A working guide for Iowa general contractors, subcontractors, suppliers, owners, and lenders on how the Mechanic’s Notice and Lien Registry actually works: what gets filed, by whom, and by when. Miss a deadline and you don’t keep your lien rights. Period.
Iowa’s mechanic’s lien practice runs through a single online filing system: the Mechanic’s Notice and Lien Registry, or MNLR, maintained by the Iowa Secretary of State. Iowa moved most of this practice off paper and out of the county recorder’s office in 2012, and the system has been the central plumbing of Iowa construction lien law ever since.
The procedural rules look straightforward in outline. They are punishing in practice. The Iowa Code is specific about what gets filed, who has to file it, and by when, and the deadlines are short, the consequences for missing them are not curable, and the procedural distinctions between commercial and residential projects can catch out-of-state contractors and even Iowa contractors who don’t work residential often. This piece walks through the core rules every Iowa contractor, supplier, owner, and lender should know.
For broader context on Iowa real estate transactions generally, see our post on Iowa commercial real estate conveyancing.
What the MNLR Is
The Mechanic’s Notice and Lien Registry is a statewide electronic registry where mechanic’s lien notices and filings are posted. It is administered by the Office of the Iowa Secretary of State at sos.iowa.gov. Postings on the MNLR are publicly searchable by property owner, by general contractor, and by parcel, and they create the official record of lien-related notices for any project covered by the registry.
Filing fees are modest, $7 for an electronic submission and $10 for a fax or mailed submission as of this writing, and the procedural mechanics are designed to be accessible without a lawyer. What’s not modest is the consequence of missing a filing window. Iowa’s mechanic’s lien framework is procedurally specific, and the Code is unforgiving about lapsed deadlines.
The procedural rules look straightforward in outline. They are punishing in practice.
The Notice of Commencement: What General Contractors Must File
Iowa Code §572.13A requires a general contractor to post a Notice of Commencement of Work on the MNLR within 10 days of the commencement of work on a residential project. The notice must include the name and address of the owner, the name, address, and telephone number of the general contractor or owner-builder, the legal description of the property, the date work commenced, and the tax parcel identification number.
The consequence of failing to post the Notice of Commencement is significant: the general contractor loses lien rights and the remedies otherwise available under Iowa Code §572.13A(4). A GC who skips the filing because the project felt small, or because the owner asked them not to, or because nobody got around to it, has given up the legal mechanism that would otherwise protect their right to be paid.
The Notice of Commencement also serves another purpose. It is the anchor record on the MNLR that subcontractors and suppliers reference when filing their own preliminary notices. Without a posted Notice of Commencement, the project’s MNLR record doesn’t exist for the people who need to file against it.
Preliminary Notice: What Subcontractors and Suppliers Must File
Subcontractors and suppliers on residential projects face their own filing requirement. Under Iowa Code §572.13B, a subcontractor or supplier furnishing labor, service, equipment, or material to a residential construction project must post a preliminary notice on the MNLR, and that notice must be posted before the balance due is paid to the general contractor or owner-builder.
The preliminary notice must include the name of the owner, the MNLR number for the project, the legal description of the property, and the date materials were first furnished or labor was first performed.
A subcontractor or supplier who fails to post the preliminary notice in time loses their right to a mechanic’s lien against the property, and loses the leverage that lien rights provide in any payment dispute. The owner’s payment to the general contractor effectively cuts off the sub’s lien rights against the property, even if the GC then fails to pay the sub. This is one of the most common ways subs and suppliers lose otherwise valid claims, and it’s almost always preventable.
The 90-Day Window
For both residential and commercial projects, the deadline that matters most is 90 days after the last day labor was performed or materials were furnished. A mechanic’s lien posted on the MNLR within that window carries full priority. Under Iowa Code §572.18, it is superior to every other lien on the property except liens of record before the claimant’s work began and a construction mortgage recorded before the claimant started work. That priority is what makes a timely lien worth something.
