Illinois • Mechanics Lien Deadlines
Illinois Mechanics Lien Deadline Calculator
Learn the exact preliminary notice and lien filing deadlines in Illinois. Then jump into the LienDeadline calculator to see your real project dates in 0.3 seconds.
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Illinois Lien Deadline Overview
Preliminary Notice Deadline
Must serve notice within 90 days of last furnishing
Mechanics Lien Filing Deadline
4 months after last furnishing labor or materials
Typical Projects
Building material suppliers, lumber yards, concrete and rebar suppliers working on private construction projects in Illinois.
This page is a simplified summary for material suppliers and does not replace advice from a construction attorney.
How lien deadlines work in Illinois
In Illinois, material suppliers must follow specific deadlines to protect their lien rights. The preliminary notice deadline is must serve notice within 90 days of last furnishing. The mechanics lien filing deadline is 4 months after last furnishing labor or materials. Missing either deadline results in complete loss of lien rights for that project.
Preliminary notice rules
- Must serve Notice of Lien Claim within 90 days of last work
- Must serve notice within 90 days of last furnishing
- Notice of Lien Claim required for material suppliers
Mechanics lien filing rules
- Must serve Notice of Lien Claim within 90 days of last work
- Lien must be filed within 4 months of last furnishing
- 4 months after last furnishing labor or materials
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Frequently asked questions
What is the mechanics lien deadline in Illinois?
4 months after last furnishing labor or materials
Does Illinois require a preliminary notice?
Must serve notice within 90 days of last furnishing
What happens if I miss the deadline?
You lose your legal right to file a lien for that project, even if you're still owed money. That's why many suppliers use automated deadline tools instead of spreadsheets.