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A mechanic's lien is a legal document used by contractors, subcontractors, and suppliers to secure payment for work completed on a construction project. Filing a mechanic's lien essentially states that:
- You're owed money for services provided
- You're expecting payment by a specific date
- You'll proceed with litigation if you don't receive payment by that date
While a lien is in place, it restricts the owner from selling, refinancing, or transferring the property without paying you. That pressure makes liens one of the most powerful payment tools available—especially for subcontractors and suppliers.
Mechanic's lien laws vary significantly by state, with different rules governing who can file a lien, what notices are required, and timelines for filing and enforcement. This guide covers the essentials of Illinois's mechanic's lien laws to help you protect your right to payment.
Not required
Owner-occupied, single-family residences: Required within 60 days of starting work/supplying materials
Not required in any other situations
Owner-occupied, single-family residences: Required within 60 days of starting work
Not required in any other situations
Not required
Required within 90 days after the last furnishing of labor/materials
Required within 90 days after the last furnishing of labor
Within 4 months after the last day of work
If a lien is filed after 4 months, but before 2 years after completion of work, the lien remains enforceable against the original owner
Within 4 months after the last furnishing of work/materials
If a lien is filed after 4 months, but before 2 years after completion of work, the lien remains enforceable against the original owner
Within 4 months after the last day of work
If a lien is filed after 4 months, but before 2 years after completion of work, the lien remains enforceable against the original owner
Within 2 years after project completion, but can be shortened to 30 days if the owner submits a demand to commence suit
Within 2 years after project completion, but can be shortened to 30 days if the owner submits a demand to commence suit
Within 2 years after project completion, but can be shortened to 30 days if the owner submits a demand to commence suit
Unpaid balance of labor, services, and materials
Unpaid balance of labor, services, and materials
Unpaid wages
Governed by the Illinois Mechanics Lien Act, 770 ILCS 60/1 through 60/39, Illinois’s mechanic’s lien rights only apply to private construction projects. (Public property cannot be liened. If you’re unpaid on a public job, payment disputes are handled through the project’s payment bond.)
There are two big timing rules to keep in mind in Illinois.
Lien filing runs on two clocks: filing within four months of finishing your work protects your lien against lenders and later buyers, while filing after four months—but within two years—still preserves rights against the original owner (770 ILCS 60/7(a)).
Even if you’re within that window, an owner or other interested party can force the issue by serving a demand that requires you to file a lawsuit within 30 days or lose the lien altogether (770 ILCS 60/34).
With that in mind, let’s walk through how Illinois lien rights actually work.
In Illinois, mechanic's lien rights extend to any person who is contracted, either written or implied, to improve or manage the construction of a “lot or tract of land.” This includes:
- General (original) contractors
- Subcontractors and lower-tier subcontractors
- Material and equipment suppliers, vendors, and machinery providers
- Laborers, mechanics, and other on-site workers
- Architects, structural engineers, professional engineers, land surveyors, registered interior designers, and property managers
- Superintendents and time-keepers
To be eligible for a mechanic's lien in Illinois, your work must “improve” a property. Here are some examples of what’s considered lienable work and what isn’t.
Lienable Work in Illinois
- Furnishing labor, services, material, fixtures, apparatus, or machinery
- Forms or forms work using concrete (or like) material
- Building, altering, repairing, or ornamenting structures and related improvements
- Walks, sidewalks, driveways, fences, and appurtenances connected to the premises
- Excavation, fill, sod, and landscaping work
- House raising, lowering, or removal
- Architectural, surveying, interior design, or property management services
- Water well drilling
- Work on boats, barges, watercraft, and mobile homes
Non-Lienable Work in Illinois
- Work on public projects
- Supplies provided to another supplier that are not used on the job site
- Certain equipment rental on single-family residences and multi-family buildings with fewer than 12 units
Before filing a lien in Illinois, make sure you’ve met any notice or preliminary requirements that apply to your role (see table above).
Deadline to File
To fully protect lien rights against lenders and later buyers, a Claim for Lien must be recorded within 4 months after the last day that labor or materials were provided.
A lien may still be recorded up to two years after project completion, but a lien filed after the four-month mark is enforceable only against the original owner, not third parties (like lenders or purchasers) (770 ILCS 60/7(a)).
Filing Requirements
- Filing location: Office of the recorder of deeds in the county where the property is located.
- Form requirements: The Claim for Lien must substantially follow the guidance provided under 770 ILCS § 60/7:
- Brief statement of the claimant’s contract
- Amount of lien claim after all credits have been given
- General property description (e.g., address)
- Verification: An Illinois Claim for Lien must be notarized, and verification is required by affidavit (770 ILCS 60/7(a)).
