Construction Document Management in Missouri

Missouri Original Contractor Notice (RSMo § 429.012)

Original (prime) contractors in Missouri must provide an upfront disclosure. Under RSMo § 429.012, an original contractor must provide the property owner with a specific, statutorily mandated written notice prior to receiving payment in any form or prior to commencing work. The notice must be in at least ten-point bold type and must contain specific disclosure language warning the owner that failure to pay those supplying materials or services may result in a lien against the property.

What the Notice Must Say

Under RSMo § 429.012.1, the notice must state substantially the following:

> "Failure of the owner to pay the contractor, or failure of the contractor to pay subcontractors, material suppliers, or laborers, may result in a mechanic's lien being placed against the property."

The notice must be delivered personally or by certified mail. There is no statutory form, but the exact disclosure language must be used. Missouri courts have been strict in requiring exact compliance with the notice requirement.

What Happens If You Miss the Notice

RSMo § 429.012 makes the notice a condition precedent to the creation, existence, or validity of any mechanic's lien in favor of the original contractor. Missouri courts have denied mechanics liens solely because the original contractor failed to comply with the notice requirement. The Missouri Court of Appeals has held that failure to provide the notice removes the trial court's authority to enforce the lien.

Documenting that this notice was delivered prior to work commencing is critical. Using MyCrewTracker's Quick Docs and Daily Reports, field supervisors generate an instant, verifiable log of when work began, ensuring the back office can definitively prove the notice preceded the commencement of work.

Missouri Notice of Intent to File Lien (RSMo § 429.100)

For subcontractors, Missouri requires a pre-filing warning. Under RSMo § 429.100, every person except the original contractor who may wish to avail themselves of the benefit of the mechanics lien law must give 10 days' notice before filing the lien with the circuit clerk.

This 10-day notice is a strict prerequisite to the lien right itself. Missouri courts have held that a subcontractor or material supplier who fails to prove that notice was given 10 days prior to filing the lien cannot enforce the lien.

How to Serve the Notice

The notice must be given to the owner or the owner's agent, as specified in the statute. The statute does not require the owner's agent to be an agent authorized to accept service of process, nor does it seem to use the term "agent" in the technical legal sense — any person acting on the owner's behalf may receive the notice. The notice is effective whether given to the owner or to the owner's agent.

To defend against claims of invalid liens, contractors must maintain flawless documentation of delivery. MyCrewTracker offers a secure cloud repository where Missouri contractors can organize dated certified mail receipts and formal communications to prove statutory compliance.

Missouri Lien Deadlines at a Glance

Missing a single deadline in Missouri can void your lien rights entirely. The table below summarizes the statutory deadlines every Missouri contractor, subcontractor, and material supplier must track.

How to File a Mechanics Lien in Missouri: Step by Step

The process below reflects the standard path for a Missouri contractor, subcontractor, or material supplier seeking to preserve and enforce lien rights under Chapter 429 of the Missouri Revised Statutes.

1. Log your first day of work. For original contractors, the notice must be delivered before work begins. For subcontractors, the 10-day Notice of Intent clock starts when you decide to file a lien. MyCrewTracker's Daily Reports timestamp this automatically.

2. Serve the Original Contractor Notice (prime contractors only). Under RSMo § 429.012, deliver the statutorily required written notice to the owner prior to commencing work or receiving any payment. The notice must be in ten-point bold type.

3. Serve the 10-Day Notice of Intent (subcontractors only). Under RSMo § 429.100, give written notice to the owner or the owner's agent at least 10 days before filing the lien with the circuit clerk.

4. Track the last day of work. Missouri's 6-month filing clock starts from the last date you furnished labor or materials to the project.

5. Prepare the mechanic's lien statement. Under RSMo § 429.080, the statement must be a just and true account of the demand due, after allowing all credits, and must be verified by affidavit.

6. File the lien statement with the Circuit Clerk. Missouri mechanics liens are filed at the county level, not the state. File in the office of the circuit clerk in the county where the property is located.

7. File suit to enforce within 6 months. Under RSMo § 429.310, an action to enforce the lien must be commenced within 6 months after the lien statement is filed with the circuit clerk.

8. Record a notice of lis pendens. When you file suit, record a notice of pendency of action to protect priority.

9. Preserve all project documentation. Daily reports, delivery tickets, change orders, and photos become evidence in the foreclosure action.

Documents to Preserve for a Missouri Lien Claim

Missouri courts require proof that you furnished labor or materials and that they were incorporated into the property. The following records are what you need:

• Signed contract or purchase order with the prime contractor
• Certified mail receipts for the Original Contractor Notice
• Certified mail receipts for the 10-Day Notice of Intent
• Delivery tickets signed by an authorized site representative
• Daily reports showing crew on site and work performed
• Photo evidence of installed work (timestamped and geotagged)
• Jobsite sign-in logs and crew attendance records
• Invoices, statements, and payment applications
• Email or text correspondence about scope and payment
• Change orders and extra work authorizations
• Written demand letters and any response

MyCrewTracker stores all of these in one project record. When a lien deadline approaches, the back office can generate the timeline needed to prepare the lien statement without reconstructing months of field activity.

