A Notice to Owner is a document that is sent to the owner of a project by any party that does not have a contract with the owner. It should also be sent to the general contractor on the project, and to any lender that is identified in a Notice of Commencement. The document is important to ensure that a subcontractor gets paid for labor or materials that it furnishes to a project. It usually must be served on the owner within 45 days of the date that materials are delivered or work is first performed on a project – the failure to abide by that deadline will result in the inability to record a lien for any work that is not paid for.