Anonymised, illustrative composite. An Ontario drywall subcontractor waited for a general contractor’s substantial-performance notice that never came on time, and lost the one deadline that mattered.
At a glance
The firm had finished its scope and was waiting for the general contractor to publish a certificate of substantial performance before starting the lien-deadline clock, as it had on past jobs. On this job the certificate was late, and nobody had calendared the alternative trigger.
Ontario’s Construction Act gives a lien claimant two deadlines, and the first one does not wait for a certificate: as Treadstone Law explains, a claimant must “preserve within 60 days,” with the clock starting from “publication of a certificate of substantial performance, completion, abandonment or termination of the contract, or your own last supply of services or materials” — whichever applies to that claimant’s position in the chain. For a subcontractor with no certificate yet published, the operative date is its own last supply.
The firm’s last delivery of material and labour on site was March 2, which made the 60-day preserve deadline May 1. The claim for lien was registered on May 5 — four days after the deadline. The amount at risk was $86,400: final progress billing plus accrued holdback still owed on the contract.
The four-day miss did not shrink the amount owed; it removed the security behind it. As the same source states, “there is no relief for lateness” — missing the deadline “does not end your right to sue for the money owed — the contract claim survives — but you lose the security.”
The 60-day preserve deadline is strict and unforgiving of the reason for the delay: it does not matter that the firm was waiting in good faith for a certificate that never came, because the deadline runs from the firm’s own last supply regardless of whether any certificate has been published. Once the deadline passes, the lien — the right to have the $86,400 secured against the property and paid ahead of unsecured creditors — is gone. What remains is an ordinary breach-of-contract claim against the GC, worth pursuing but worth much less in practice.
The firm pursued the $86,400 as an unsecured contract claim rather than a secured lien claim, and settled for roughly $61,000 after factoring in the GC’s limited assets and the cost of litigating without lien priority — a fraction of what timely preservation would likely have recovered in full. The firm now calendars “last supply date plus 60” the day materials or labour stop on every job, rather than waiting on a GC’s notice. See how construction lien deadlines get tracked in Ontario and how holdback release dates get tracked. A related recovery after a GC’s collapse, in BC, is in how a framing sub recovered holdback after a GC collapse.
The $86,400 secured by a timely lien and the $86,400 pursued as an unsecured claim are not the same recovery in practice: the firm settled the unsecured version for roughly $61,000, about 71% of face value, once the GC's limited assets and the cost of litigating without lien priority were factored in. A lien preserved on or before May 1 would have ranked the claim ahead of the GC's unsecured creditors on the same $86,400, with no reason to discount it for a GC that could not pay everyone.
Ontario is not the only province with a strict preservation deadline, and the trigger event is not the same everywhere. British Columbia's Builders Lien Act ties its filing window to a certificate of completion directly — 45 days after that certificate is issued — rather than to a claimant's own last supply the way Ontario's 60-day rule runs absent a certificate. A subcontractor working across both provinces is tracking two different trigger events on two different clocks, not one rule with two names.
Calendar the deadline the day the last delivery of material or labour leaves the yard, using the earliest possible trigger date available under your province's Act — waiting for a certificate that has not been published yet is waiting for a trigger that may never arrive on the timeline you need.
The firm's habit of waiting for a GC-published certificate of substantial performance before starting its own deadline clock had worked on every prior job, because a certificate had always been published before the 60-day window from last supply would otherwise have expired. That habit only becomes a failure once a certificate is late, and nothing about the rule itself allows a claimant to know in advance which case it is dealing with. Calendaring from a subcontractor's own last supply date, rather than from an event controlled by someone else, removes that uncertainty entirely: the claimant's own record of when work stopped is always available on day one, while a certificate's publication date is not.
A 30-minute call is enough to tell you whether AI pays for itself here.
