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Open Permits and Unregistered Work on an Ontario Home Purchase

Learn the risks of an open building permit or unpermitted renovation on an Ontario home purchase, what sellers must disclose, and your closing options.

Real Estate4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • Ontario follows buyer beware, but a seller must disclose latent defects that make a property unfit for habitation, dangerous or potentially dangerous.
  • A seller who conceals a patent defect can lose the protection of buyer beware.
  • How an open permit is closed and what a municipality requires varies, so confirm the steps with a lawyer and the local building department.

An open building permit or an unpermitted renovation can appear late in a purchase, often through a lawyer's search or a home inspection. It can affect the price, the closing date and your plans for the home.

This article explains the general risks, what a seller must disclose, and the options people often use to deal with it. Municipal processes differ, so the details for your home need to be confirmed locally.

What open permits and unpermitted work mean

An open permit means building work was approved by the municipality but the file was never closed, often because a final inspection did not happen. Unpermitted work is work that was done without the permit that was needed.

Both can leave questions about whether the work meets the building code. A buyer may inherit the problem, including the cost of inspections, corrections or, in some cases, removal.

What a seller must disclose

Ontario follows buyer beware. A seller generally need not disclose patent defects, which a buyer can find through reasonable inspection and inquiry. A seller must disclose latent defects that make the property unfit for habitation, dangerous or potentially dangerous. These duties come from case law, not TRESA.

A seller who conceals a patent defect can lose the protection of buyer beware. Failing to disclose a latent defect may be treated as misrepresenting the property, and wilful blindness can also create liability.

A seller property information statement is not a required form, and it is based on the seller's own knowledge and experience. If the seller has prepared one, the seller's agent must tell every interested buyer it exists and give a copy to any buyer who asks. Ask for it and read what it says about renovations.

Options when you learn of the issue

What is possible depends on your agreement and how much time is left. Whether a particular municipality will close a permit, and what it will require, varies and should be confirmed with the local building department.

If a deal falls apart or work is unpaid

If a seller refuses to close, a buyer who sues uses a certificate of pending litigation to protect the claim, because starting a lawsuit about an interest in land is not notice to outsiders until the court issues the certificate and it is registered on title. A court may discharge the certificate in several cases, for example where the party claims money instead of the land. Separately, a court that can order specific performance may award damages in addition to specific performance or instead of it.

Unpaid contractors are another risk. A contractor's construction lien generally expires unless it is preserved within 60 days, counted from the earliest of the events listed in s. 31(2) of the Construction Act, such as the contract being completed, abandoned or terminated. A preserved lien also expires unless it is perfected within 90 days. It is worth checking title for registered liens before you close.

What to do next

Frequently asked questions

Does a seller have to tell me about unpermitted work?

It depends on the facts. A seller must disclose latent defects that make the property unfit for habitation, dangerous or potentially dangerous. A seller who conceals a patent defect can lose the protection of buyer beware.

Is a seller information statement required?

No. It is not a required form, but if the seller has prepared one the agent must tell every interested buyer and give a copy to any buyer who asks.

Can I refuse to close because of an open permit?

Whether you can refuse to close, and what could follow if you do, depends on your situation, so it is worth confirming with a lawyer first.

How is an open permit closed?

The process depends on the municipality and the work involved. Contact the local building department and ask your lawyer to confirm the steps and timing.

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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