Iowa Mechanic Lien Law: Complete Guide
Your Complete Guide to Mechanic Lien Rights Under Iowa Code §572.1 et seq. — Private Works, Preliminary Notices & Public Project Bond Claims
Iowa mechanic lien deadline table with toggles for project type and claimant type.
Iowa Preliminary Notice & Mechanic Lien Deadlines
Select your project type and role to see the deadlines that apply to you.
Prime Contractor — In privity with the property owner
Not required for a prime contractor in direct contract with the owner.
On residential projects, the prime contractor should post a Notice of Commencement to the Mechanic's Notice and Lien Registry (MNLR) to set the framework for subcontractor and supplier preliminary notices.
Record a Mechanic's Lien within 90 days after last furnishing labor or materials to preserve priority against the owner and subsequent purchasers or encumbrancers.
On residential projects, file through the Mechanic's Notice and Lien Registry (MNLR).
On commercial projects, file with the clerk of district court in the county where the property is located.
A lien may be filed after 90 days, but rights against subsequent good-faith purchasers and encumbrancers may be lost.
Commence an action to foreclose the Mechanic's Lien within 2 years and 90 days after last furnishing of labor or materials.
Preliminary Notice
Not required for a prime contractor in direct contract with the owner.
On residential projects, the prime contractor should post a Notice of Commencement to the Mechanic's Notice and Lien Registry (MNLR) to set the framework for subcontractor and supplier preliminary notices.
Mechanic Lien
Record a Mechanic's Lien within 90 days after last furnishing labor or materials to preserve priority against the owner and subsequent purchasers or encumbrancers.
On residential projects, file through the Mechanic's Notice and Lien Registry (MNLR).
On commercial projects, file with the clerk of district court in the county where the property is located.
A lien may be filed after 90 days, but rights against subsequent good-faith purchasers and encumbrancers may be lost.
Enforcement
Commence an action to foreclose the Mechanic's Lien within 2 years and 90 days after last furnishing of labor or materials.
Iowa private project deadlines
Prime Contractor
Preliminary Notice: Not required for a prime contractor in direct contract with the owner. On residential projects, the prime contractor should post a Notice of Commencement to the Mechanic's Notice and Lien Registry (MNLR) to set the framework for subcontractor and supplier preliminary notices.
Mechanic Lien: Record a Mechanic's Lien within 90 days after last furnishing labor or materials to preserve priority against the owner and subsequent purchasers or encumbrancers. On residential projects, file through the Mechanic's Notice and Lien Registry (MNLR). On commercial projects, file with the clerk of district court in the county where the property is located. A lien may be filed after 90 days, but rights against subsequent good-faith purchasers and encumbrancers may be lost.
Enforcement: Commence an action to foreclose the Mechanic's Lien within 2 years and 90 days after last furnishing of labor or materials.
Subcontractors & Suppliers
Preliminary Notice: On residential projects, post a Preliminary Notice to the Mechanic's Notice and Lien Registry (MNLR) before the owner has paid the prime contractor in full. Recovery on a residential lien is limited to amounts owed by the owner to the prime contractor at the time the preliminary notice was posted — post early to preserve the full claim. On commercial projects, no preliminary notice is required. Lien rights are preserved by filing the Mechanic's Lien within the 90-day window. Best practice is to post the Preliminary Notice at the start of the project on every residential job, not wait until a payment issue arises.
Mechanic Lien: Record a Mechanic's Lien within 90 days after last furnishing labor or materials to preserve priority against the owner and subsequent purchasers or encumbrancers. On residential projects, file through the Mechanic's Notice and Lien Registry (MNLR) and serve the owner as required. On commercial projects, file with the clerk of district court in the county where the property is located. A lien filed after 90 days is limited to amounts owed by the owner to the prime contractor at the time of filing.
Enforcement: Commence an action to foreclose the Mechanic's Lien within 2 years and 90 days after last furnishing of labor or materials.
Remote Claimants
Preliminary Notice: On residential projects, post a Preliminary Notice to the Mechanic's Notice and Lien Registry (MNLR) before the owner has paid the prime contractor in full. Recovery on a residential lien is limited to amounts owed by the owner to the prime contractor at the time the preliminary notice was posted. On commercial projects, no preliminary notice is required. Lien rights are preserved by filing the Mechanic's Lien within the 90-day window. Remote claimants bear the greatest risk of late posting. Post the MNLR Preliminary Notice immediately upon first furnishing on every residential project.
Mechanic Lien: Record a Mechanic's Lien within 90 days after last furnishing labor or materials to preserve priority against the owner and subsequent purchasers or encumbrancers. On residential projects, file through the Mechanic's Notice and Lien Registry (MNLR) and serve the owner as required. On commercial projects, file with the clerk of district court in the county where the property is located. A lien filed after 90 days is limited to amounts owed by the owner to the prime contractor at the time of filing.
Enforcement: Commence an action to foreclose the Mechanic's Lien within 2 years and 90 days after last furnishing of labor or materials.
Iowa public works deadlines
Prime Contractor
Preliminary Notice: Not applicable. The prime contractor is the principal on the payment bond and pursues payment through contract remedies, not a bond claim.
