What Is a Mechanics Lien in Missouri — Complete 2026 Guide
✓ Verified against Missouri statutes · Reviewed August 2026 · By Michael Evan — Founder · 50 states · 799 rules
Missouri mechanics lien deadlines at a glance
Preliminary Notice
10 days (sub) — Just Notice to Owner
Mechanics Lien
6 months — From last date of furnishing
Enforcement
6 months — From filing
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Missouri's Unique Filing Location — Circuit Court Clerk
Missouri stands out from almost every other state in the country: mechanics liens are filed with the Circuit Court Clerk of the county where the property is located, not with a county recorder of deeds or county clerk. This distinction causes a high rate of invalid filings by contractors unfamiliar with Missouri law. In Kansas City, file with the Jackson County Circuit Court Clerk (16th Judicial Circuit). In suburban St. Louis County, file with the 21st Judicial Circuit Court Clerk. In the City of St. Louis — which is an independent city separate from St. Louis County — file with the 22nd Judicial Circuit Court Clerk. Always verify the correct circuit court for the property address.
Missouri 6-Month Filing Deadline
Under Mo. Rev. Stat. § 429.080, all mechanics lien claimants — original contractors, subcontractors, sub-subcontractors, and material suppliers — have 6 months from the date they last furnished labor or materials to file their lien statement with the Circuit Court Clerk. No preliminary notice is required at any tier in Missouri. This is one of the most accessible aspects of Missouri lien law compared to states like California, Texas, and Florida that require preliminary notices. However, the 6-month filing window is not particularly generous compared to states like New York (8 months) or Vermont (180 days).
Missouri's 6-Month Enforcement Deadline — The Critical Trap
The most dangerous feature of Missouri mechanics lien law is the enforcement deadline. Under Mo. Rev. Stat. § 429.170, a claimant must file a lawsuit to foreclose the lien within just 6 months of the lien filing date. This is one of the shortest enforcement windows of any state with a general mechanics lien statute. Most states give 1–2 years to enforce. Missouri contractors who record a lien for leverage and then spend months in payment negotiations routinely discover that the enforcement window has closed. Set an enforcement deadline reminder the same day the lien is filed — do not let it drift.
No Preliminary Notice Required in Missouri
Missouri does not impose a preliminary notice requirement for any tier in the construction chain. General contractors, subcontractors, and material suppliers can file a mechanics lien in Missouri without first serving any notice on the property owner. This is a significant advantage over states with strict preliminary notice rules. However, subcontractors and suppliers without a direct contract with the owner should serve notice of the recorded lien on the property owner after filing under Mo. Rev. Stat. § 429.100 to protect their interests.
Frequently Asked Questions
Where do I file a mechanics lien in Missouri?
Missouri mechanics liens are filed with the Circuit Court Clerk in the county where the property is located — not the recorder of deeds. In Kansas City, file with the Jackson County Circuit Court Clerk. In St. Louis, verify whether the property is in St. Louis City (22nd Circuit) or St. Louis County (21st Circuit).
How long do I have to file a mechanics lien in Missouri?
All claimants have 6 months from the last date of furnishing labor or materials to file a lien statement under Mo. Rev. Stat. § 429.080.
Is preliminary notice required in Missouri?
No. Missouri does not require any preliminary notice before filing a mechanics lien at any tier.
How long do I have to enforce a Missouri mechanics lien?
Only 6 months from the lien filing date under Mo. Rev. Stat. § 429.170 — one of the shortest enforcement windows in the country.