Construction Lien in Ontario

Karina Mateo
October 30, 2026

Renovating a home, building a new property, or providing construction services are activities that involve significant investments and may at some point become the subject of disputes over breach of contract. For example, if a contractor completes a renovation and the homeowner fails to pay, or if a subcontractor does not receive payment for the services rendered.

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Often, when these transactions are conducted solely "on trust" or without preventive measures backed by legal advice, the parties are left vulnerable to financial losses.

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To prevent this from happening, Ontario’sConstruction Act provides legal protection to contractors, subcontractors, and suppliers who have not been paid for services or materials provided in connection with a construction project. 

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One of these safeguards is the construction lien.

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In this article, I'll explain who is eligible to apply, what strict deadlines the law requires, and why acting promptly is key to protecting your assets.

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Construction Tax: Purpose and Consequences

A construction lien (or right of retention) is a legal claim against an interest in the property associated with unpaid construction services or materials. Its purpose is to serve as a guarantee of legal protection in the event that the owners or the primary developer fail to cover the cost of the labor, services, or materials used to build or remodel the structure.

This places a restriction on the free disposal of the property, which means that the owner will not be able to easily sell, transfer, or refinance the property with the bank until the debt is paid off and the lien is removed.

Example: If a contractor completes renovations on a residential property and the owner fails to pay, the contractor has the right to legally retain or place a lien on the property. Such a lien can create serious complications for the owners who attempt to transact on the property. 

However, it is important to clarify that a lien does not automatically establish that the amount claimed is definitively owed; it is a provisional mechanism to ensure financial backing while the dispute is being resolved.

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Who can register a construction lien?

Under the Ontario ConstructionAct, lien rights are available to a wide range of parties involved in the project:

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  • General contractors: Those who lead and coordinate the main construction project with the owner.

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  • Subcontractors: Individuals or companies hired by the principal contractor to perform specific parts of the work.

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  • Building materials suppliers: Those who supply the materials, products, or raw materials used in the building.

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  • Business owners and tradespeople: Such as plumbers, electricians, carpenters, and installers who provide their direct labor.

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  • Certain professionals: architects, engineers, or consultants who provide technical services to improve construction.

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It is important to note that a direct contract with the property owner is not always required to exercise this right. 

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If you work as a subcontractor on a construction project and the general contractor does not pay you, the law allows you to register a lien directly on the property, even if you have not signed a face-to-face agreement with the owner.

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Are there any deadlines?

Yes. Under Ontario law, rights related to construction liens are subject to strict time limits established by law. 

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Under the general rules, this process is divided into two key stages:

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  1. Preservation (60 days): The lien must be legally registered within 60 days of the event giving rise to the claim. 

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  1. Finalization (additional 90 days): Once the lien has been duly preserved, as a general rule, it must be finalized through the appropriate legal procedures within an additional period of 90 days from the expiration of the preservation period.

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The exact deadlines may vary depending on the specific contractual relationships between the parties, the status of the project, and applicable regulations; therefore, it is essential to review each individual case.

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What should you do after a lien has been recorded?

Once the lien is formally registered on the property, the parties involved typically explore various options for resolving the dispute:

  • Options for the parties involved

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  • Negotiation or dispute: The parties involved can negotiate the outstanding payment directly, challenge (question) the validity of the claim, or debate whether the amount demanded is correct.

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  • Legal Proceedings: If a mutual understanding cannot be reached, the parties may initiate the appropriate formal proceedings before the courts.

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  • Motion for a Court Order to Lift the Lien

The law also provides practical options for property owners. If a property owner needs to sell, transfer, or refinance their property on an urgent basis while the dispute is ongoing, they may request a court order to remove the lien from the title. 

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To do so, you must post an adequate financial guarantee with the court, which allows the property to be released while the main dispute continues to be heard separately.

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Why It's Important to Understand How Construction Liens Work: Roles and Risks

The construction lien is a two-pronged legal mechanism. How it is understood and properly handled varies drastically depending on the role one plays in the dispute:

  1. Role of contractor or service provider (the party claiming payment)

For contractors, subcontractors, suppliers, and tradespeople, a lien is the most powerful safeguard for recovering unpaid money .

  • The main risk lies in missing a legal deadline due to negligence or by relying on verbal agreements that compromise the only security interest in the property. Once the deadlines have passed, the debt is left unprotected against an uncertain ordinary lawsuit.
  • Understanding and adhering to the deadlines for preservation and enforcement is essential to ensuring payment for your services and avoiding total financial loss.

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  1. Role of the owner (the person who receives the claim or faces the lien)

For the property owner, the lien acts as a restriction or encumbrance that temporarily limits the owner's ability to conduct business involving the property.

  • The main risk lies in responding impulsively or ignoring the summons without understanding the legal consequences.
  • Please note that a registered lien does not automatically and definitively validate the debt, but it does restrict the free disposal of the property. 

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Final Recommendations

Whether you are claiming a payment or challenging a construction lien, it is advisable to seek timely legal advice to mitigate risks, avoid procedural errors, and adequately protect your interests and assets.

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Learn about the legal options available if you face a lien on your property.

Keep in mind that alternatives such as posting a security deposit with the court to release the title will allow you to continue with critical transactions (such as selling or refinancing) while the dispute is resolved separately.

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Are you involved in a construction dispute in Ontario and need legal representation? At Immiland Law, we can help you.

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‍Please fill out this form and provide us with the details so we can determine whether we can represent you.

At Immiland Law, we're here to help you settle in Canada legally and protect your rights.
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I hope this information gives you peace of mind and helps you know how to proceed correctly.

With love,

‍Immiland Law Professional Corporation