A construction lien must be registered within 45 days from the date of the earliest triggering event. The triggering events for a contractor are set out in Section 31(2) of the Construction Lien Act (the “Act”). The triggering events for a subcontractor are set out in Section 31(3) of the Act. There are different triggering events depending upon whether
the lien is for services and materials supplied before or after the date certified or declared to be the date of the substantial performance of the contract.