We have a Material Supplier that is stating their legal department claims they must file Lien on a Non-Residential project "within 30 days of the Substantial Completion Date". From my research this is not correct. Furthermore, we are a finish trade Subcontractor and rarely are we even complete with Punch and off a job within 30 days of the Substantial Completion Date. Then, there may be multiple Change Orders that keep us on that job even longer, which means we will still be purchasing materials allotted to the project. Sometimes, by the time we are provided a Substantial Completion Date from the GC, it could already be well past 30 days of the date specified. If this Supplier starts filing Liens based off this rule of thumb, we are going to have some extremely upset GCs and Owners. What exactly is the deadline for a Material Supplier to file a Lien? Note that this question pertains to a Material Supplier only, no Retainage is held on their invoices.