Does a Paid Invoice Protect a Commercial Property from Mechanic's Liens?
In commercial roofing, a common misconception is that a cancelled check or a 'paid' stamp on a contractor's invoice satisfies the legal requirements to protect a property from third-party claims. While these documents confirm you have fulfilled your obligation to the prime contractor, they do not prevent subcontractors, labor forces, or material suppliers from placing a mechanic's lien on the title if they were not paid by the contractor.
The Role of the Preliminary Notice
Under California law, most commercial roofing material suppliers and subcontractors will issue a 'Preliminary 20-Day Notice' shortly after the project begins. This document is a legal prerequisite for their right to file a lien. A paid invoice to the prime contractor does not extinguish the rights established by these notices.
Verification Requirements
To ensure a project is truly clear of financial encumbrances, facility managers must collect specific statutory documents.
- Conditional Waiver and Release Upon Progress Payment: Provided with every progress billing.
- Unconditional Waiver and Release Upon Progress Payment: Provided once the previous payment has cleared the bank.
- Unconditional Waiver and Release Upon Final Payment: This is the only document that legally confirms all parties—including the prime contractor, their subs, and their suppliers—have been paid in full and waive all future lien rights.
Risk Beyond the Prime Contractor
Commercial roofing projects often involve significant material costs (e.g., membrane, insulation, adhesives). If a contractor experiences a cash flow disruption, they may use your project funds to pay for a previous project's materials. In this scenario, the supplier of your materials remains unpaid. Without an unconditional waiver from that specific supplier, the property owner remains liable for that cost, effectively paying for the roof materials twice to clear the title.
Key Takeaways
- Invoice vs. Waiver: An invoice is a request for payment; a waiver is a legal release of a claim against your property.
- Track Preliminary Notices: Maintain a log of every entity that sends a preliminary notice and do not issue final payment until an unconditional waiver is received from each one.
- Timeline Awareness: Lien risks often materialize weeks after the contractor has left the site.
Next step
Cross-reference your list of received Preliminary Notices against your collected Unconditional Waivers before authorizing final project closeout.