In Missouri, subcontractors, material suppliers, and laborers who never signed a contract directly with the property owner still generally have mechanic's lien rights under Chapter 429 of the Revised Statutes of Missouri. These are derivative lien rights — they flow from the labor or materials you actually furnished for the improvement, not from any agreement with the owner. The single most important difference for you as a subcontractor is the 10-day notice you must serve on the owner before filing, under RSMo § 429.100.
If you supplied work or materials through a general contractor and you haven't been paid, the lien attaches to the property itself rather than to the contractor who stiffed you. But subcontractor liens are the highest-risk category in Missouri practice. You must serve the right notice, file a just and true account, hit the six-month filing deadline under RSMo § 429.080, and then sue to enforce within another six months under RSMo § 429.170. Miss any step and the secured claim disappears.
Do subcontractors have lien rights without an owner contract?
Yes. RSMo § 429.010 extends lien rights to a broad range of parties who contribute to a real property improvement, including subcontractors who contract with a general contractor (or another subcontractor), material suppliers, equipment lessors, and laborers. You do not need privity — a direct contractual relationship — with the owner.
The work or materials must actually be incorporated into, or specifically fabricated for, the improvement of a particular property. A drywall sub who hangs board in a specific building has lien rights; a supplier filling generic inventory orders without knowing which job the materials will reach generally does not.
Because your rights are derivative, your lien is generally limited to the value you furnished. You cannot claim more than the reasonable value of your labor and materials, and in some situations recovery is constrained by what the owner still owes up the chain. Claim exactly what you are owed — no more.
The 10-day notice every subcontractor must serve
This is the step subcontractors miss most often. Under RSMo § 429.100, a subcontractor or supplier who lacks a direct contract with the owner must serve the owner with written notice at least 10 days before filing the lien. The notice states the amount claimed and from whom it is due, and it gives the owner the chance to withhold that amount from the general contractor before paying it out.
Why does this matter so much for subs? Because the owner has no contract with you, the law requires you to put the owner on notice that an unpaid downstream claim exists. Missouri courts strictly enforce the notice's form, content, and timing — serving it nine days before filing, or omitting required information, can defeat the lien. Serve it personally or by certified mail with return receipt, and keep proof.
The residential 10-day notice of intent
Separately, for residential property — generally a building of four or fewer dwelling units — Missouri requires every lien claimant to serve a notice of intent to file a mechanic's lien at least 10 days before filing, in the exact statutory form prescribed by RSMo § 429.012, including the bolded warning language. If your project is residential, you may need to satisfy both this consumer-protection notice and the § 429.100 subcontractor notice. Treat them as separate requirements and confirm which apply to your job.
The just and true account requirement
Every Missouri mechanic's lien filing must include a just and true account — a sworn, itemized statement of the labor and materials you furnished and the amount due and unpaid, verified under oath, with a legal description of the property. This requirement, rooted in RSMo § 429.080, applies to subcontractors just as it does to general contractors.
Owners frequently attack subcontractor accounts as padded or inaccurate. If a Missouri court finds the account materially wrong, it can void the entire lien, not just the disputed line items. Itemize carefully and do not inflate the total.
The deadlines: six months, then six months again
Missouri's lien deadlines are strict statutes of limitation with no "substantial compliance" forgiveness. A lien filed one day late is void.
- File the lien statement within six months of the last date you actually furnished labor or materials, under RSMo § 429.080. The clock runs from your last day of real work — not from your final invoice date. Minor punch-list or warranty fixes generally do not reset it.
- File suit to enforce within six months of filing the lien, under RSMo § 429.170. A filed lien is not self-executing; if you don't sue in time, the lien expires automatically.
From your last day of work you have, at most, roughly twelve months to both file and enforce — treat those as absolute outer limits.
A worked example
Suppose you're an electrical subcontractor. You wired a four-unit apartment building for a general contractor, finished your last day of work on March 1, invoiced $40,000, and were never paid.
- Because the building is residential, you serve both the RSMo § 429.012 notice of intent in the exact statutory form and the RSMo § 429.100 subcontractor notice, at least 10 days before filing.
- You prepare your just and true account — itemized, verified under oath, with the legal description.
- You file the lien statement in the property's county circuit court, well before your September 1 deadline.
- If the owner still doesn't pay, you file your enforcement lawsuit within six months of the lien filing.
Had you waited until September 2 to file, your lien would be void — leaving only an unsecured contract claim against the contractor.
Step-by-step: what a subcontractor should do
- Track your last day of work precisely. Your six-month clock starts there.
- Identify the property type. Residential (four or fewer units) triggers the § 429.012 notice; subcontractor status triggers the § 429.100 notice.
- Serve required notices at least 10 days before filing , by certified mail with return receipt, and keep proof.
- Prepare a just and true account — itemized, accurate, sworn, with a legal description.
- File the lien statement in the correct circuit court before the deadline.
- Serve a copy of the lien on the owner promptly after filing.
- File suit to enforce within six months of filing if payment doesn't arrive.
The double-payment problem and how it's managed
Subcontractor liens create the double-payment risk: an owner who pays the general contractor in full can still face liens from unpaid subs and suppliers, effectively paying twice. Owners manage this by demanding conditional and unconditional lien waivers at every progress payment and by issuing joint checks payable to both the contractor and the sub or supplier.
For priority, Missouri uses a relation-back rule: liens generally relate back to the date work first commenced, which can place them ahead of a later-recorded mortgage. General contractors, subcontractors, and suppliers on the same improvement generally share one class of priority rather than competing by filing date.
Frequently Asked Questions
Do I need a contract with the owner to file a lien as a subcontractor?
No. Under RSMo § 429.010, subcontractors, suppliers, and laborers have derivative lien rights based on the labor or materials they furnished, even without privity with the owner. You must, however, serve the owner the required 10-day notice under RSMo § 429.100 before filing.
What is the 10-day subcontractor notice?
It is a written notice you must serve on the owner at least 10 days before filing, stating the amount due and from whom, under RSMo § 429.100. It lets the owner withhold that amount from the general contractor, and Missouri courts strictly enforce its form and timing.
How long do I have to file my subcontractor lien?
You must file the lien statement within six months of the last date you furnished labor or materials, under RSMo § 429.080. The clock runs from your last actual work, not your final invoice, and punch-list work generally does not reset it.
Can a subcontractor lien if the owner already paid the general contractor?
Possibly. Missouri's double-payment problem means an owner who paid the general contractor in full, without obtaining lien waivers, can still face liens from unpaid subs and suppliers. This is why prudent owners demand lien waivers and use joint checks.
How much can I claim on a subcontractor lien?
Your lien is generally limited to the reasonable value of the labor and materials you actually furnished, and in some situations to what the owner still owes up the chain. Padding the account can void the entire lien, so claim only what you are owed.
What happens if I miss the deadline?
Your secured lien rights are extinguished with no equitable exceptions. You still have your underlying contract claim against whoever owes you, but you lose the secured claim against the property and your priority position.
Legal Disclaimer
This guide provides general legal information about Missouri law. It is not legal advice and does not create an attorney-client relationship. Missouri mechanic's lien law involves strict procedural requirements with severe consequences for missed deadlines and notices; consult with a qualified Missouri attorney about your specific situation before filing or contesting a lien.