Last updated: April 2026
Illinois Mechanic Lien Deadlines
For both the general contractor and the subcontractor on private projects — regardless of whether it is a single-family residential or a private commercial project — a lien must be recorded or suit filed within four months of the date last worked to be enforceable against the lender of record, encumbrancers, or third-party purchasers. No lien is enforceable against any lender or third party unless it is recorded or suit is brought within four months of the date the claimant last performed work, as set forth in §7.
The purpose of the §7 requirement — which states that the lien claim must be filed within a stated time — is that third persons dealing with the property may have notice of the existence, nature, amount, and character of the lien, as well as the times when the material was furnished and labor performed, and thus be able to learn from the claim itself whether it is enforceable. If you need help with the filing process, or want to speak with an experienced mechanic lien attorney, we can help.
Illinois Mechanic Lien Deadlines Summary
| Deadline | Timeframe | Measured From | IL Statute |
|---|---|---|---|
| 60-Day Residential Notice | 60 days | First furnishing of labor/materials | 770 ILCS 60/5, 60/21 |
| 90-Day Notice | 90 days | Last furnishing of labor/materials | 770 ILCS 60/24, 60/25 |
| Lien Recording | 4 months | Last furnishing of labor/materials | 770 ILCS 60/7 |
| Foreclosure Lawsuit | 2 years | Last furnishing of labor/materials | 770 ILCS 60/7 |
Use our lien deadline calculator to calculate your specific deadlines based on your last date of work.
60-Day Notice — Owner-Occupied, Single-Family Residential Property
Under 770 ILCS 60/5 and 60/21, a subcontractor must serve notice on the owner within 60 days of first furnishing labor or materials if the property was owner-occupied during construction.
90-Day Notice Requirement
Whether the project is a single-family residence or a private commercial job, a subcontractor must serve notice of its claim on the owner and the lender, as required by Sections 24 or 25 of the Illinois Mechanics Lien Act, within 90 days after its last date of work or delivery of materials in order to enforce its lien against the owner, lender of record, or third parties. 770 ILCS 60/24, 60/25.
The 4-Month Recording Deadline — 770 ILCS 60/7
For both the general contractor and the subcontractor on private projects, regardless of whether it is a single-family residential or a private commercial project, a lien must be recorded or suit filed within four months of the date last worked to be enforceable against the lender of record, encumbrancers, or third-party purchasers. 770 ILCS 60/7.
Foreclosure Lawsuit — 770 ILCS 60/7
After recording the lien, the claimant must file a foreclosure lawsuit within two years of the last date of furnishing labor or materials, or the lien expires by operation of law. This two-year window can be shortened to as little as 30 days if the property owner serves a Section 34 demand requiring the claimant to file suit. 770 ILCS 60/7, 60/34.
2025 Update — HB 4660 Modernizes Section 24 Notice Delivery
Effective January 1, 2025, Illinois Public Act 103-0827 (HB 4660) amended 770 ILCS 60/24 to modernize how subcontractors and suppliers deliver their 90-day Section 24 notice. The 90-day deadline itself is unchanged, but the allowable delivery methods expanded significantly.
What HB 4660 Added
- FedEx, UPS, DHL and other nationally recognized tracked delivery services are now valid
- Eliminated the "restricted delivery to addressee only" requirement
- An authorized agent, office manager, or other adult at the delivery address may sign
What Did Not Change
- The 90-day deadline under 770 ILCS 60/24 still runs from last furnishing
- Content requirements — claimant, amount, and nature of work — remain
- Certified mail with return receipt is still a valid delivery method
For a deeper walkthrough including delivery-service eligibility and transition rules for notices that straddle January 1, 2025, see our HB 4660 analysis.
Step 1 — Establish Your Last Date of Furnishing
Every notice deadline, every recording window, and every enforcement period under 770 ILCS 60 is measured from dates tied to your time on the project — which is why knowing your first and last date of furnishing is the foundation of protecting your rights. Your last date of work is not:
The date of your last invoice
The date of your last pay application
The date the project reached substantial completion
It is the last day you were physically present performing contract work or delivering materials that improved the property.