Bond Claim: Not applicable. Mechanic liens cannot attach to public property in Iowa. Prime contractors pursue payment through contract remedies against the public owner.
Lawsuit to Enforce Bond Claim: Contract remedies against the public owner, subject to any applicable notice-of-claim and limitations periods.
Subcontractors & Suppliers
Preliminary Notice: No pre-work preliminary notice is required on Iowa public works projects. Rights are preserved by timely filing the Bond Claim with the public body.
Bond Claim: File a verified Bond Claim with the public body (the governmental entity that contracted for the improvement) within 30 days after the public body's completion and final acceptance of the project. Mechanic liens cannot attach to public property in Iowa. Payment rights run through the payment bond and the retained percentage held by the public body. A claim filed after the 30-day window may still reach any retained funds remaining in the public body's hands but loses priority against earlier claimants.
Lawsuit to Enforce Bond Claim: Commence an action on the payment bond not earlier than 30 days after final acceptance of the public improvement, and no later than 60 days after final acceptance.
Remote Claimants
Preliminary Notice: No pre-work preliminary notice is required on Iowa public works projects. Rights are preserved by timely filing the Bond Claim with the public body.
Bond Claim: File a verified Bond Claim with the public body (the governmental entity that contracted for the improvement) within 30 days after the public body's completion and final acceptance of the project. Mechanic liens cannot attach to public property in Iowa. Payment rights run through the payment bond and the retained percentage held by the public body. A claim filed after the 30-day window may still reach any retained funds remaining in the public body's hands but loses priority against earlier claimants.
Lawsuit to Enforce Bond Claim: Commence an action on the payment bond not earlier than 30 days after final acceptance of the public improvement, and no later than 60 days after final acceptance.
Iowa Mechanic Lien Law Overview
Last updated April 2026 · Reviewed by Thomas Emalfarb, Esq.
Iowa construction mechanic lien rights are governed by Iowa Code §572.1 et seq. This statutory framework provides mechanic's lien rights to contractors, subcontractors, and material suppliers who furnish labor or materials for the improvement of real property in the State of Iowa. The statute establishes the procedures for perfecting a mechanic lien, including notice obligations and filing deadlines that must be strictly followed.
Iowa distinguishes between residential and commercial projects for preliminary notice purposes. On residential projects, subcontractors and suppliers not in privity with the property owner must deliver a preliminary notice within 30 days of first furnishing labor or materials. On commercial projects, the preliminary notice deadline extends to 90 days. General contractors are not required to serve a preliminary notice under Iowa law.
All claimants must perfect their mechanic lien by filing a verified statement of account (mechanic lien claim) within 90 days after the date of last furnishing labor or materials, or within 90 days after the completion or cessation of the work, whichever is applicable. Enforcement suits must be commenced within 2 years from the expiration of the 90-day filing period.
For public works projects, Iowa Code §573.1 et seq. governs bond claims. Subcontractors and suppliers not in privity with the general contractor must provide written notice to the general contractor within 30 days of first furnishing. Bond claims must be filed within 30 days after the final settlement between the public entity and the general contractor. National Lien & Bond provides attorney-network compliance and recovery services to help Iowa construction professionals protect their payment rights.
Topics on This Page
Iowa Mechanic Lien Law: Key Topics
Navigate the critical compliance areas for Iowa construction mechanic lien law.
Notice Requirements
Preliminary notice within 30 days (residential) or 90 days (commercial) for subs/suppliers not in privity; no notice required for general contractors
Mechanic Lien Deadlines
Verified mechanic lien claim within 90 days after completion or cessation of work for all claimants
Mechanic Lien Enforcement Deadlines
Suit within 2 years from expiration of 90-day filing period; public works bond claims within 30 days after final settlement
Frequently Asked Questions
What statute governs mechanic liens in Iowa?
Mechanic's liens in Iowa are governed by Iowa Code §572.1 et seq. Public works bond claims are governed by Iowa Code §573.1 et seq.
Is a preliminary notice required to file a mechanic lien in Iowa?
General contractors do not need a preliminary notice. Subcontractors and suppliers not in privity with the owner must serve notice within 30 days (residential) or 90 days (commercial) of first furnishing.
What is the deadline to file a mechanic lien in Iowa?
All claimants must file a verified statement of account within 90 days after the date of completion or cessation of work under Iowa Code §572.1 et seq.
How does Iowa mechanic lien law differ from other states?
Iowa distinguishes between residential (30-day) and commercial (90-day) preliminary notice deadlines. Iowa also uses a verified statement of account rather than a traditional claim of mechanic lien, and mechanic liens relate back to the date of first visible improvement.
What are the notice requirements for Iowa public works bond claims?
Subcontractors and suppliers not in privity with the general contractor must provide written notice to the GC within 30 days of first furnishing. Bond claims must be filed within 30 days after final settlement.
What is the deadline to file suit to enforce an Iowa construction mechanic lien?
Suit must be commenced within 2 years from the expiration of the 90-day mechanic lien filing period. For public works bond claims, the claim must be filed within 30 days after final settlement.