in which both sides agree to stop the clock, protects you while you negotiate.
What Is the Ultimate Limitation Period of 15 Years?
The Limitations Act, 2002 also contains a hard outer cap. No claim governed by that Act can be started more than 15 years after the day the act or omission took place, regardless of when you discovered it. Discoverability does not extend this one. If a contractor’s defective work in 2010 only reveals itself as structural damage in 2026, a damages claim under the Limitations Act is already out of time.
There are narrow exceptions, including where the defendant wilfully concealed the wrongdoing or where the act or omission is genuinely continuous. Courts apply those exceptions strictly. The Real Property Limitations Act has its own separate rule for concealed fraud, which delays the start of the ten year period until the fraud was or reasonably could have been discovered. That rule matters in title fraud cases, where a forged transfer may sit on title unnoticed for years.
What Is the Limitation Period on a Mortgage in Ontario?
Mortgage remedies fall under the Real Property Limitations Act, and the core period is ten years. Section 23 bars an action to recover money secured by a mortgage or other charge on land more than ten years after the right to receive it arose. Section 43 applies a matching ten year period to actions on the covenant to repay contained in the mortgage itself.
The mortgage rules come with a feature the general two year regime does not have. The ten years restarts every time the borrower makes a payment of principal or interest, or gives a signed written acknowledgment of the debt. For a mortgage being paid monthly, the limitation period is a non issue because it resets constantly. It becomes very real for private mortgages that sit dormant. In our practice we regularly review private second mortgages, often between family members or business associates, where no payment has been made and nothing has been signed for years. Once ten clean years pass with no payment and no written acknowledgment, the lender’s right to enforce can be lost entirely.
If you hold a private mortgage that is not being paid, the practical takeaway is simple. Do not let it sit. Get advice well before year ten, and understand that a partial payment or a signed acknowledgment resets the clock.
Adverse Possession and Boundary Disputes
Adverse possession, often called squatter’s rights, is really a limitations doctrine. Under the Real Property Limitations Act, an owner has ten years to bring an action to recover land from someone in possession of it. After ten years of open, continuous, and exclusive possession, the owner’s right to sue is extinguished and the possessor’s claim can mature.
Here is the Ontario detail that generic articles miss. Almost all land in Ontario has now been converted into the Land Titles system, and you generally cannot build a new adverse possession claim against Land Titles land. Time that fully matured before the property was converted from the old Registry system can still be claimed, which is why these cases usually turn on decades old fence lines, driveways, and survey history. When a client in Toronto or Ottawa brings us a boundary dispute, one of our first steps is to pull the parcel register and pin down the conversion date, because that date often decides whether a possession claim is even possible.
Shorter Deadlines That Catch Property Owners Out
Not every real estate deadline is measured in years. The one that ends the most claims is the construction lien timeline under the Construction Act. A contractor or supplier who has not been paid must preserve a lien by registering it on title within 60 days, generally running from substantial performance or from the completion, abandonment, or termination of the contract. The lien must then be perfected, by starting a court action and registering a certificate of action, within 90 days after the last day it could have been preserved. Miss either step and the lien is gone no matter how much is owed.
Other regimes carry their own short notice periods, including claims involving municipalities and new home warranty claims, which run on their own schedules. If your real estate problem involves anyone other than a private counterparty, assume the deadline may be shorter than two years until a lawyer confirms otherwise.
Frequently Asked Questions
How long do I have to sue after buying a house with hidden defects in Ontario?
Generally two years from the day you discovered, or reasonably ought to have discovered, the defect, who was responsible for it, and that suing was an appropriate response. That is often later than the closing date but earlier than people assume, because the first visible sign of a problem can start the clock even if the full extent of the damage only became clear later. A 15 year outer cap applies from the date of the act or omission regardless of discovery.
Is the limitation period for a real estate deposit two years or ten years?
Ontario courts, including the Court of Appeal, have applied the ten year period under the Real Property Limitations Act to claims for the return of money paid toward the purchase of land, because the statute defines land to include money to be laid out in a land purchase. That said, how a claim is framed matters, and related damages claims may still face the two year period. Treat ten years as the likely answer and two years as the safe planning assumption.
Does the limitation period pause while we try to settle?
No. Settlement discussions, mediation, and even a near final handshake deal do not stop the clock. The only reliable ways to protect your position while negotiating are a written tolling agreement signed by both sides or actually starting the court proceeding. Starting a claim does not end negotiations. In our experience it often accelerates them.
Can a mortgage become unenforceable in Ontario?
Yes. Under the Real Property Limitations Act, an action to recover money secured by a mortgage is barred ten years after the right to the money arose, unless a payment of principal or interest was made or a signed written acknowledgment of the debt was given in the meantime. Each payment or written acknowledgment restarts the ten years. This mostly affects private mortgages that have sat in default with no payments and no correspondence for many years.
How long do you have to file a construction lien in Ontario?
A lien must be preserved by registration on title within 60 days, running generally from publication of a certificate of substantial performance or from the completion, abandonment, or termination of the contract, and for subcontractors potentially from their last supply of services or materials. It must then be perfected within 90 days after the last day it could have been preserved. These deadlines are strict, and missing either one usually ends the lien.
What happens if I miss a limitation period?
In most cases the claim is over. The other side can plead the expired limitation period as a complete defence and have the claim dismissed without any ruling on whether you were right. There are narrow exceptions, including wilful concealment, incapacity, and claims involving minors, but courts apply them sparingly. If you think a deadline may have passed, get advice anyway. People are frequently wrong about which statute applied and when their clock actually started, in both directions.
The information provided above is of a general nature and should not be considered legal advice. Every transaction or circumstance is unique, and obtaining specific legal advice is necessary to address your particular requirements. Therefore, if you have any legal questions, it is recommended that you consult with a lawyer.
