Last updated: March 2026
Overview: Subcontractor Deadlines Under the Illinois Mechanics Lien Act
Unlike general contractors who contract directly with the property owner, subcontractors in Illinois must navigate additional notice requirements to preserve their mechanic lien rights. The Illinois Mechanics Lien Act (770 ILCS 60) imposes a series of strict, time-sensitive deadlines on subcontractors. Each deadline serves a distinct purpose, and each must be met independently — complying with one does not excuse missing another.
The four critical deadlines every Illinois subcontractor must know are:
For the complete list of all deadlines (including those for general contractors and suppliers), see our Illinois mechanic lien deadlines page. Use our deadline calculator to estimate your specific dates.
60-Day Residential Notice Requirement
Under 770 ILCS 60/5 and 60/21, subcontractors working on owner-occupied single-family residences must serve written notice on the property owner within 60 days of first furnishing labor or materials. This notice informs the homeowner that the subcontractor is working on their property and may have lien rights.
When It Applies
The 60-day notice is required only when the project involves an owner-occupied, single-family residence. It does not apply to commercial projects, multi-family buildings, or residences where the owner does not live in the property.
If a subcontractor fails to serve this notice within 60 days, lien rights on that residential project are waived. For a detailed explanation, see our 60-day residential notice guide.
Trigger: First date subcontractor furnishes labor or materials
Deadline: 60 days from first furnishing
Consequence of missing: Complete waiver of lien rights on that project
90-Day Section 24 Notice
Section 24 of the Mechanics Lien Act (770 ILCS 60/24) requires every subcontractor who does not have a direct contract with the property owner to serve written notice on the owner within 90 days of their last date of furnishing labor or materials. This is arguably the most critical subcontractor deadline — failure to comply results in a complete loss of lien rights.
The Section 24 notice must include the subcontractor's name, a description of the labor or materials furnished, the amount of the contract or the amount claimed, and a description of the property. The notice must be served on the owner — not the general contractor. Service may be made personally, by registered or certified mail, or by any method reasonably calculated to give actual notice.
Why Timing Matters
A subcontractor's lien is generally limited to the amount the owner owes the general contractor at the time the Section 24 notice is received. If the owner has already paid the general contractor in full before receiving the Section 24 notice, there may be nothing left to secure the subcontractor's lien — even if the general contractor owes the subcontractor money.
This means early service of the Section 24 notice is strategically critical. The earlier you serve the notice, the more likely it is that the owner still has funds to withhold from the general contractor. Learn more about Section 24 notice requirements.
Trigger: Last date subcontractor furnishes labor or materials
Deadline: 90 days from last furnishing
Consequence of missing: Complete waiver of lien rights
4-Month Lien Recording Deadline
Under 770 ILCS 60/7, a subcontractor must record the mechanic lien claim with the county recorder of deeds within four months of the subcontractor's last date of furnishing labor or materials. This is the same deadline that applies to general contractors, but the starting point — "last furnishing" — is measured individually for each subcontractor based on when that subcontractor last performed work or delivered materials.
The lien claim must include the subcontractor's name and address, the property owner's name, a complete legal description of the property, a description of the work or materials furnished, the amount claimed, the dates of first and last furnishing, and must be verified by affidavit. Even minor errors can invalidate the lien under Illinois's strict compliance standard.
Important: Punch-list work, warranty repairs, and return visits to fix defects generally do not extend the "last furnishing" date. Courts look at whether the work added new value to the improvement. Use our deadline calculator to check your dates.
For a detailed explanation of the recording process and what the lien claim must contain, see our 4-month recording deadline guide.
Trigger: Last date subcontractor furnishes labor or materials
Deadline: 4 months from last furnishing
Consequence of missing: Loss of lien priority against lenders, encumbrancers, and third-party purchasers
2-Year Enforcement/Foreclosure Deadline
Recording the lien is not the final step. Under the Illinois Mechanics Lien Act, a subcontractor must file a foreclosure lawsuit within two years of the date of last furnishing labor or materials to enforce the lien. If the subcontractor does not file suit within this period, the lien expires by operation of law and cannot be revived.
This deadline can be dramatically shortened if the property owner serves a Section 34 demand — which compresses the enforcement deadline to just 30 days. If the subcontractor fails to file suit within 30 days of receiving a valid Section 34 demand, the lien is forfeited.
Trigger: Last date subcontractor furnishes labor or materials
Deadline: 2 years from last furnishing (or 30 days after Section 34 demand)
Consequence of missing: Lien expires and cannot be enforced
Steps to Protect Your Subcontractor Lien Rights
The Illinois Mechanics Lien Act is a strict compliance statute. Courts will not excuse missed deadlines or defective notices, even if the subcontractor is otherwise owed money. To maximize your chances of recovering payment, follow these steps from the start of every project:
Document your first and last dates of furnishing labor or materials on every project. These dates control all of your deadlines.
Determine immediately whether the project is a single-family owner-occupied residence — if so, serve the 60-day residential notice right away.
Serve the Section 24 notice on the property owner as early as possible — do not wait until the 90-day deadline approaches. Earlier notice means more funds may be available to secure your lien.
Track the 4-month recording deadline from your last date of furnishing. Record the lien claim well before the deadline — do not wait until the last week.
After recording the lien, send a copy to the property owner within 30 days as required by 770 ILCS 60/7.
Monitor for a Section 34 demand from the owner. If you receive one, you have only 30 days to file a foreclosure lawsuit or the lien is forfeited.
File the foreclosure lawsuit within 2 years of last furnishing — or within 30 days if a Section 34 demand has been served.
Consult with an experienced mechanic lien attorney early. The cost of professional guidance is far less than the cost of losing lien rights due to a procedural misstep.
For more on subcontractor lien rights and the complete lien process, see our Illinois mechanic liens overview. If you need help determining your deadlines, an experienced mechanic lien attorney can evaluate your situation.
Subcontractor Deadline Timeline Summary
Serve residential notice (owner-occupied single-family only)
From first furnishing · If missed: Lien rights waived on that project
Serve Section 24 notice on property owner
From last furnishing · If missed: Complete loss of lien rights
Record lien claim with county recorder
From last furnishing · If missed: Loss of lien priority
File foreclosure lawsuit
From last furnishing · If missed: Lien expires by operation of law