Ohio's Notice of Commencement under ORC § 1311.04 is required by the owner before any work begins. It must be recorded with the County Recorder and posted on the jobsite. Failing to record one strips the owner of important procedural protections under Ohio's mechanics' lien law. Required for most non-residential improvements and for residential improvements where the owner wants the protections of Ohio's mechanics' lien statute. The owner, part owner, or lessee is required to record and post the Notice of Commencement before work begins. Before any actual physical work or labor begins on the project. With the County Recorder in the county where the property is located.