Wisconsin Mechanic Lien Law: Complete Guide
Your Complete Guide to Mechanic Lien Rights Under Wis. Stats. §779.01 Through §779.13 — Private Works, Payment Bonds, Mechanic Lien on Funds & Public Projects
Wisconsin mechanic lien deadline table with toggles for project type and claimant type.
Wisconsin 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
All claimants — including the prime — must serve a Notice of Intent to File Claim for Lien on the owner at least 30 days before recording the Claim for Lien.
Record the Claim for Lien with the clerk of circuit court in the county where the property is located within 6 months after last furnishing labor or materials.
Reminder: A Notice of Intent to File Claim for Lien must then be served on the owner at least 30 days before recording the Claim for Lien.
Commence a suit to foreclose the Claim for Lien within 2 years after the Claim for Lien is recorded.
Preliminary Notice
All claimants — including the prime — must serve a Notice of Intent to File Claim for Lien on the owner at least 30 days before recording the Claim for Lien.
Mechanic Lien
Record the Claim for Lien with the clerk of circuit court in the county where the property is located within 6 months after last furnishing labor or materials.
Reminder: A Notice of Intent to File Claim for Lien must then be served on the owner at least 30 days before recording the Claim for Lien.
Enforcement
Commence a suit to foreclose the Claim for Lien within 2 years after the Claim for Lien is recorded.
Wisconsin private project deadlines
Prime Contractor
Preliminary Notice: Residential add-on (1-4 family dwelling): prime contractors must include a written Contractor's Preliminary Notice in the contract with the owner. If there is no written contract, serve the Contractor's Preliminary Notice on the owner within 10 days after first furnishing labor or materials. All claimants — including the prime — must serve a Notice of Intent to File Claim for Lien on the owner at least 30 days before recording the Claim for Lien.
Mechanic Lien: Record the Claim for Lien with the clerk of circuit court in the county where the property is located within 6 months after last furnishing labor or materials. Reminder: A Notice of Intent to File Claim for Lien must then be served on the owner at least 30 days before recording the Claim for Lien.
Enforcement: Commence a suit to foreclose the Claim for Lien within 2 years after the Claim for Lien is recorded.
Subcontractors & Suppliers
Preliminary Notice: Residential add-on (1-4 family dwelling): serve an Identification Notice on the owner within 60 days after first furnishing labor or materials. Best practice is to serve the Identification Notice at the start of the project, not at the 60-day cutoff. A Notice of Intent to File Claim for Lien must be served on the owner at least 30 days before recording the Claim for Lien.
Mechanic Lien: Record the Claim for Lien with the clerk of circuit court in the county where the property is located within 6 months after last furnishing labor or materials. Reminder: A Notice of Intent to File Claim for Lien must then be served on the owner at least 30 days before recording the Claim for Lien.
Enforcement: Commence a suit to foreclose the Claim for Lien within 2 years after the Claim for Lien is recorded.
Remote Claimants
Preliminary Notice: Residential add-on (1-4 family dwelling): remote subcontractors and material suppliers must serve an Identification Notice on the owner within 60 days after first furnishing labor or materials. Best practice is to serve the Identification Notice at the start of the project, not at the 60-day cutoff. A Notice of Intent to File Claim for Lien must be served on the owner at least 30 days before recording the Claim for Lien.
Mechanic Lien: Record the Claim for Lien with the clerk of circuit court in the county where the property is located within 6 months after last furnishing labor or materials. Reminder: A Notice of Intent to File Claim for Lien must then be served on the owner at least 30 days before recording the Claim for Lien.
Enforcement: Commence a suit to foreclose the Claim for Lien within 2 years after the Claim for Lien is recorded.
Wisconsin 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 Wisconsin. Prime contractors pursue payment through contract remedies.
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: Serve written notice on the prime contractor within 60 days after the claimant first furnished labor or materials. The public works notice mirrors the private project Identification Notice.
Bond Claim: Not applicable. Mechanic liens cannot attach to public property in Wisconsin. Payment rights run through the prime contractor's payment bond.
Lawsuit to Enforce Bond Claim: Commence a suit on the payment bond within 1 year after completion and acceptance of the public project.
Remote Claimants
Preliminary Notice: Serve written notice on the prime contractor within 60 days after the claimant first furnished labor or materials. The public works notice mirrors the private project Identification Notice.
Bond Claim: Not applicable. Mechanic liens cannot attach to public property in Wisconsin. Payment rights run through the prime contractor's payment bond.
Lawsuit to Enforce Bond Claim: Commence a suit on the payment bond within 1 year after completion and acceptance of the public project.
Wisconsin Mechanic Lien Law Overview
Last updated May 2026
Wisconsin construction mechanic lien rights are governed by Wisconsin Statutes §779.01 through §779.13. This statutory framework provides Construction Mechanic Lien rights to prime contractors, subcontractors, suppliers, and service providers who furnish labor or materials for the improvement of real property in the State of Wisconsin. Equipment lessors do not have mechanic lien rights under Wisconsin law.
Wisconsin has a multi-layered notice system. Prime contractors must serve a Contractor's Preliminary Notice on the owner as part of all written contracts or within 10 days after first furnishing if there is no written contract. Subcontractors and suppliers on residential projects (4 or fewer family units) must serve a Non-Contractor's Preliminary Notice on the owner within 60 days of first performance or delivery. All claimants must also serve a Notice of Intent to File a Mechanic Lien Claim on the owner at least 30 days before filing.
All claimants must record a Claim of Mechanic Lien within 6 months after last furnishing labor or materials. If the prime contractor furnishes a payment bond meeting the requirements of §779.035, subcontractor and material supplier mechanic lien rights are extinguished and claims must be made against the bond instead.
