Iowa Preliminary Notice & the Mechanics' Notice and Lien Registry — Iowa Code §§ 572.13B / 572.13A / 572.33 Guide (2026)
✓ Verified against Iowa statutes · Reviewed August 2026 · By Michael Evan — Founder · 50 states · 799 rules
Iowa mechanics lien deadlines at a glance
Preliminary Notice
Post to MNLR — Mechanics Notice Registry
Mechanics Lien
90 days — From last date of furnishing (post-90)
Enforcement
2 years — From filing
Manage your Iowa deadlines and projects — start free → · All Iowa deadlines & forms
What Is the Iowa Preliminary Notice, and Why It Has No Deadline
The Iowa preliminary notice is the posting a subcontractor makes to the Mechanics' Notice and Lien Registry — the MNLR, a single statewide internet-based database — to preserve mechanic's lien rights under Iowa Code chapter 572. Iowa shares that centralized structure with Utah, and it is a genuine simplification: one place to post, one place to search, no county-by-county recording and no service on a designee named in someone else's instrument. What makes Iowa unlike every other notice state is the deadline, or rather the absence of one. Section 572.13B(1) provides that a preliminary notice posted before the balance due is paid to the general contractor or the owner-builder is effective as to all labor, service, equipment, and material furnished to the property by the subcontractor. There is no twenty-day rule as in California, Michigan, and Utah, no twenty-one-day rule as in Ohio. The trigger is an event in someone else's bank account. That structure is more dangerous than a short deadline, not less. A deadline is visible and can be calendared from a date the claimant knows — its own first day on site. The owner's payment schedule is neither visible nor controllable, and on a residential project funded in a handful of draws the balance due the general contractor can fall to zero within weeks. Meanwhile the moment that naturally prompts a subcontractor to think about lien rights — an invoice aging past sixty days — routinely arrives after the owner has already paid.
Residential Versus Commercial — Two Separate Iowa Regimes
Before anything else, classify the property. Section 572.13B(5) states that the preliminary notice section applies only to residential construction properties. Section 572.33(1) states that its notification requirements apply only to commercial construction. The two regimes differ on every axis, and applying one to the other fails in both directions. On residential work, the duty falls on subcontractors generally — anyone who did not contract directly with the owner — and it is discharged by posting to the MNLR, with the balance-due timing rule. On commercial work, the duty is much narrower. Section 572.33(2) reaches only a person furnishing labor or materials to a subcontractor. That claimant must notify the general contractor or owner-builder in writing, with a one-time notice giving its own name, mailing address, and telephone number and the name of the subcontractor it furnished to, within thirty days of first furnishing labor or materials for which a lien claim may be made. It must then support the lien claim with a certified statement that the notice was given. Additional labor or materials furnished by the same person to the same subcontractor on the same project are covered by the one notice. The most-missed consequence: a first-tier subcontractor working directly for the general contractor on an Iowa commercial job has no preliminary notice obligation whatsoever. Section 572.13B does not reach commercial property and § 572.33 does not reach a subcontractor of the general contractor.
The Notice of Commencement Prerequisite and the Subcontractor's Escape Hatch
A preliminary notice cannot float free on the registry. Section 572.13A(2) provides that a notice of commencement of work must be posted to the MNLR before preliminary notices under § 572.13B may be posted. The notice of commencement is the general contractor's or owner-builder's job on residential property, due no later than ten days after the commencement of work, and it carries its own severe sanction: under § 572.13A(4), a general contractor who fails to post it is not entitled to a lien or remedy under chapter 572. It is also effective only as to labor, service, equipment, or material furnished after it is posted, so a late posting leaves earlier work outside its coverage. General contractors miss that ten-day deadline often, and a subcontractor searching the registry will sometimes find no project entry at all. This is where claimants give up unnecessarily. Section 572.13A(2) expressly allows a subcontractor to post the notice of commencement itself, in conjunction with the posting of its own required preliminary notice. The subcontractor does not need the general contractor's cooperation, permission, or signature. Note the asymmetry: the general contractor that blew its own ten-day deadline has already forfeited its lien under § 572.13A(4), while the subcontractor that cures the gap keeps full lien rights. When the notice of commencement is posted, § 572.13A(3) directs the administrator to assign an MNLR number and send the owner the statutory warning that persons furnishing labor or materials may enforce a lien even without a direct contract with the owner, and that the owner may have to pay a registry-posted claimant even after paying the general contractor in full.
