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Montana mechanics lien deadlines for contractors

A plain-English summary of how a contractor, subcontractor or supplier protects payment with a mechanics lien in Montana. Last checked 2026-10-05. This is general information, not legal advice. Verify with your attorney before you rely on any deadline.

The rules at a glance

  • Who: anyone furnishing services/materials under real estate improvement contract (MCA 71-3-523)
  • NTO: notice of right to claim lien within 20 days of first furnishing (45 days for regulated-lender work not owner-occupied residence) (71-3-531). NOC: none (owner may file notice of completion, 71-3-533)
  • Claim: 90 days after final furnishing/notice of completion (71-3-535). Foreclosure: 2 years from filing (71-3-562)
  • Waiver forms: none. Residential: owner-occupied exception 71-3-531(4)

Source and last verified

Official source: https://mca.legmt.gov/bills/mca/title_0710/chapter_0030/part_0050/sections_index.html. Last verified 2026-10-05. Deadlines often differ for residential and commercial projects and change when the law changes. Verify with your attorney.

How BossHours helps

BossHours loads state rules into the app and shows a verify-with-your-attorney note beside each one, so notices and waivers are prepared from your job records. It does not give legal advice.

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Montana mechanics lien deadlines for contractors