What This Calculator Does
This free tool estimates the statutory deadlines that apply to your Illinois mechanic lien rights under 770 ILCS 60 (the Mechanics Lien Act) and 30 ILCS 550 (the Public Construction Bond Act). Enter your project type, your role, and your last date of furnishing labor or material — and the calculator produces estimated dates for every critical deadline.
Missing even one deadline can permanently forfeit your right to payment. This calculator helps you identify those dates early so you can act — but estimated dates are only a starting point. The actual deadlines that apply depend on your contract, the type of work performed, the property's legal status, and other project-specific facts.
What type of project is this?
Select the project type that best describes where the work was performed.
Who Should Use This Tool
General Contractors
Track your 4-month recording and 2-year enforcement deadlines on private projects.
Subcontractors
Identify your 90-day Section 24 notice and residential 60-day notice deadlines.
Material Suppliers
Deadlines run from your last delivery date — know your notice and recording windows.
Important Disclaimer
This calculator provides estimated deadlines only and does not constitute legal advice. Actual deadlines may vary depending on your contract, the nature of the project, the property's legal status, and other facts specific to your situation. Do not rely solely on these estimates — consult a licensed Illinois attorney before taking or declining to take any action based on these results.
How This Illinois Mechanic Lien Deadline Calculator Works
This free calculator estimates your key Illinois mechanic lien deadlines based on three inputs: your project type (private residential, private commercial, or public), your role (general contractor or subcontractor/supplier), and your last date of furnishing labor or material. The tool applies the statutory frameworks under 770 ILCS 60 (the Illinois Mechanics Lien Act) and 30 ILCS 550 (the Illinois Public Construction Bond Act) to compute estimated deadlines.
Because Illinois lien law imposes strict, non-extendable deadlines, even a single missed date can permanently forfeit your right to payment. This calculator helps you identify the deadlines that may apply — but always confirm with an attorney before relying on any date.
Deadlines Covered by This Tool
Section 24 Notice (90 Days)
Under 770 ILCS 60/24, subcontractors and material suppliers on private projects must serve written notice on the property owner within 90 days of their last date of furnishing labor or materials. Missing this deadline can eliminate your lien rights entirely.
Mechanic Lien Recording (4 Months)
Under 770 ILCS 60/7, all lien claimants on private projects must record their lien claim with the county recorder within four months of their last date of furnishing labor or material. This is a hard statutory deadline — courts will not extend it.
Lien Enforcement (2 Years)
Under 770 ILCS 60/34, a recorded lien must be enforced by filing a foreclosure lawsuit within two years from the last date of furnishing labor or material — but a property owner can shorten this to 30 days by serving a Section 34 demand letter.
Payment Bond Claims (Public Projects)
On public construction projects, subcontractors and suppliers may have a claim against the project's payment bond. The notice deadline is 180 days and the lawsuit deadline is one year from last furnishing.
Public Lien on Funds
Under 770 ILCS 60/23.1, subcontractors on public projects may claim a lien on funds owed to the general contractor. This notice must be served before the public entity disburses payment — there is no fixed day count, so immediate action is critical.
Why Deadlines Matter in Illinois Construction Law
Illinois mechanic lien law is strictly enforced. Unlike most civil claims where statutes of limitation can be months or years, construction payment deadlines can be as short as 90 days. Courts have consistently held that failure to comply with even minor procedural requirements — such as serving notice one day late or recording a lien with the wrong county — results in complete forfeiture of lien rights.
This is why we built this calculator: to help Illinois contractors, subcontractors, and suppliers identify their critical dates early. But estimated dates are only the starting point. The actual deadlines that apply to your project depend on your contract, the type of work performed, the property's legal status, and other project-specific facts that only an attorney review can confirm.
Next Steps After Calculating Your Deadlines
After reviewing your estimated deadlines, we recommend starting intake with our office so we can open a file, verify your dates, and advise on the best path forward. Our free Illinois lien deadline and options check confirms which remedies apply and what action to take next.