Punch-List and Corrective Work
Returning solely to fix defective work, perform warranty repairs, or inspect completed items generally does not extend the last furnishing date. Courts look at whether the work added new value to the improvement.
The line between corrective and additional work is fact-specific, which is why documenting every site visit and the nature of the work performed is essential.
Step 2 — Serve the Section 24 Notice
Before a subcontractor or material supplier can enforce a mechanic lien on a private project, they must serve written notice of their claim on the property owner and the lender of record. This requirement applies to every private project — residential and commercial — and is governed by Sections 24 and 25 of the Illinois Mechanics Lien Act (770 ILCS 60/24, 60/25).
Serve Notice on Owner & Lender
The subcontractor must serve written notice on the owner and the lender within 90 days of the subcontractor's last date of furnishing labor or materials. The notice must identify the claimant, the amount claimed, and the nature of the work or materials furnished. 770 ILCS 60/24.
The notice must be sent by registered or certified mail, or served personally on the owner
A copy must also be served on the lender of record, if any
Failure to serve Section 24 notice within 90 days bars the subcontractor from enforcing the lien against the owner, lender, and third parties
General contractors with a direct contract with the owner are not required to serve Section 24 notice
Residential projects: On owner-occupied, single-family residential properties, a separate 60-day notice must also be served within 60 days of the subcontractor's first date of furnishing — in addition to the Section 24 notice.
Step 3 — Record Within Four Calendar Months
Once you have established your last date of furnishing, count forward four calendar months — not 120 days. Illinois uses calendar months, so if your last furnishing date is January 15, the deadline falls on May 15. The lien claim must be filed with the Recorder of Deeds in the county where the property is located.
Record Lien with County Recorder
File the verified lien claim with the Recorder of Deeds in the county where the property is located within 4 calendar months of your last date of furnishing labor or materials. Recording within this window preserves priority against subsequent purchasers, lenders, and judgment creditors under 770 ILCS 60/7.
Build in a safety margin. Allow at least 10 to 14 days before the statutory cutoff. If a deadline falls on a weekend or court holiday, Illinois courts have generally held that the filing is timely if made on the next business day — but relying on this grace period is risky and should be avoided. Review our step-by-step lien filing process for detailed procedural guidance.
Who Must Record Within Four Months
The 4-month recording requirement under §7 applies uniformly to every party in the construction chain on private projects:
General Contractors
GCs who contract directly with the property owner must record within 4 months of their last date of furnishing labor or materials.
Subcontractors & Sub-Subs
Subcontractors at every tier face the same 4-month recording window, measured from their own last date of furnishing.
Material Suppliers
Suppliers whose materials were incorporated into the improvement must record within 4 months of their last delivery to the project site.
Equipment Lessors
Parties who furnish equipment used in the improvement must record within the same 4-month window from last furnishing.
The deadline applies to both single-family residential and private commercial projects. The project type does not change the 4-month window — only whether additional notice requirements (such as the notice to owner) must also be satisfied.
Consequences of Missing the 4-Month Recording Deadline
The consequences of missing the 4-month recording window are severe. A lien recorded after the statutory period is no longer enforceable against third parties — including mortgage lenders, subsequent purchasers, judgment creditors, and other encumbrancers. Courts strictly enforce the time limits under 770 ILCS 60, and there is no equitable tolling or general extension available for mechanic lien recording deadlines.
A late-recorded lien may still be enforceable against the original property owner, but it loses the powerful priority protections that make a timely-recorded lien so effective. Without priority status, the lien is subordinate to every intervening third-party interest — which in many cases renders it practically unenforceable.
If you believe you may have missed or are approaching the 4-month deadline, contact an Illinois mechanic lien attorney immediately. Even if lien recording rights are lost, other remedies — such as a breach-of-contract claim or unjust enrichment action — may still be available. The sooner you act, the more options remain open.
Step 5 — File a Lawsuit to Enforce Your Mechanic Lien
Recording a mechanic lien secures your interest in the property — but it does not, by itself, force payment. To enforce the lien and recover the amount owed, you must file a mechanic lien foreclosure lawsuit in the circuit court of the county where the property is located. 770 ILCS 60/9.