Missouri-Specific Gotchas

The Original Contractor Notice is a condition precedent. Missouri courts have consistently held that failure to provide the statutory notice forfeits the original contractor's lien rights entirely. There is no mechanism to cure a missed notice. The notice must be delivered before work begins or before any payment is received.

The 10-day Notice of Intent is strict. Under RSMo § 429.100, subcontractors must give the owner exactly 10 days notice before filing the lien. Missouri courts have held that failure to prove this notice was given defeats the lien.

The 6-month filing deadline is absolute. RSMo § 429.080 gives you exactly 6 months from your last day of work to file the lien statement with the circuit clerk. There are no extensions.

The 6-month enforcement deadline is absolute. RSMo § 429.310 gives you exactly 6 months from filing the lien statement to commence an action to enforce it. Set two calendar reminders: one at 4 months, one at 5 months.

Advance lien waivers are void. Under RSMo § 429.005, a contractor may not waive its right to enforce or claim any lien in an agreement that is in anticipation of and in consideration for the awarding of a contract. Any such provision is void and unenforceable. However, you may waive lien rights for work already performed in exchange for payment.

Prompt Payment Act applies to public projects. The Missouri Public Prompt Payment Act (RSMo § 34.057) requires public owners to make progress payments to contractors and provides for prompt payment by the contractor to subcontractors and material suppliers.

Construction defect statute of repose. Missouri's statute of repose for construction defects is 10 years from the date the improvement is completed under RSMo § 516.097. This applies to architects, engineers, and builders. Retain project records for at least 10 years.

Example Scenario: How Documentation Determines the Outcome

*The following is an illustrative scenario, not a specific case. It demonstrates how record-keeping affects outcomes in Missouri lien disputes.*

Consider a Kansas City mechanical subcontractor on a $500,000 commercial office renovation. The sub is not the original contractor. The sub's last day of substantial work is August 15.

Under RSMo § 429.100, the sub must give the owner 10 days' notice before filing a lien. The sub sends the Notice of Intent via certified mail on November 1. The 10-day period expires on November 11. The sub files the mechanic's lien with the Jackson County Circuit Clerk on November 15.

Under RSMo § 429.080, the sub must file the lien statement within 6 months of the last day of work. The sub filed on November 15 — well within the February 15 deadline.

Under RSMo § 429.310, the sub must file suit to enforce the lien within 6 months of filing the lien statement. That deadline is May 15 of the following year. The sub files suit on March 15, well within the window. The lien is enforceable.

Now consider the same sub who skips the 10-Day Notice of Intent and files the lien directly. Under RSMo § 429.100, the lien is void entirely. Missouri courts have held that the notice is a strict prerequisite to the lien right.

Documentation is what separates these outcomes. MyCrewTracker logs the last day of work, the notice service date, the filing date, and the daily reports that prove performance.

Missouri Prompt Payment Act (RSMo § 34.057)

For public works projects, Missouri law establishes statutory payment cycles under the Missouri Public Prompt Payment Act. Under RSMo § 34.057, all public works contracts made by a political subdivision must provide for prompt payment by the public owner to the contractor, as well as prompt payment by the contractor to the subcontractor and material supplier.

What the Missouri Prompt Payment Act Covers

• Public owners must make progress payments to contractors in accordance with the contract terms
• Contractors must promptly pay subcontractors and material suppliers
• Retainage is limited, and public owners may withhold payment only for specific reasons such as unsatisfactory job progress, defective construction, or disputed work
• Interest penalties may apply for late payments

For private projects, Missouri courts have recognized a "Private Prompt Pay Act" under RSMo § 431.180, which authorizes a prevailing party to collect attorney's fees and interest when payments are not made in accordance with a contract for private design and construction work.

To enforce these rights, contractors must maintain flawless documentation of when invoices were transmitted and received. MyCrewTracker offers a secure cloud repository where Missouri contractors can organize dated payment applications and formal communications.

Missouri Lien Waivers (RSMo § 429.005)

Missouri law voids pre-contract lien waiver provisions. Under RSMo § 429.005, a contractor may not waive its right to enforce or claim any lien in an agreement that is in anticipation of and in consideration for the awarding of a contract. Any such provision is void and unenforceable.

However, Missouri law allows a claimant to waive lien rights for work already performed. A partial or full waiver of mechanic's lien rights is enforceable if it is an unconditional waiver executed in exchange for payment.

What This Means for Missouri Contractors

• You cannot be forced to waive all lien rights before work begins
• You can sign a partial waiver when you receive a progress payment
• The waiver is only effective for the payment you actually received
• Unconditional waivers are enforceable immediately upon signing

What MyCrewTracker Does (and Does Not Do) in Missouri

MyCrewTracker is a construction documentation platform, not a legal service. Here is what it does for Missouri contractors:

• Logs first day and last day of work per project so you can calculate the 10-day Notice of Intent and the 6-month filing window
• Stores certified mail receipts and Original Contractor Notice documents in the project file
• Records delivery tickets with photo and signature capture
• Captures timestamped, GPS-tagged site photos that document installation
• Generates daily report PDFs that serve as contemporaneous records
• Tracks payment application dates for Prompt Payment Act compliance
• Archives project records for 10+ years to support construction defect defense

It does not draft Original Contractor Notices or Notices of Intent, file mechanic's liens with the circuit clerk, or provide legal advice. Those steps require a Missouri construction attorney.