ILIllinois
Illinois Lien Deadlines for Material Suppliers
Illinois requires a Notice of Intent to Lien within 90 days of your last furnishing. For single-family owner-occupied projects, notice is due within 60 days of starting work.
Public date calculations cover Florida and Kansas. Illinois dates require qualified review.
Risk context
Illinois is High Risk for Suppliers
Illinois has a 90-day Notice of Intent to Lien requirement from last furnishing. However, if you are working on a single-family owner-occupied project, you must provide notice within 60 days of starting work. Missing these notices puts your lien rights at risk.
Deadline schedule
Illinois Mechanics Lien Deadlines (Updated 2026)
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| Deadline Type | Timing | Details |
|---|---|---|
| Preliminary/Notice | Notice of Intent to Lien — within 90 days of last furnishing | Required. |
| Special Notice | Within 60 days of starting work | For single-family owner-occupied projects. |
| Lien Filing | 4 months after completion | Must file lien by 4 months after completion. |
| Enforcement | 2 years after completion | Suit to enforce must be filed within 2 years after completion. |
| Statutes | 770 ILCS 60/7; 770 ILCS 60/21 |
Supplier pitfalls
Common Supplier Mistakes in Illinois
Missing the 90-Day Notice
Failing to send the Notice of Intent to Lien within 90 days of your last furnishing is a critical error.
Missing the 60-Day Residential Notice
On single-family owner-occupied projects, you must send notice within 60 days of starting work, not just 90 days from last furnishing.
Late Lien Filing
The lien must be filed 4 months after completion. Missing this deadline invalidates the lien.
Missing Enforcement Deadline
Enforcement must occur within 2 years after completion.
Deadline calculator
Not Sure Which Deadline Applies?
Use this Illinois guide and collect your project facts for qualified review.
Review Illinois project factsThe public calculator provides dates only for reviewed Florida and Kansas scenarios; it does not calculate a Illinois date.
Common questions
Frequently Asked Questions
When must the lien be filed?
4 months after completion.
What is the enforcement period?
2 years after completion.
What statutes apply?
770 ILCS 60/7; 770 ILCS 60/21.
When is the Notice of Intent to Lien due?
Within 90 days of last furnishing.
Is there a special rule for residential projects?
Yes, for single-family owner-occupied projects, notice is due within 60 days of starting work.
Important note