Lien Preservation & Deadlines

What This Issue Involves

Construction lien deadlines in Ontario refer to the strict statutory timelines that determine whether a construction lien exists at all. Under Ontario’s Construction Act, lien rights only survive if a lien is preserved and later perfected within fixed time periods. These timelines are not guidelines; they are conditions of the right itself.

Preservation and perfection are two separate steps, and understanding lien preservation vs. perfection is critical. Preservation involves securing the lien in a manner permitted by the Act, most commonly by registration on title. Perfection requires commencing an enforcement action and registering a certificate of action after preservation. If either step is missed, the lien expires automatically.

When This Issue Typically Arises

Lien timing problems most often arise when there is non-payment and parties delay taking action while attempting to resolve matters informally. In many cases, the statutory lien timelines begin running before anyone realizes it. Deadlines may be triggered by the publication of a certificate of substantial performance, or by completion, abandonment, or termination of the contract.

For subcontractors and suppliers, timelines may also run from the last supply of services or materials. On larger projects, preservation periods can begin when a certificate of substantial performance is published in a prescribed construction trade publication, even if payment discussions are ongoing.

Why Timing and Strategy Matter

These statutory deadlines are strictly enforced. Courts have no discretion to extend them, even where payment is clearly owed. The Construction Act prioritizes certainty in the construction industry, and as a result, lien rights disappear automatically when the required time periods are missed.

Strategy matters because preservation and perfection often intersect with interim adjudication, negotiations, and insolvency risks. Acting too late—or acting without a coordinated plan—can eliminate the strongest security available to an unpaid party.

Common Mistakes and Risks

A frequent mistake is assuming that lien timelines run from the date of the last invoice or final payment request. In reality, the applicable time periods are tied to specific statutory trigger events that may occur without direct notice.

Another common risk is confusing preservation with perfection. Registering a lien alone does not keep it alive indefinitely. If enforcement steps are not taken within the required timeframe, the lien expires even though it was properly preserved.

How Fridmar Law Can Assist

Fridmar Law helps clients identify when the lien period begins, determine whether preservation or enforcement is still possible, and take timely steps to protect payment rights. We routinely advise contractors, subcontractors, and owners on how statutory lien requirements interact with trust claims, interim adjudication, and broader dispute strategy.

Where timelines have already passed, we assess alternative recovery options and help clients understand what remedies may still be available.

When to Speak With a Lawyer

You should speak with a construction lawyer as soon as payment issues arise—not just when a deadline is approaching. Early advice can clarify trigger dates, protect lien rights, and prevent irreversible mistakes.

Legal guidance is especially important where projects are complex, involve multiple parties, or are affected by financial distress or insolvency, where lien security may be critical.