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IL  ·  Mechanic's Lien Guide

Illinois Mechanic's Lien Warning Requirements for Contractors

Know your deadlines before you lose your rights. Illinois lien law in plain English — no legalese, no fluff.

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Disclaimer: This is general information, not legal advice. Verify current deadlines with your state's contractor board or a construction attorney before relying on any figure here.
Key Deadlines

Illinois Lien Law at a Glance

📅
Lien Filing Deadline
4 months from last furnishing of labor or materials
from last day of furnishing labor or materials
⚠️
Preliminary Notice
Required
90 days from last furnishing for sub-subcontractors and remote suppliers
📋
Notice to Owner
Required
Sub-subcontractors and remote suppliers must serve a 90-day notice on the owner within 90 days of last furnishing to preserve lien rights.
👷
Who Can File
Contractors, subcontractors, sub-subcontractors, material suppliers, laborers
⚠️ Preliminary Notice Required

Illinois's Preliminary Notice Requirement

Sub-subcontractors and remote material suppliers must serve a "90-day notice" on the owner within 90 days of last furnishing. Direct subcontractors may also benefit from serving this notice.

Deadline: 90 days from last furnishing for sub-subcontractors and remote suppliers
Commercial vs Residential

Does the Property Type Change Your Deadline?

The 90-day notice requirement particularly matters for residential projects where the owner may have homestead protections. Verify with an attorney.

Common Mistakes

What Contractors Get Wrong in Illinois

1
Sub-subcontractors missing the 90-day notice requirement to the owner
2
Missing the 4-month lien filing deadline
3
Not filing in the correct county circuit court

Don't Lose Money Because of a Missing Form

The Contractor Pack includes a lien waiver template plus 6 other forms every contractor needs — estimates, invoices, change orders, subcontractor agreements, and more. One-time payment, yours forever.

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FAQ

Illinois Lien Law Questions

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This is general information, not legal advice. Verify current deadlines with your state's contractor board or a construction attorney. JobPapers sells document organization tools — we are not attorneys and do not provide legal services.