A Missouri mechanics lien lets a contractor, subcontractor, equipment renter, or material supplier attach an unpaid construction debt directly to the property they improved, clouding the title until the debt is paid or the lien expires. The rules live in Sections 429.010 through 429.340 of the Missouri Revised Statutes, and they are unforgiving on deadlines: miss the six-month filing window or the six-month enforcement window and the claim is gone.
Who Can Claim a Lien
Missouri lets almost anyone in the construction payment chain file. That includes general contractors, subcontractors, day laborers, equipment rental companies, material suppliers, and nurseries that install landscaping, provided the work was done under a contract with the owner, the owner’s agent, a general contractor, or a subcontractor.1Missouri Revisor of Statutes. Missouri Code 429.010 – Mechanics and Materialmen’s Lien, Who May Assert, Extent of Lien
One boundary matters up front. Mechanics liens do not attach to publicly owned property used for a public purpose. If you worked on a school, a municipal building, or another government project, your remedy is a payment bond claim, covered below.
The Written Disclosure a General Contractor Must Give the Owner
Before work begins, a general contractor has to hand the property owner a written notice explaining that unpaid subs and suppliers can lien the property, and warning the owner to collect lien waivers to avoid paying twice. The exact statutory language is required.2Missouri Revisor of Statutes. Missouri Code 429.012 – Notice to Owner
This is not a paperwork technicality. A GC who skips the notice with intent to defraud commits a class B misdemeanor, and any contractor who knowingly issues a fraudulent lien waiver or false affidavit faces a class D felony.2Missouri Revisor of Statutes. Missouri Code 429.012 – Notice to Owner
The Ten-Day Notice for Subcontractors and Suppliers
General contractors can go straight to filing. Everyone else has an extra step. Section 429.100 requires any person other than the original contractor to deliver a written notice to the property owner at least ten days before filing the lien. The notice must state the amount claimed and identify who owes the money.3Missouri Revisor of Statutes. Missouri Code 429.100 – Notification by Subcontractors and Others
Service can be made by any officer authorized to serve civil process or by any competent witness. An officer’s return endorsement proves service; anyone else must sign an affidavit confirming delivery.3Missouri Revisor of Statutes. Missouri Code 429.100 – Notification by Subcontractors and Others Keep copies. If the owner later argues you never gave proper notice, your file is what saves the lien.
Filing the Lien Statement
The lien statement goes to the clerk of the circuit court in the county where the property sits. Under Section 429.080, it must contain a verified account of the amount owed after all credits, a description of the property sufficient to identify it, and the name of the owner or contractor if known. The claimant, or a credible person on the claimant’s behalf, must swear to it under oath.4Missouri Revisor of Statutes. Missouri Code 429.080 – Lien Filed With Circuit Clerk, When
The deadline is six months after the indebtedness accrues, which generally means six months after the last day of work or last delivery of materials. Equipment rental companies have a different clock: sixty days after the rented equipment was last removed from the property.4Missouri Revisor of Statutes. Missouri Code 429.080 – Lien Filed With Circuit Clerk, When There is no extension.
A few points on drafting the statement:
- State only what you are actually owed after credits. Inflated figures invite a challenge that can sink the whole lien.
- The statute allows “a true description of the property, or so near as to identify the same.” A full legal description from the deed is safest; a street address with a parcel number is often enough.
- The sworn oath requirement means you will typically need a notary. An unsworn statement is defective.
Enforcing the Lien in Court
Filing the lien statement is only half the job. Section 429.170 says no lien lasts more than six months after filing unless a lawsuit to enforce it is filed within that period, and the suit must be “prosecuted without unnecessary delay to final judgment.”5Missouri Revisor of Statutes. Missouri Code 429.170 – All Actions Commenced Within Six Months You cannot file suit just to preserve the lien and let it sit.
The enforcement action is a foreclosure suit in the circuit court where the property is located. The owner is served with a summons and petition; if the court finds the lien valid, it can order the property sold to satisfy the debt. What you actually recover depends on what you prove is owed and where your lien sits in the priority order.
Where a Missouri Lien Sits in Line
Missouri mechanics liens outrank most later claims on the property. Section 429.060 gives a mechanics lien priority over every encumbrance that attaches after the building or improvement commenced.6Missouri Revisor of Statutes. Missouri Code 429.060 – Lien Shall Have Precedence Over Subsequent Encumbrances The controlling date is when visible work first began on the ground with the intent to complete the improvement, not when any individual claimant showed up.