- Filing fee: The recorder’s statutory fee is $12 for the first four pages, plus $1 per additional page, plus $1 for each additional document number noted (770 ILCS 60/38).
Service Requirements
- GCs on residential jobs: You must send the owner written notice via mail or personal delivery within 10 days after recording the lien. If the notice is late, the lien isn’t automatically invalid, but it can be reduced if the owner can show they were harmed by the delay (770 ILCS 60/7(d)).
- Everyone else: Illinois doesn’t have a general rule requiring you to “serve” a recorded lien on all parties. For most subcontractors and suppliers, notice happens before the lien is filed—like the 90-day notice of claim—not by serving the recorded lien itself.
Recording a lien preserves your rights—but enforcement is how you get paid. Here’s what you must do to ensure you enforce your lien in Illinois.
Enforcement Requirements
- Enforcement deadline: A suit to enforce must be commenced within two years after the contractual end date, the last day of work completed, or the last day that materials were furnished. If the owner serves the claimant a written demand to enforce the lien, this window shrinks to 30 days (770 ILCS 60/34).
- Filing location: Circuit court in the county where the property is located.
- Lien priority: Illinois sets lien priority in a few straightforward ways. Unpaid wages come first, so laborers get paid before everyone else. Among contractors, subcontractors, and suppliers, there’s generally no advantage to being first in time; liens share priority, aside from the wage preference.
Lien Release Requirements
After the lien is paid or otherwise satisfied, the lien claimant must provide a written satisfaction or release upon written demand and record it with the county recorder. Failure to release within 10 days after demand can trigger a $2,500 penalty plus costs and reasonable attorney’s fees (see 770 ILCS 60/35).
- Unified workflow: Manage lien rights within your billing and collections workflow to keep payment context in one place.
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Illinois lien law does not forbid unlicensed contractors from filing mechanic’s liens. However, it’s best practice to obtain a license to avoid legal complications and project setbacks.
Yes, anyone working on the project, from GCs to subcontractors to laborers to suppliers, is entitled to file a mechanic’s lien in Illinois.
Yes, enforcement can be accelerated. Even though the normal enforcement deadline is up to two years after completion, an owner (or other interested party) can serve a written demand that forces you to file suit (or answer in a pending case) within 30 days, or the lien is forfeited (770 ILCS 60/34).
Though it’s not technically called a Notice of Intent, most subcontractors, suppliers, and laborers must send the owner a written notice of claim within 90 days of completing their work to fully protect their lien rights.
This notice tells the owner (and lender, if known) who is owed money and for what. It must:
- Be delivered to the owner or their representative by registered or certified mail, a delivery company with tracking, or personal delivery.
- Clearly identify the project, the work performed, and the amount due.
Illinois law provides an example notice form in 770 ILCS 60/24.
If payment isn’t made within 10 days of serving the notice, the claimant can move forward with recording and enforcing a mechanic’s lien.
The only folks who need to worry about submitting a preliminary notice are subcontractors, suppliers, and laborers working on an owner-occupied single-family residence. This preliminary notice must be sent via certified mail or personal delivery within 60 days of starting work or first supplying materials.
The notice should contain:
- Subcontractor, supplier, or laborer’s name and address
- Work and/or supply delivery start date
- Nature of work performed or supplies delivered
- Name of contractor requesting the work
- Warning in at least 10-point bold type following the text in ILCS § 60/21
Separately, GCs must provide a sworn statement listing subcontractors and amounts due before receiving payment from the owner. These statements regulate payment, though, not lien rights (770 ILCS 60/1(a); 770 ILCS 60/5).
There’s no specific lien waiver form to complete in Illinois. Clearly state the amount being waived and the applicable property for work performed. For more information, review our Illinois lien waiver guide here.
At a baseline, Illinois liens cover lienable labor, services, and materials provided to the improvement.
Additionally, Illinois lien law stipulates that parties can lien for interest on the amount due at an annual rate of 10% starting from the payment due date. Prevailing parties in legal disputes will be awarded “reasonable attorney’s fees” as well.
The Illinois Mechanics Lien Act refers to “any person who shall by any contract or contracts, express or implied, or partly express or implied” as eligible to file a mechanic’s lien in the state. A written contract isn’t required here, but based on best practices, it might be a good move to safeguard your rights throughout the project.
Disclaimer: This guide is for informational purposes only and does not constitute legal advice. Always consult with a qualified construction attorney in your state regarding specific legal matters before taking any action that could affect your lien rights.