The Balance-Due Rule — Measured Twice
Posting a valid preliminary notice preserves the lien; it does not fix its value. Section 572.13B(3)(a) applies two ceilings, and the claimant is limited by both. A mechanic's lien perfected under chapter 572 is enforceable only to the extent of the balance due the general contractor or owner-builder at the time of the posting of the preliminary notice, and — except for residential construction property owned by an owner-builder — also only to the extent of the balance due the general contractor at the time the owner actually receives the notice sent by the administrator. Two moments, two ceilings, and the lower one controls. The interval between posting and actual owner receipt is therefore not administrative dead time — a draw disbursed in that window reduces the operative balance. And under § 572.13B(3)(b)(1), in any action to enforce the lien against the owner, the subcontractor bears the burden of proving by a preponderance of the evidence that the owner received the notice. The statute supplies the tools. Section 572.13B(2) has the administrator send the owner notification when the preliminary notice is posted and provide proof of service at no cost on request. Section 572.13B(3)(b)(1) lets the subcontractor satisfy its burden by serving the owner separately — by certified mail with return receipt, by personal service in the manner original notices are served, or by actual notice with a signed receipt acknowledging it. Section 572.13B(3)(b)(2) adds the most useful device of all: if the subcontractor provides an affidavit of mailing, the owner is presumed to have received the notice on the fourth business day for the post office after it was sent, and the burden shifts to the owner to refute it. Notices under this section are not sent to owner-builders.
Required Information and How to Post to the MNLR
Section 572.13B(1) enumerates ten required fields: the name of the owner; the Mechanics' Notice and Lien Registry number; the name, address, and telephone number of the subcontractor furnishing the labor, service, equipment, or material; the name and address of the person who contracted with the claimant; the name of the general contractor or owner-builder under which the claimant is performing the work; the address of the property or a description of its location; the legal description adequately describing the property to be charged with the lien; the date material was first furnished or labor first performed; the tax parcel identification number; and any other information required by the administrator by rule. Because the notice attaches to an MNLR project entry, the registry number is the field that ties everything together — a notice posted against the wrong project protects nothing. The legal description and tax parcel number carry unusual weight for a second reason: § 572.8(3) limits a perfected lien to the county or counties identified on the registry when the § 572.13A and § 572.13B notices were posted, so a property misidentified at the notice stage caps the lien months later. The preliminary notice is posted to the registry internet site — not recorded with a county recorder. If no project entry exists, post the notice of commencement first under § 572.13A(2) and then the preliminary notice in conjunction with it. Iowa has 99 counties; the highest-volume for construction lien activity are Polk (Des Moines), Linn (Cedar Rapids), Scott (Davenport), Johnson (Iowa City), Black Hawk (Waterloo), Woodbury (Sioux City), Dubuque, Story (Ames), Dallas, and Pottawattamie (Council Bluffs).
Perfecting and Enforcing the Iowa Mechanic's Lien
The lien itself is perfected the same way the notice is given. Under § 572.8(1), a claimant perfects an Iowa mechanic's lien by posting to the MNLR a verified statement of account of the demand due, after allowing all credits, setting forth the first and last dates material was furnished or labor performed, a legal description adequately describing the property, the owner's name and last known mailing address, the property address or a description of its location, and the tax parcel identification number. Section 572.8(2) then has the administrator mail a copy of the lien to the owner. Section 572.9 gives a general contractor or subcontractor two years and ninety days after the last material was furnished or the last labor performed to post that statement. The generosity is misleading, because the first ninety days are the valuable part. Beyond ninety days, § 572.10 permits perfection only if the claimant also gives the owner written notice of the posted lien, served in the manner original notices are required to be served — and § 572.11 then limits enforcement against the property to the balance due from the owner to the general contractor at the time that notice is served. The same erosion problem that governs the preliminary notice reappears at the lien stage. Section 572.27 sets the outer boundary: an action to enforce a mechanic's lien must be brought within two years from the expiration of the ninety days after the date the last material was furnished or the last labor performed. Settlement discussions do not toll it.
Frequently Asked Questions
What is the deadline for an Iowa preliminary notice?