File Foreclosure Suit
The lien claimant must file suit to foreclose the mechanic lien within two years of the claimant's last date of furnishing labor or materials. If no suit is filed within this period, the lien expires by operation of law. 770 ILCS 60/7.
The lawsuit must be filed in the circuit court of the county where the property is located
All parties with an interest in the property — owner, lender, other lien claimants — must be named as defendants
The court may order the property sold to satisfy the lien if the claimant prevails
Attorney fees may be recovered if the contract provides for them
Section 34 demand: The property owner can serve a written Section 34 demand requiring the lien claimant to file suit within 30 days. If the claimant fails to file within that shortened window, the lien is forfeited. 770 ILCS 60/34.
Section 34 Demand — The 30-Day Deadline Accelerator
Under 770 ILCS 60/34, any person interested in the property — typically the owner or a title insurer — may serve a written demand on the lien claimant requiring suit to be filed within 30 days. If the claimant fails to file a foreclosure action within that window, the mechanic lien is forfeited by operation of law and the lien claimant forever loses the right to enforce the recorded claim.
File Suit or Lose the Lien
When a proper Section 34 demand is served by registered or certified mail on the claimant, the two-year enforcement window collapses to 30 days. The foreclosure complaint must be filed in the circuit court of the county where the property sits, and all necessary parties must be named. 770 ILCS 60/34.
The demand must be in writing, served on the lien claimant by registered or certified mail
The 30-day clock runs from the date of service — not the date the letter was mailed
Consult counsel the moment a Section 34 letter arrives; there is no equitable extension
A timely-filed foreclosure complaint preserves the lien even if service on defendants takes longer
Full procedure and defensive strategy: see the Illinois Section 34 demand guide.
Tolling, Extensions, and the Corrective Work Distinction
Illinois mechanic lien deadlines are generally strict and not subject to equitable tolling. Courts have consistently refused to extend filing periods based on ongoing negotiations, promises of payment, or the claimant's ignorance of the law. However, if a contractor returns to the project to perform additional work — not merely punch-list or warranty items — the courts may reset the "last date of furnishing" to the date of that additional work, effectively extending the recording deadline.
The distinction between "extra work" and "corrective work" is critical. Returning to fix defective work or perform warranty repairs does not extend the lien deadline because those activities do not constitute new furnishing of labor or materials that improve the property. Only work that adds value to the improvement — such as change-order items or additional scope — qualifies. Because the line between corrective and additional work can be fact-specific, documenting every site visit and the nature of the work performed is essential to preserving lien rights.
Lien Priority Rules and Recording Order
Lien priority determines whose claim gets paid first when multiple parties assert interests in the same property. Under 770 ILCS 60/7, a mechanic lien recorded within 4 months of the claimant's last date of furnishing labor or material takes priority over any lien, mortgage, judgment, or other encumbrance that attaches after the date the work was commenced — not from the date the lien was recorded. This "relation back" doctrine is one of the most powerful features of Illinois mechanic lien law.
A timely-recorded mechanic lien can take priority over a construction mortgage recorded months earlier, as long as the claimant's work began before the mortgage attached. However, a lien recorded after the 4-month window loses this priority advantage and is subordinate to all intervening third-party interests.
Among multiple mechanic lien claimants, Illinois law does not rank liens based on filing order. Instead, all timely-recorded mechanic liens share equal priority and are satisfied pro rata from the available proceeds if the property is sold through a foreclosure action.
Material Supplier Considerations
Material suppliers who furnish building materials, fixtures, or equipment to a construction project have lien rights if their materials were actually incorporated into the improvement. The supplier's "last furnishing date" is the date of their last delivery of materials to the project site — not the date of their last invoice or statement.
Unlike subcontractors who perform labor over an extended period, suppliers often complete their deliveries well before the project is finished. This means their 4-month recording window may expire months before the general contractor's deadline, making early action essential.
Material suppliers must comply with the same Section 24 notice and 4-month recording requirements, but their deadlines are measured from their last delivery date rather than the last day of work on the project. For a full overview of mechanic lien rights and remedies, visit our Illinois mechanics lien law.