This “relation back” rule works in both directions. A subcontractor who joined the job months after groundbreaking still shares in that early priority date. But a construction loan mortgage recorded before work started will generally sit ahead of the mechanics liens in the payout order.
Public Projects: Payment Bond Claims Instead
Because liens cannot touch publicly owned property, Missouri substitutes a bond. Section 107.170 requires every public entity to obtain a payment bond from the prime contractor on any public works project with an estimated cost above $50,000. The bond protects those who supply labor, materials, or insurance for the project.7Missouri Revisor of Statutes. Missouri Code 107.170 – Payment Bond Requirements for Public Works
Unpaid subs and suppliers on a bonded public job claim against the surety, not the property. Remote suppliers, meaning those who supplied a second-tier or lower subcontractor or another supplier, must give written notice to the prime contractor within ninety days of their last delivery to preserve the bond claim.7Missouri Revisor of Statutes. Missouri Code 107.170 – Payment Bond Requirements for Public Works
Federal projects in Missouri run on a separate track under the federal Miller Act, which requires payment bonds on contracts above $100,000.8GSA (U.S. General Services Administration). The Miller Act The procedure and deadlines differ, so confirm which set of rules governs before filing anything.
Lien Waivers and the Double-Payment Trap for Owners
Missouri courts have held repeatedly that paying the general contractor in full is not, by itself, a defense against a subcontractor’s lien. If the GC pockets the money and never pays the subs and suppliers, they can lien the property and force the owner to pay again. That is exactly the risk Section 429.012’s disclosure is meant to warn owners about.2Missouri Revisor of Statutes. Missouri Code 429.012 – Notice to Owner
The practical defense is lien waivers. A waiver is a document in which a contractor, sub, or supplier gives up the right to lien for a specified payment. Missouri does not mandate a specific waiver form, but the felony penalty for knowingly issuing a fraudulent waiver applies regardless of form.2Missouri Revisor of Statutes. Missouri Code 429.012 – Notice to Owner
Two categories are used in practice. A conditional waiver takes effect only when the referenced payment actually clears. An unconditional waiver takes effect on signing, whether the check clears or not. For anyone signing, the safer sequence is a conditional waiver at each progress payment, then an unconditional waiver once final payment has posted. For an owner, the discipline that prevents most double-payment problems is collecting waivers from every subcontractor and supplier at every draw, not just from the general contractor.
Defending Against a Mechanics Lien
Owners and other parties facing a lien usually win on procedure. The common defenses:
- Late filing. A lien statement filed more than six months after the indebtedness accrued is void.4Missouri Revisor of Statutes. Missouri Code 429.080 – Lien Filed With Circuit Clerk, When
- Late enforcement. Even a properly filed lien dies if no foreclosure suit is filed within six months of the filing date.5Missouri Revisor of Statutes. Missouri Code 429.170 – All Actions Commenced Within Six Months
- Missing ten-day notice. A subcontractor or supplier lien can be challenged when the pre-filing notice under Section 429.100 was not delivered.3Missouri Revisor of Statutes. Missouri Code 429.100 – Notification by Subcontractors and Others
- Inaccurate statement. Courts expect the sworn account to be “just and true.” A substantially inflated amount or a property description too vague to identify the parcel can void the lien.
- Payment already made. Canceled checks, waivers, and other payment records can defeat the underlying debt claim.
Claimants who abuse the process face their own exposure. Filing a lien known to be false can support a slander of title claim by the owner, and Section 429.012 layers criminal penalties on fraudulent waivers and affidavits.
Releasing a Lien That Has Been Paid
Once the debt is paid, the claimant needs to file a release with the circuit court clerk so the public record shows the property is clear. Section 429.032 covers partial releases when a lien covers multiple parcels: the claimant files an acknowledgment identifying which parcels are being released and the portion of the debt satisfied.9Missouri Revisor of Statutes. Missouri Code 429.032 – Partial Release of Mechanics Lien A full release follows the same route through the clerk’s office.
Sitting on a satisfied lien causes real damage. The owner cannot sell or refinance cleanly, and a claimant who refuses to release after payment invites litigation and potential liability for the owner’s costs. File the release promptly once the payment clears.
If the Owner Files Bankruptcy
A property owner’s bankruptcy triggers an automatic stay under federal law, which halts collection efforts, foreclosure suits included. A lien statement already filed before the bankruptcy petition generally survives; the stay blocks enforcement, not the lien’s existence. Continuing or filing a foreclosure action requires a separate motion for relief from stay in bankruptcy court, which adds time and cost to the process.