Wisconsin also provides mechanic lien on funds remedies for both private and public works projects, and public works payment bond claims under §779.14. National Lien & Bond provides authoritative guidance on every aspect of Wisconsin construction mechanic lien compliance.
Wisconsin Mechanic Lien Notice Requirements
Notice obligations that must be satisfied before filing a mechanic lien in Wisconsin.
Who Has Lien Rights in Wisconsin
You may assert a mechanic lien on a private project if you contract with:
- The owner
- The prime contractor
- A subcontractor
Wisconsin statutes also strongly suggest that claimants contracting with sub-subcontractors may preserve lien rights. Equipment lessors do not have mechanic lien rights under Wisconsin law.
No Preliminary Notice on Pure Commercial Projects
Thanks to the 2006 statutory updates, Wisconsin eliminated the 10-day and 60-day preliminary notice requirements for pure commercial projects. That means:
- No early notice to owners or prime contractors is required on commercial work
- Your lien rights remain intact without any preliminary notice — with one exception involving private payment bonds (covered below)
Residential projects (1-4 family dwellings, owner-occupied) and mixed-use projects still require preliminary notices under §779.02 — see the deadline tables above for the current residential rules.
Notice of Intent to File — Required on Every Project
All claimants — prime contractors, subcontractors, and suppliers — must serve a Notice of Intent to File a Mechanic Lien Claim on the owner at least 30 days before recording the Claim for Lien, after substantial completion of the work. §779.06(2). Failure to serve this notice can invalidate the lien claim.
Payment Bond Exception
If the prime contractor furnishes a qualifying payment bond under §779.035, subcontractor and supplier mechanic lien rights are extinguished and claims must be made against the bond instead. To preserve bond rights, the claimant must give written notice to the prime contractor within 60 days of first performance — unless the contract is under $5,000, the claimant is listed in the contract, or the claim is by an employee.
How to File a Mechanic Lien in Wisconsin: Step-by-Step
An overview of the statutory process — each step is technical and typically handled by an attorney.
- 1
Serve the Notice of Intent to File a Mechanic Lien — by certified mail to the owner, at least 30 days before recording the lien and no later than 5 months after your last furnishing date so the 30-day waiting period clears before the 6-month filing deadline. Because the Notice of Intent requires specific title information and strict timing, start the process shortly after month four.
- 2
Record the Claim for Lien with the Clerk of Circuit Court in the county where the property is located, within 6 months after last furnishing labor or materials. §779.06(1),(3). The 6-month clock runs from the last day of furnishing, not from project completion.
- 3
After recording, serve a copy of the recorded lien on the owner — best practice is certified mail within 30 days of recording. §779.01(2)(c) requires personal delivery, registered or certified mail, or another method where the recipient confirms delivery in writing.
- 4
If the lien is not paid, commence a suit to foreclose the Claim for Lien within 2 years after the lien is recorded. §779.10. Suit is filed in the circuit court of the county where the property is located.
Topics on This Page
Wisconsin Mechanic Lien Law: Key Topics
Navigate the critical compliance areas for Wisconsin construction mechanic lien law.
Notice Requirements
Contractor's and Non-Contractor's Preliminary Notice, Notice of Intent to File a Mechanic Lien Claim, payment bond notice, and mechanic lien on funds notice procedures
Mechanic Lien Deadlines
6-month Claim of Mechanic Lien filing deadline, Notice of Intent 30-day pre-filing requirement, and payment bond extinguishment rules
Mechanic Lien Enforcement Deadlines
2-year suit deadline, payment bond claims within 1 year, mechanic lien on funds suit within 3 months, and public works enforcement
Payment Bond Claims
Private bond rights under §779.035, public works bond claims under §779.14, 60-day notice requirements, 1-year suit deadlines, and lien on funds procedures
Frequently Asked Questions
What is the deadline to file a mechanic lien in Wisconsin?
Under Wis. Stat. §779.06(1), all claimants must record a Claim of Mechanic Lien within 6 months after the date they last furnished labor or materials to the project. The lien must be recorded with the Clerk of Circuit Court in the county where the property is located.
Who is eligible to file a mechanic lien in Wisconsin?
Prime contractors, subcontractors, sub-subcontractors, material suppliers, and service providers who furnish labor or materials for the improvement of real property in Wisconsin are eligible to file a mechanic lien. Equipment lessors do not have mechanic lien rights under Wisconsin law.
What notice is required before filing a mechanic lien in Wisconsin?
Two notices are required. First, prime contractors must serve a Contractor's Preliminary Notice on the owner in all written contracts or within 10 days of first furnishing if there is no written contract. Subcontractors on residential projects (4 or fewer units) must serve a Non-Contractor's Preliminary Notice within 60 days of first furnishing. Second, all claimants must serve a Notice of Intent to File a Mechanic Lien Claim on the owner at least 30 days before recording the lien. §779.06(2).
How do you enforce a mechanic lien in Wisconsin?
After recording the Claim of Mechanic Lien, the claimant must file a lien foreclosure action in circuit court within 2 years of the date the lien was recorded. §779.10. The suit must be filed in the county where the property is located. Failure to bring suit within the 2-year period extinguishes the lien.
What is the Wisconsin mechanic lien timeline for a subcontractor?
For a subcontractor on a residential project: serve Non-Contractor's Preliminary Notice within 60 days of first furnishing; serve Notice of Intent at least 30 days before filing; record Claim of Mechanic Lien within 6 months of last furnishing; file suit to enforce within 2 years of recording. On commercial projects, the preliminary notice is not required but the Notice of Intent and 6-month filing deadline still apply.