Public Project Deadline Differences
Public construction projects in Illinois do not allow traditional mechanic liens against government-owned property. Instead, contractors and suppliers must rely on two alternative remedies with their own distinct timelines:
Lien on Public Funds (770 ILCS 60/23)
Subcontractors must serve written notice on the public body within 90 days of their last date of furnishing labor or materials. Suit must be filed within 90 days of the general contractor's substantial performance. See the detailed lien on public funds guide.
Payment Bond Claim (30 ILCS 550)
Written notice must be provided to the public body within 180 days of the last date of furnishing labor or material. Any lawsuit against the surety must be filed within one year. Learn more about payment bond claims.
Evidence You Should Preserve to Prove Timely Filing
The burden of proving that every deadline was met falls on the lien claimant. Preserve the following records from the start of every project:
Deadline Evidence Checklist
- Daily job logs documenting every site visit and the nature of work performed
- Material delivery tickets with dates, quantities, and recipient signatures
- Signed time sheets for all workers assigned to the project
- County recorder's stamped copy of the recorded lien claim
- Pay applications and invoices with dates submitted
- Change orders and written approvals for additional work
- Project calendars and scheduling correspondence
- Photographs with embedded date/time stamps showing work in progress
Calculate Your Illinois Mechanic Lien Deadlines
Use the calculator below to estimate your 60-day, 90-day, 4-month, and 2-year deadlines. Choose your project type, role, and last date of furnishing — the calculator applies 770 ILCS 60, the Illinois Public Construction Bond Act (30 ILCS 550), and the federal Miller Act where applicable. Results are an estimate only; confirm every deadline with counsel before filing.
Project Type
This tool provides general estimates only. Illinois and federal deadlines vary based on project facts and documentation. Do not rely on these estimates without our office opening a file. Use of this calculator does not create an attorney-client relationship.
7 Mistakes That Void an Illinois Mechanic Lien
Illinois courts apply the Mechanics Lien Act strictly. The seven errors below are the most common reasons a technically-timely lien claim still fails — and why timely filing alone is not enough.
Overstating the Lien Amount
Intentionally inflating the claim can void the lien in its entirety as constructively fraudulent. Courts distinguish between good-faith errors and deliberate overstatement — document every dollar claimed.
Defective Legal Description
The lien must describe the property with sufficient particularity. A street address alone is often insufficient; use the legal description from the deed or a title commitment.
Signing an Unconditional Waiver for Partial Payment
An unconditional waiver extinguishes lien rights for the stated period even if payment is never received. Use conditional waivers until funds clear.
Mis-Dating the Last Day of Furnishing
Treating punch-list or warranty work as the 'last day' is the single most common error. Illinois courts reject extensions based on corrective or de minimis work.
Serving the Wrong Owner of Record
Notice served on a general contractor, agent, or prior owner does not satisfy 770 ILCS 60/24. Pull a current title report before serving the 90-day notice.
Missing the Weekend / Holiday Cutoff
Relying on a next-business-day grace period is risky. Calendar every deadline at least 10–14 days before the statutory date and file early.
Failing to Name All Necessary Defendants
A foreclosure complaint that omits a junior lienholder or mortgagee can leave title clouded and the lien unenforceable against missing parties. Pull title before filing suit.
Key Illinois Cases on Mechanic Lien Deadlines
Three published Illinois decisions illustrate how strictly courts apply the deadlines in 770 ILCS 60. Each is worth reading before any deadline dispute goes to court.
Weather-Tite, Inc. v. University of St. Francis, 233 Ill. 2d 385 (2009)
The Illinois Supreme Court held that a contractor's return to perform corrective punch-list items did not extend the §7 last-date-of-furnishing clock. The critical test is whether the later work added new value to the improvement — not whether the claimant was still physically present on site.
Deadline takeaway: Document every site visit and the nature of the work. Warranty callbacks do not reset the 4-month clock.