Iowa sets no day-count deadline, and that is the most misunderstood feature of Iowa lien practice. Under Iowa Code § 572.13B, a preliminary notice posted to the Mechanics' Notice and Lien Registry before the balance due is paid to the general contractor or owner-builder is effective as to all labor, service, equipment, and material the subcontractor furnished. There is no 20-day rule as in California or Michigan and no 21-day rule as in Ohio — the subcontractor races the owner's payment schedule instead of a calendar. Post while the owner still owes the general contractor and the notice reaches back over everything already furnished; post after the owner paid in full and § 572.13B(3) leaves the lien worth nothing.
Who must post an Iowa preliminary notice, and does it apply to commercial projects?
Section 572.13B(5) limits the requirement to residential construction properties, and there it applies to subcontractors — parties without a direct contract with the owner. A general contractor posts no preliminary notice, but on residential work must post a § 572.13A notice of commencement within ten days of starting or lose its own lien rights. Commercial projects follow a separate track: § 572.33 applies only to commercial construction and only to a person furnishing labor or materials to a subcontractor, who must give the general contractor or owner-builder a one-time written notice within thirty days of first furnishing plus a certified statement supporting the lien claim. A first-tier subcontractor of the GC on a commercial job has no notice duty at all.
What happens if a subcontractor fails to post an Iowa preliminary notice?
Section 572.13B(4) is categorical: a subcontractor who fails to post is not entitled to a lien or remedy under chapter 572. This is stricter than Ohio, Michigan, and Utah, where a late notice still protects work furnished after service. In Iowa there is no partial credit on residential construction — no posting means no lien, regardless of the amount owed or how well documented the claim is. What survives is an ordinary breach-of-contract action against whoever hired the claimant, which is the party already failing to pay. Because the posting is inexpensive and the penalty is total, post on every Iowa residential project at the start of the job.
Must an Iowa notice of commencement exist before a preliminary notice can be posted?
Yes, but the subcontractor can solve it alone. Section 572.13A(2) requires a notice of commencement on the registry before any § 572.13B preliminary notice may be posted. The general contractor or owner-builder should post it within ten days of commencing work, and one that fails forfeits its own lien under § 572.13A(4). Because general contractors miss this routinely, § 572.13A(2) lets a subcontractor post the notice of commencement itself, in conjunction with its own preliminary notice. A subcontractor that finds no project entry and assumes the door is closed is surrendering rights the statute preserves — post both, the same day.
How does the Iowa balance-due rule limit a subcontractor's lien?
Section 572.13B(3)(a) measures the balance twice and caps the claimant by both. The lien is enforceable only to the extent of the balance due the general contractor or owner-builder when the preliminary notice is posted, and — except for residential property owned by an owner-builder — also only to the extent of the balance due the general contractor when the owner actually receives the registry notice. Two moments, two ceilings, and the lower one controls, so a draw disbursed between posting and receipt shrinks the claim. That is why posting early in the job, while the unpaid balance to the general contractor is still large, is worth far more than a technically valid notice posted late.
How does a subcontractor prove the Iowa owner received the notice?
Section 572.13B(2) has the registry administrator notify the owner when the notice is posted and furnish proof of service at no cost on request, but § 572.13B(3)(b)(1) puts the burden on the subcontractor to prove owner receipt by a preponderance of the evidence in any enforcement action against the owner. The statute lists ways to carry it by serving the owner separately: certified mail with return receipt, personal service in the manner original notices are served, or actual notice with a signed acknowledgment. Section 572.13B(3)(b)(2) adds a presumption — with an affidavit of mailing, the owner is presumed to have received the notice on the fourth business day after it was sent, shifting the burden to the owner. Notices are not sent to owner-builders.
When must an Iowa mechanic's lien be posted and enforced?
Section 572.8 perfects the lien by posting a verified statement of account to the registry rather than recording with a county. Section 572.9 allows a general contractor or subcontractor two years and ninety days after last furnishing to post it, but the first ninety days are the valuable part: past ninety days, § 572.10 requires written notice to the owner and § 572.11 limits enforcement against the property to the balance due from the owner to the general contractor when that notice is served. Section 572.27 requires the enforcement action within two years from the expiration of the ninety days after last furnishing. Note § 572.8(3) as well — the lien reaches only the counties identified on the registry when the § 572.13A and § 572.13B notices were posted.