Illinois Mechanic Lien Deadlines

When to File a Claim for Mechanic Lien (770 ILCS 60/7)

Under the Illinois Mechanics Lien Act, a Claim for Mechanic Lien may be filed with the county any time after the contract is entered into. However, timing affects the mechanic lien's priority and enforceability against different parties.

General Contractor — Filing Timelines

General contractors have two distinct filing windows under 770 ILCS 60/7. To protect their mechanic lien against innocent third-party purchasers, the mechanic lien must be filed within 4 months after completion of work or final delivery of materials. This provides the strongest priority position, relating back to the commencement of the improvement.

Against the original owner, the mechanic lien remains valid if filed within 2 years from the last date of furnishing labor or materials. Mechanic Liens filed after 4 months but within 2 years have reduced priority and may be subordinate to subsequent mortgages and purchasers.

Subcontractor & Material Supplier — Filing Timelines

Subcontractors and material suppliers follow similar timelines under 770 ILCS 60/7. Against third parties, the mechanic lien must be filed within 4 months after completion of work or final delivery. Against the original owner, the mechanic lien may be filed within 2 years after completion of work, additional work, or final delivery.

The subcontractor must also have served the required 90-Day Notice (770 ILCS 60/24) before recording. Suit to enforce the lien cannot be commenced until 10 days after service of that notice (770 ILCS 60/28), but the Claim for Lien itself may be recorded as soon as the notice is served.

Strict Compliance — Common Pitfalls That Invalidate Mechanic Liens

Illinois courts demand strict compliance with every element of the mechanic lien claim. Even a minor technical error can result in complete forfeiture of your payment rights. Common pitfalls that can invalidate your mechanic lien include:

• Incorrect Property Address: Using only a street address instead of the correct legal description or the 14-digit Property Index Number (PIN)
• Combining Lienable and Non-Lienable Work: Not all costs are lienable — Section 1 of the Act (770 ILCS 60/1) sets forth eligible categories. However, if the claim includes both lienable and non-lienable work, the mechanic lien may still be valid if the amount is not fraudulently overstated (770 ILCS 60/7)
• Overstating Mechanic Lien Amounts: Including speculative future costs or attorney fees not contractually agreed upon, which triggers a "fraudulent overstatement" defense
• Allocation and Apportionment Issues: Projects on two or more lots or tracts of land, or involving more than one building, may require proper allocation and apportionment of the mechanic lien amount
• Improper Service: Failing to serve notices on owners or lenders within strict timelines

Verified Mechanic Lien Claim Requirements

Illinois requires that all mechanic liens be verified by affidavit and must include:

• A brief, accurate statement of the contract
• The balance due after all credits and offsets
• A sufficiently correct description of the property (often requiring a legal description to be fully effective)
• Correct identification of all owners and parties in interest
• The name of the party with whom the claimant contracted
• A description of the labor or materials furnished
• The dates of first and last furnishing
• Verification by the claimant under oath

Private Mechanic Liens vs. Public Mechanic Liens

Mechanic's liens in Illinois operate differently depending on who owns the property. Private mechanic liens (770 ILCS 60/1) attach directly to the real estate, allowing you to eventually foreclose on the property to satisfy the debt.

Public mechanic liens (770 ILCS 60/23) work differently — on public projects such as schools or municipal buildings, you cannot mechanic lien the land. Instead, your mechanic lien attaches to the "public funds" due to the general contractor, effectively "trapping" those funds until your claim is resolved.

Recording at the County Recorder

The verified mechanic lien claim must be recorded with the Recorder of Deeds in the county where the property is located. Each county has specific requirements for recording mechanic's liens — compliance with the precise standards of the county recorder is essential to prevent technical rejections that could jeopardize your 4-month perfection deadline.

For owner-occupied single-family residences, 770 ILCS 60/7 requires the contractor or subcontractor to give the owner written notice within 10 days after recording the lien. This post-recording notice does not apply to commercial or non-owner-occupied residential projects.

Relation-Back Priority Rules

Illinois mechanic liens filed within the 4-month priority window relate back to the date of commencement of the improvement. This relation-back doctrine gives timely-filed mechanic liens priority over mortgages and other encumbrances that were recorded after construction began.

Mechanic Liens filed after the 4-month priority period do not receive relation-back priority and take effect only from the date of recording.

Condominium Mechanic Lien Allocation

When the property being liened is a condominium, the mechanic lien requires "allocation" and "apportionment." The total debt must be spread across individual units and their respective common interests. Failure to properly allocate the mechanic lien amount across units can invalidate the mechanic lien.

Oral Contracts and Equipment Lessors

While a written contract is always preferred, Illinois law does allow for mechanic liens based on oral contracts, provided you can prove the agreement and the value of the work performed. Equipment lessors generally have mechanic lien rights on commercial projects; however, they generally do not have mechanic lien rights on residential projects involving fewer than 12 units.