Illinois Mechanics Lien Statutes: Deadlines, Venues & Citations
Where Illinois liens are filed and enforced
A Illinois mechanics lien is filed with the County Recorder of Deeds in the county where the project sits — 4 months from last date of furnishing. Filing in the wrong county does not perfect the claim, which matters on projects that straddle county lines. Those are two different clocks against two different offices, and Illinois claimants lose rights far more often by missing the second one than the first.
Illinois deadlines by claimant role
For subcontractors and suppliers: Notice to Owner — 90 days from last furnishing (770 ILCS 60/24); Notice to Owner — 60 days from first furnishing (770 ILCS 60/24); Record the lien — 4 months from last furnishing (770 ILCS 60/7); record lien fallback — 2 years from last furnishing (770 ILCS 60/7); file suit — 2 years from lien recorded (770 ILCS 60/9); file suit section34 demand — 30 days from receipt of section34 demand (770 ILCS 60/34). For general contractors: Record the lien — 4 months from project completion (770 ILCS 60/7); record lien fallback — 2 years from last furnishing (770 ILCS 60/7); file suit — 2 years from lien recorded (770 ILCS 60/9). For design professionals: Record the lien — 4 months from last furnishing (770 ILCS 60/1). Every window runs from the claimant's own dates, not the unpaid invoice date.
Rules specific to Illinois
COMMERCIAL: 90 days from last furnishing. Triggers owner withholding obligation. WARNING: Last date of furnishing does NOT include warranty work, punch list items, fixing defects, or equipment removal. Using the wrong date is heavily litigated in Illinois and can result in total loss of lien rights. RESIDENTIAL: 60 days from FIRST furnishing — must be sent near start of project to alert homeowner. Owner-occupied 1–4 unit residential. Unlike commercial (90 days from last furnishing), residential trigger is FIRST furnishing. WARNING: sending late means losing the notice right entirely. Prime must record lien within 4 months of completion. WARNING: 'Completion' does NOT include warranty work, punch list items, or fixing defects. Always record within 4 months for full priority protection. Sub/supplier must record lien within 4 months of own last furnishing. WARNING: Last date of furnishing does NOT include warranty work, punch list items, fixing defects, or equipment removal. Using the wrong date is heavily litigated in Illinois and can result in total loss of lien rights. FALLBACK OPTION: Recording after 4 months but within 2 years is still valid ONLY against the original owner. Loses priority over all third parties, subsequent purchasers, and mortgagees recorded after construction began. Always record within 4 months for full protection. Suit to enforce within 2 years of recording. Name all interested parties. 2 years from recording. Must intervene if prime already filed suit. CONDITIONAL OVERRIDE: If owner serves Section 34 Demand, the 2-year suit deadline is immediately replaced by 30 days from receipt of demand. Missing this extinguishes the lien permanently. App must ask user if they received this demand.
How Illinois notices must be served
Illinois requires 90 days (sub) — 90-day sub notice. Accepted delivery for the notices tracked here: Certified Mail, Private Carrier with Tracking (FedEx/UPS) per IL HB 4660; Written notice per contract; Certified Mail, Return Receipt Requested. Service runs to the Owner. Keep the proof of service in the project file — Illinois disputes over whether a notice was properly served are decided on that documentation.
Public projects in Illinois
No lien attaches to public property in Illinois. On private residential and public state local and public federal work the remedy is a payment bond claim instead — Notice to Owner within 60 days of first furnishing, served on the Owner (770 ILCS 60/24). 10 public-project deadlines are tracked for Illinois.
Illinois statute citations
The Illinois deadlines above come from 770 ILCS 60/24, 770 ILCS 60/7, 770 ILCS 60/9, 770 ILCS 60/34, 30 ILCS 550/2, 40 U.S.C. § 3133(b)(2), 40 U.S.C. § 3133(b)(1), 815 ILCS 603/10, 815 ILCS 603/20, 770 ILCS 60/23, 770 ILCS 60/1, 815 ILCS 608/1 et seq., 770 ILCS 60/21. Statutes are amended periodically — verify current text before relying on any date, and consult a licensed Illinois construction attorney on a specific project.
Frequently Asked Questions
How long do you have to file a mechanics lien in Illinois?
4 months — From last date of furnishing. The filing goes to the County Recorder of Deeds in the project's county. See 770 ILCS 60/7. The clock runs from the claimant's own last furnishing or completion, not the invoice date.
Where do you file a mechanics lien in Illinois?
With the County Recorder of Deeds in the county where the property is located. Recording in the wrong county does not perfect the lien.
Does Illinois require a preliminary notice?
Yes — 90 days (sub). 90-day sub notice. Accepted service includes Certified Mail, Private Carrier with Tracking (FedEx/UPS) per IL HB 4660.
How long do you have to enforce a Illinois mechanics lien?
2 years — From filing. A recorded lien left unenforced past that window generally expires and can expose the claimant to slander-of-title risk if it stays on record.
When must retainage be released in Illinois?
Retainage must be released within 30 days of substantial completion. Maximum 10% retainage; reduces to 5% at 50% completion. Do not accept retainage reductions in exchange for lien waivers. (815 ILCS 603/20).