Illinois Mechanics Lien Statute — 770 ILCS 60 Complete Guide
The Illinois Mechanics Lien Act at 770 ILCS 60 gives contractors 4 months to file and 2 years to enforce. The most dangerous trap is the Section 34 Demand — if an owner serves one and you miss the 30-day response window, your lien is forfeited permanently.
Illinois Mechanics Lien Act Overview — 770 ILCS 60
The Illinois Mechanics Lien Act (770 ILCS 60/0.01 et seq.) is the foundational statute governing mechanics lien rights for all construction parties in Illinois. It establishes who can file (contractors, subcontractors, material suppliers, and others who furnish labor or materials for the improvement of real property), what deadlines apply, and how liens are filed and enforced. Illinois is one of the few major states that does not require a preliminary notice as a condition of lien rights, making it more contractor-friendly than California, Texas, and Florida.
Illinois 4-Month Filing Deadline Under Section 7
Section 7 of the Illinois Mechanics Lien Act (770 ILCS 60/7) requires all mechanics lien claimants — contractors, subcontractors, and material suppliers — to file their lien with the Circuit Court Clerk within 4 months of the last date of furnishing labor or materials. This is an absolute deadline with no exceptions. Subcontractors must also serve a copy of the filed lien on the property owner within 5 days of filing.
The Section 34 Demand — The Most Dangerous Trap
Section 34 of the Illinois Mechanics Lien Act (770 ILCS 60/34) allows property owners and contractors to serve a demand on any lien claimant requiring them to commence enforcement of their lien within 30 days. If the lien claimant fails to file an enforcement lawsuit within 30 days of receiving this demand, the lien is automatically forfeited — even if the 2-year enforcement window has not yet expired. This Section 34 Demand is the most dangerous trap in Illinois lien law, and many contractors lose their lien rights by ignoring demand letters they receive in the mail.
Illinois 2-Year Enforcement Window
After filing an Illinois mechanics lien, the claimant has 2 years from the filing date to enforce the lien by commencing a lawsuit. Illinois's 2-year enforcement window is one of the more generous in the country, but it can be shortened to as little as 30 days by a Section 34 Demand. The combination of a generous enforcement period and the Section 34 trap makes monitoring all correspondence related to a filed lien critical.
Frequently Asked Questions
What is the mechanics lien deadline in Illinois?
The Illinois Mechanics Lien Act (770 ILCS 60) gives all claimants 4 months from the last date of furnishing labor or materials to file a mechanics lien with the Circuit Court Clerk.
What is the Section 34 Demand under 770 ILCS 60?
A Section 34 Demand is a formal demand served on a lien claimant requiring them to commence enforcement of their lien within 30 days. If the claimant fails to file a lawsuit within 30 days, the lien is permanently forfeited — even if the normal 2-year enforcement window has not expired.
Where do I file a mechanics lien in Illinois?
Illinois mechanics liens are filed with the Circuit Court Clerk in the county where the project property is located, not with the County Recorder. In Cook County, file with the Cook County Circuit Court Clerk.
Do I need to send a preliminary notice before filing a mechanics lien in Illinois?
No. Illinois does not require a preliminary notice. However, after filing the lien, subcontractors must serve a copy on the property owner within 5 days of filing.