The statute does allow a late lien, but a late lien is a much weaker instrument. Under Iowa Code §572.9, the statement of account can be posted up to two years and 90 days after the last labor or material, and §572.10 permits a lien posted after the 90th day if the claimant also serves written notice on the owner in the manner an original notice is served. The catch is §572.11: a late lien is enforceable against the property only to the extent of the balance the owner still owes the general contractor when that notice is served. If the owner has already paid the GC in full, the late lien attaches to nothing. And it loses the §572.18 priority a timely lien enjoys.
For commercial projects, the 90-day window is the principal deadline a contractor or supplier needs to track. There is no Notice of Commencement requirement on commercial projects, and there is no separate preliminary notice requirement for commercial subs and suppliers; the procedural framework is lighter on the front end, but the 90-day window carries the same weight it does on residential projects. Treat the 90th day as the real deadline. The outer limit of two years and 90 days is a fallback for a claim that has already lost most of its leverage.
Commercial vs. Residential: A Critical Distinction
Iowa’s mechanic’s lien framework treats commercial and residential projects differently in ways that catch unwary contractors:
| Filing | Residential | Commercial |
|---|---|---|
| Notice of Commencement (general contractor) | Required within 10 days of starting work | Not required |
| Preliminary notice (subcontractors and suppliers) | Required before the owner’s payment to the GC | Not required |
| Lien filing | Within 90 days of last work for full priority; a later lien needs owner notice and reaches only what the owner still owes the GC | Within 90 days of last work for full priority; a later lien needs owner notice and reaches only what the owner still owes the GC |
| Owner payment defense | Owner’s payment to the GC cuts off lien rights of subs who did not file a preliminary notice | More limited; the owner’s payment generally does not cut off properly preserved lien rights |
The residential framework is structured to give the owner certainty about who can claim against their property. Once the owner has paid the GC and no preliminary notice is on file, lien rights are effectively cut off. The commercial framework gives subs and suppliers more time and fewer procedural hoops, but the priority and the substantive lien analysis can be more contested.
Common Mistakes That Cost Contractors Lien Rights
The mistakes we see most often:
GCs not filing the Notice of Commencement on residential projects. The 10-day window is short and easily missed when work starts before the paperwork catches up.
Subs not filing preliminary notice before final payment. A sub who shows up at the end of a job to claim payment, only to learn the owner has already paid the GC, has often lost their lien rights without realizing it.
Out-of-state contractors applying their home state’s framework. Mechanic’s lien procedure varies meaningfully by state. Texas, Illinois, and Minnesota each have their own deadlines, notice requirements, and forms, none of which are a substitute for Iowa’s.
Filing on the wrong project record. If the Notice of Commencement was filed by an owner-builder using a slightly different name or parcel description, a sub’s preliminary notice filed against the more obvious record can fail to attach.
Treating the 90-day deadline as if last-work disputes are negotiable. When the last day of work is contested (was it the punch list? the warranty visit? the change order work?), the 90-day clock is decided by the substantive facts, not by what the contractor wishes it were.
What Owners and Lenders Need to Know
For owners, the system gives meaningful payment-defense leverage if it’s used. Pay the GC against a no-preliminary-notice posture on the MNLR and most residential sub claims are extinguished. But that defense only works if you actually check the MNLR before you cut the final check.
For lenders, mechanic’s lien priority is one of the load-bearing issues in any commercial construction loan. The mortgage’s recording date matters; the date construction commenced matters; the relationship between the lien priority statute and the mortgage’s first-priority position matters. We coordinate the loan documents and the MNLR record to manage that risk through the construction period; see our commercial loan documents practice page and our construction law specialty page for more on how this work is structured.
Working With Our Firm
If you’re a contractor wondering whether your lien rights are still alive, an owner trying to defend against a lien filed against your property, or a lender working through a construction loan with priority concerns, we’d be glad to talk. Construction matters are time-sensitive; the MNLR’s filing windows run regardless of whether the parties are talking, and early engagement protects rights that may otherwise be lost.
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This article is provided for general informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship. If you have questions about a specific matter, please contact our office.