First Federal Savings & Loan Ass'n v. Connelly, 97 Ill. 2d 242 (1983)
The Illinois Supreme Court reaffirmed the strict-compliance rule: because mechanic liens are purely statutory, every technical requirement — including timely recording and proper notice — must be satisfied. Equitable tolling, estoppel, and substantial compliance will not save a lien that missed the statutory window.
Deadline takeaway: Ongoing negotiations, promises of payment, or alleged acknowledgments of debt do not pause any Mechanics Lien Act deadline.
Cordeck Sales, Inc. v. Construction Systems, Inc., 382 Ill. App. 3d 334 (1st Dist. 2008)
The First District addressed the relation-back doctrine under §1 and §7: a timely-recorded lien relates back to the date the claimant's contract was entered or work began, giving it priority over intervening mortgages and third-party interests that attached later.
Deadline takeaway: Recording within the 4-month window is what preserves priority — a late-recorded lien loses the relation-back advantage even if it remains enforceable against the owner.
Where to Record — Illinois County Recorders
A mechanic lien must be recorded with the County Recorder of Deeds where the improved property is located. Recording fees, e-recording availability, and cover-sheet requirements vary by county. The Chicago-area counties we most commonly file in are summarized below — always confirm current fees directly with the recorder before submitting.
| County | Recorder | E-Recording | Location Page |
|---|---|---|---|
| Cook | Cook County Clerk — Recordings (118 N. Clark, Chicago) | Yes | Attorney in Cook County |
| DuPage | DuPage County Recorder (421 N. County Farm Rd., Wheaton) | Yes | Attorney in DuPage County |
| Lake | Lake County Recorder (18 N. County St., Waukegan) | Yes | Attorney in Lake County |
| Will | Will County Recorder (158 N. Scott St., Joliet) | Yes | Attorney in Will County |
| Kane | Kane County Recorder (719 S. Batavia Ave., Geneva) | Yes | Attorney in Kane County |
| McHenry | McHenry County Recorder (667 Ware Rd., Woodstock) | Yes | Attorney in McHenry County |
Cook County
Cook County Clerk — Recordings (118 N. Clark, Chicago)
E-recording: Yes
Attorney in Cook CountyDuPage County
DuPage County Recorder (421 N. County Farm Rd., Wheaton)
E-recording: Yes
Attorney in DuPage CountyKane County
Kane County Recorder (719 S. Batavia Ave., Geneva)
E-recording: Yes
Attorney in Kane CountyMcHenry County
McHenry County Recorder (667 Ware Rd., Woodstock)
E-recording: Yes
Attorney in McHenry CountyFees and cover-sheet requirements change periodically. The recorder's current fee schedule controls — always call or check the county website the week you plan to file.
Free Download — Illinois Lien Deadline Cheat Sheet (PDF)
One-page printable reference covering the 60-day, 90-day, 4-month, 2-year, and 30-day Section 34 clocks, plus the 2025 HB 4660 delivery-method update. Keep it on the job site or in the project file so no deadline slips.
Download the Cheat Sheet (PDF)Educational reference only — not legal advice. The statute and case law control in every deadline dispute.
Frequently Asked Questions About Illinois Lien Deadlines
Related Illinois Mechanic Lien Resources
Subcontractor lien deadlines
60-day, 90-day, 4-month, and 2-year deadlines for subcontractors
Deadline calculator
Calculate your specific deadlines based on your last date of work
Illinois Mechanics Lien Law
Complete overview of 770 ILCS 60 and your construction payment rights
Illinois mechanic lien attorney
Preserve, file, and enforce your mechanic lien rights
Step-by-step filing process
How to file and record your mechanic lien
Notice to owner
90-day Section 24 notice and residential 60-day notice requirements
Mechanic lien foreclosure
Enforce your recorded lien through a foreclosure lawsuit
Related Topics
Understanding recording deadlines is only part of the equation. Subcontractors and suppliers each face unique deadline triggers and must also comply with the notice to owner requirement to preserve lien rights. Use our deadline calculator to estimate your specific dates. If you need help navigating the process, consult an experienced Illinois mechanic lien attorney. For a complete overview of all lien topics, visit our Illinois construction lien law overview.