How to File a Mechanic's Lien in Missouri (Step-by-Step)

This guide is a focused, step-by-step walkthrough of the filing process itself. It assumes you already know you have lien rights under Chapter 429 of the Revised Statutes of Missouri. Filing the lien is only the first half of the job: a filed lien preserves your secured claim, but you still have to enforce it by lawsuit within another six months under RSMo § 429.170. Treat the steps below as a sequence — each one has to be done correctly, and in order, or the whole claim can fail.

Step-by-step: filing your mechanic's lien

Step 1: Confirm you can file and identify the property

First, confirm you actually furnished labor or materials that were incorporated into a specific real property improvement. Under RSMo § 429.010, contractors, subcontractors, material suppliers, equipment lessors, design professionals, and laborers all may hold lien rights. Speculative deliveries with no connection to a particular job generally do not qualify.

Next, pin down the legal description of the property — not just a street address. You will need the record owner's name and a description sufficient to identify the parcel. Order this from the county recorder or a title company if you do not already have it.

Step 2: Serve the 10-day notice if you are not the owner's direct contractor

If you are a subcontractor, supplier, or anyone without a direct contract with the owner, Missouri requires you to give the owner a 10-day notice before filing. Under RSMo § 429.100, you must serve the owner with notice that you hold a claim and intend to file a lien, at least 10 days before filing. This gives the owner the chance to withhold funds from the general contractor.

This notice is a frequent point of failure. Serve it in writing, keep proof of service, and count the 10 days carefully. General contractors in direct privity with the owner are typically excused from this step, but confirm your role before assuming you are.

Step 3: Serve the residential consumer notice if it applies

If the work is on owner-occupied residential property, Missouri imposes an additional notice under RSMo § 429.012. This consumer-protection notice must be given to the owner in the exact statutory form, including the prescribed warning language, and at the time the statute requires.

Residential property is generally a building of four or fewer dwelling units. Missouri courts strictly enforce both the form and the timing — wrong language, a missing element, or late service has been held fatal to the lien. If you do residential work, this is the single highest-risk step, so get the form right.

Step 4: Prepare the "just and true account"

The heart of the filing is the just and true account of your demand — a sworn, itemized statement of the labor and materials you furnished and the amount due and unpaid. Under RSMo § 429.080, this account must be verified under oath by you or an authorized representative.

Do not pad or estimate. If the account is materially inflated or inaccurate, the owner can attack it as not "just and true," and a Missouri court can void the entire lien — not just the disputed portion. Claim exactly what you are owed, itemized clearly, and attach the legal description and the record owner's name.

Step 5: File the lien statement with the circuit clerk

File the completed lien statement with the circuit clerk of the county where the property is located — not the county where your business sits, and not the recorder of deeds. The statement should include the sworn just and true account, the legal description, the owner's name, the amount claimed, and a reference to Chapter 429.

This filing must happen within six months after your last day of furnishing labor or materials under RSMo § 429.080. The clock runs from the date of your actual last work, not the date of your final invoice, and minor punch-list or warranty fixes generally do not reset it. Pay the filing fee, which is typically nominal; many Missouri circuit courts accept electronic filing.

Step 6: Serve a copy on the owner

After filing, promptly serve a copy of the recorded lien statement on the property owner so they have actual knowledge of the claim. Keep dated proof of service in your file — it protects you if the validity of the lien is later contested.

What to include in the lien statement

A complete Missouri mechanic's lien statement generally contains:

• A sworn, itemized account of labor and materials and the amount due
• The legal description of the property being improved
• The name of the record owner of the property
• The total amount claimed, matching the itemized account
• A statement that the lien is filed under Chapter 429 of the Revised Statutes of Missouri
• The claimant's verification under oath

Missing or defective elements are a common ground for owners to challenge the lien, so review each item against the statute before filing.

Common mistakes that void a lien

• Filing late. A lien filed even one day past the six-month window under RSMo § 429.080 is void, with no equitable exception.
• Measuring from the invoice date. The six months run from your last day of actual work, not your final billing.
• Skipping a required notice. Missing the 10-day notice (RSMo § 429.100) or the residential consumer notice (RSMo § 429.012) can be fatal.
• Padding the account. An inflated "just and true account" can void the whole lien, not just the overstated part.
• Wrong office or county. File with the circuit clerk in the county where the property sits.
• Forgetting enforcement. Filing is not the end — you must sue to enforce within six months under RSMo § 429.170.

Frequently Asked Questions