How to File a Mechanics Lien in Illinois
Step 1 — Confirm you have lien rights in Illinois
Illinois's recorded rules cover general contractors, subcontractors and suppliers, design professionals (770 ILCS 60/24). Each of those roles has its own filing window — see Step 3. Illinois rule detail: 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.
Step 2 — Send the Illinois preliminary notice
Illinois requires a preliminary notice 90 days (sub), 90-day sub notice (770 ILCS 60/7). It is a precondition, not a formality. It must reach County Recorder of Deeds and Owner and Owner / Prime Contractor (personally liable). Delivery: Certified Mail, Private Carrier with Tracking (FedEx/UPS) per IL HB 4660. Illinois rule detail: 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.
Step 3 — Your Illinois filing deadline
Illinois sets the window by claimant role: • General contractors: within 4 months of project completion, or within 2 years of your last day of work or materials. • Subcontractors and suppliers: within 4 months of your last day of work or materials, or within 2 years of your last day of work or materials. • Design professionals: within 4 months of your last day of work or materials. The clock runs from last date of furnishing — not your invoice date. Punch-list and warranty callbacks generally do not restart it. Illinois rule detail: 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.
Step 4 — Prepare and record the lien in Illinois
Record in the county where the property sits, under 770 ILCS 60/9. The document must identify the property, the owner of record, the amount actually owed, and what you furnished. Overstating the amount can void the claim outright. Illinois rule detail: 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.
Step 5 — Serve the recorded Illinois lien
Illinois requires service on County Recorder of Deeds and Owner and Owner / Prime Contractor (personally liable). Use Certified Mail, Private Carrier with Tracking (FedEx/UPS) per IL HB 4660 and keep the receipt. In many states an unserved lien is unenforceable even though it appears on title. Illinois rule detail: Suit to enforce within 2 years of recording. Name all interested parties.
Step 6 — Enforce before the Illinois deadline expires
You must sue to foreclose within 2 years (filing) (770 ILCS 60/34). Miss it and the lien expires and title clears, leaving only a contract claim. Illinois rule detail: 2 years from recording. Must intervene if prime already filed suit.
Retainage rules that affect your Illinois claim
Illinois treats retainage on its own schedule (815 ILCS 603/20), so money still held back may have a different due date than your progress billings. Illinois rule detail: 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.
Other Illinois requirements that void liens
• Prime must pay sub within 7 days of receiving payment from owner. Illinois Contractor Prompt Payment Act. File claim if not paid within 7 days of prime's receipt. • 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. • Design professionals (architects, engineers, surveyors) have full lien rights under the Illinois Mechanics Lien Act. Must record within 4 months of completing professional services. Same rules as contractor liens. • Illinois Construction Contract Funds Protection Act (Trust Fund Statute): Construction funds paid to contractor are trust funds for payment of subs/suppliers. If contractor diverts funds, personally liable for civil and criminal penalties. Sue within 2 years of diversion.
Frequently Asked Questions
How long do I have to file a mechanics lien in Illinois?
Illinois requires the lien to be recorded within 4 months, measured from last date of furnishing. The exact window depends on your role — general contractors: within 4 months of project completion, or within 2 years of your last day of work or materials.
Do I need to send a preliminary notice before filing in Illinois?
Yes. Illinois requires a preliminary notice 90 days (sub) (90-day sub notice). Failing to send it on time generally forfeits your lien rights entirely, regardless of how much you are owed.
Where do I file a mechanics lien in Illinois?
File with the county recorder's office in the county where the property is located. Filing in the wrong county does not preserve your deadline, and re-filing in the correct county after the deadline will not save the claim.
What happens if I miss the Illinois filing deadline?
Your lien rights are extinguished. Illinois courts do not grant extensions for missed mechanics lien deadlines. You would be left with a breach-of-contract claim against whoever hired you, which carries no security interest in the property and is far harder to collect.
How long does a mechanics lien last in Illinois?
Once recorded, you must file suit to enforce within 2 years (filing). If you do not, the lien expires automatically and no longer clouds the property's title.