Which type of filing is necessary for a contractor to enforce a lien for unpaid services?

Filing a Notice of Completion and a mechanic's lien is essential for a contractor to enforce a lien for unpaid services. The Notice of Completion is a formal declaration that the work on the project is complete, which can initiate the timeline for other parties to file liens. This notice serves as a critical legal step that provides notice to all parties involved, establishing the end of work and allowing for the calculation of the lien period.

The mechanic's lien is a legal claim against a property for unpaid work related to its improvement. By filing both the Notice of Completion and the mechanic's lien, the contractor ensures that their claim is formally recognized and that they have the right to seek payment for their services rendered. This combination of filings is crucial because it helps protect the contractor's interests and provides a clear path to enforce their rights in the event of non-payment.

The other options, while related to construction and contractor processes, do not specifically address the necessary steps to enforce a lien for unpaid services. A Notice of Commencement is more about initiating work rather than enforcing payment, while a construction complaint pertains to disputes but not specifically to lien enforcement. A lien waiver is a document that relinquishes the right to file a lien and is counterproductive for a contractor seeking to enforce