# Montana — Mechanics lien filing deadlines, preliminary notice requirements, and enforcement windows by US state and party role

For Montana, preliminary notice required is conditional — required for subcontractors on residential projects (1-4 units) and non-commercial improvements; not required for GCs, commercial improvements, buildings for 5+ families, or laborers; notice name is Notice of Right to Claim a Construction Lien; notice deadline — gc (days) is not required; notice deadline — sub/supplier (days) is 20 days after first furnishing (or 45 days if funded by regulated lender and not owner's residence); lien recording deadline — gc (days) is 90, recorded from its source on 2026-08-14.

- **State:** Montana _(verified: appears in the quote below)_
- **Preliminary notice required:** conditional — required for subcontractors on residential projects (1-4 units) and non-commercial improvements; not required for GCs, commercial improvements, buildings for 5+ families, or laborers _(our reading, not quoted from the source)_
- **Notice name:** Notice of Right to Claim a Construction Lien
- **Notice deadline — GC (days):** not required _(verified: appears in the quote below)_
- **Notice deadline — sub/supplier (days):** 20 days after first furnishing (or 45 days if funded by regulated lender and not owner's residence)
- **Lien recording deadline — GC (days):** 90 _(verified: appears in the quote below)_
- **Lien recording deadline — sub/supplier (days):** 90 _(verified: appears in the quote below)_
- **Enforcement deadline (days):** 730
- **Late notice consequence:** partial — A late notice does not kill the lien, it shrinks it. The lien then reaches only what you furnished in the 20 days before the notice was served, plus everything after _(our reading, not quoted from the source)_
- **Statute:** Montana Rev. Code §71-3-501 et seq. _(verified: appears in the quote below)_

## What the source says

> Montana Rev. Code §71-3-501 et seq. — Private Works, Payment Bonds & Public Projects <https://app.mechanicslien.com/?mode=sign-up> Create Your Account <https://www.mechanicslien.com/get-help/montana> File a Claim <tel:+18004327799> Call (800) 432-7799 Free MT Deadline Calculator Calculate your Montana deadlines and get a free consultation. Montana mechanic lien deadline table with toggles for project type and claimant type. Montana Preliminary Notice & Mechanic Lien Deadlines Select your project type and role to see the deadlines that apply to you. Project Type Private Projects Public Works Property Classification Select Your Tier Prime Contractor Subcontractors & Suppliers Remote Claimants Laborers & Wage Earners Prime Contractor — In direct contract with the property owner, including an architect, engineer, or surveyor the owner hired directly Preliminary Notice Mechanic Lien Enforcement Not Required 90

## Source

- https://mechanicslien.com/montana

Last verified: 2026-08-14. Review by: 2027-08-14.
Part of [Mechanics lien filing deadlines, preliminary notice requirements, and enforcement windows by US state and party role](https://referencesource.org/mechanics-lien-deadlines-by-state/).