Contractors, suppliers, laborers, and tradespeople who have a lien against property in Montana must file their lien within 90 days after the date on which they last furnished labor, services or materials. Lien statements must be verified.
A Notice of Right to Claim Lien must be recorded for construction projects involving single family homes, duplexes, triplexes and 4-plexes. It's a good idea to file a Notice of Right to Claim Lien for any private works done in Montana.