Illinois Mechanics Lien Act: Deadlines, Notices, and Enforcement

The Illinois Mechanics Lien Act, codified at 770 ILCS 60, gives contractors, subcontractors, material suppliers, and certain design professionals a security interest in real property they have improved but not been paid for. That security interest can eventually force a sale of the property. It also comes with short deadlines and precise notice rules, and Illinois courts enforce those rules strictly: a legitimate debt can lose its lien protection over a missed filing or a defective notice.

Who Can Claim a Lien and What It Covers

The Act reaches anyone who contracts with the property owner, or with someone the owner authorized, to improve real property. That includes general contractors, subcontractors, material suppliers, architects, engineers, surveyors, and property managers.¹ “Improve” is defined broadly and covers new construction, remodeling, landscaping, excavation, well drilling, and form work for concrete.

The lien attaches to the whole lot or tract where the work was done, plus any adjoining or adjacent land the owner uses as part of the same residence or business. It covers labor, materials, fixtures, services, and machinery, and it carries interest at 10% per year from the date payment became due.¹ Importantly, the lien attaches as of the date of the contract, not the date it is recorded. That contract date drives priority disputes later.

Deadlines to Record and Enforce the Lien

To protect lien rights against third parties (later buyers, lenders, or other creditors), a contractor must act within four months of completing the work. Within that four-month window, the contractor must either record a lien claim with the county recorder in the county where the property sits, or file a lawsuit to enforce the lien.² If extra work is performed after the original scope wraps up, the four-month clock restarts from the completion of that additional work.

Against the property owner alone (setting aside third parties), a claim can be recorded any time after the contract is made and up to two years after the contract is completed. That longer window only helps if no one else is going to buy the property or take a mortgage on it in the meantime. Once the four months expire, the lien becomes unenforceable against anyone who later takes an interest in the property.²

The recorded claim must be verified by the claimant’s affidavit and must include a brief description of the contract, the balance due after all credits, and a description of the property sufficient to identify it.² Honest errors or overcharges don’t defeat the lien; only an amount inflated with intent to defraud does.

Extra Step for Owner-Occupied Homes

When the property is an owner-occupied single-family home, the contractor has 10 days from recording to send written notice of the lien to the owner.³ If the contractor skips that notice and the owner suffers actual damages before finding out, the lien can be reduced or eliminated by the amount of those damages. Simply recording the lien is not itself a “damage.” This rule applies only to contractors, not to subcontractors.

Notice Rules for Subcontractors

Subcontractors and material suppliers have their own lien rights, but with notice duties the general contractor doesn’t face. Defective or late notice is the single most common way subcontractors lose an otherwise valid lien.

The 90-Day Notice to the Owner

Every subcontractor must send a written notice of the claim to the property owner (or the owner’s agent, architect, or construction superintendent) and to the lending agency, if known, within 90 days after completing their portion of the work.⁴ Extra work performed after the original scope opens a new 90-day window from the completion of that additional work. The notice must identify the contract, describe the work, and state the amount due or becoming due. It must be delivered by certified or registered mail with return receipt, a nationally recognized delivery service with tracking, or personal service.

The 90-day notice is not strictly required when the general contractor’s sworn statement already lists the subcontractor and the correct amount owed. But if the sworn statement is wrong, the subcontractor is protected only up to the figure shown on it. Most experienced subcontractors send the notice regardless.⁴

The 60-Day Residential Notice

Subcontractors working on an existing owner-occupied single-family home have an additional, earlier duty. They must notify the homeowner within 60 days of first starting work or delivering materials.⁵ The notice goes out by personal delivery or certified mail and must state the subcontractor’s name and address, the date work started, the type of work being performed, and the name of the contractor who hired them.

The notice must also carry a specific warning in at least 10-point bold type telling the homeowner that the subcontractor can file a lien if the general contractor doesn’t pay, and urging the homeowner to request lien waivers from the contractor with each payment.⁵ A late notice doesn’t destroy the lien outright, but it caps recovery: the subcontractor can lien only for amounts the owner hadn’t yet paid out when the notice arrived.

How Much a Subcontractor Can Lien For

A subcontractor’s lien draws from the same pool of money as the general contract. Ordinarily, the owner can’t be forced to pay more than the original contract price on account of subcontractor liens.⁵ The exception is when the owner made payments that violated the Act, such as paying the general contractor without first getting the sworn statement. In that scenario, the owner’s exposure can exceed the contract price.

The Sworn Statement Requirement

Before any payment changes hands, the general contractor must give the owner a sworn statement listing every subcontractor and supplier on the project and the amounts due or about to become due to each.⁶ The owner has a matching duty to demand the statement before making any payment. Paying without it exposes the owner: those payments can be disregarded against later subcontractor lien claims.

For owner-occupied single-family residences, the contractor must also give the owner a separate printed notice, in at least 10-point bold type, before the first payment, telling the owner that the law requires the sworn statement before any payments are made.⁷ That requirement took effect January 1, 2025.

Enforcing the Lien

Recording the lien is only the first step. To collect, the lienholder has to file a foreclosure lawsuit in the circuit court of the county where the property sits. The suit asks the court to recognize the lien, fix the amount owed, and, if the debt isn’t paid, order a judicial sale.

The lienholder must show compliance with each procedural requirement: proper recording, timely notices, and accurate claim amounts. The court accounts for any payments already made and weighs any defenses the owner raises. If the lienholder wins, sale proceeds go first to satisfy valid claims against the property.

Interest runs at 10% per year from the date payment became due, not from the recording or lawsuit date.¹ On a large unpaid balance, that clock alone can push both sides toward settlement.

Attorney’s Fees

Mechanics lien cases carry a fee-shifting rule that most Illinois civil cases don’t have. If the court finds the owner failed to pay the full contract price without just cause, it can order the owner to pay the lienholder’s reasonable attorney’s fees. The reverse also applies: a lienholder who pursues a claim without just cause can be ordered to pay the owner’s fees. “Without just cause or right” means the claim or defense was not grounded in fact and not supported by existing law or a good-faith argument to change it.⁸

Owner Defenses and Forcing the Issue

Illinois courts treat the Act as a strict-compliance statute at the procedural stage. Once compliance is established, courts interpret the Act liberally to protect people who improve property in good faith. Until then, an owner has real leverage.

Common defenses include:

Missed deadlines. The four-month recording window, the 90-day subcontractor notice, and the 60-day residential notice are hard deadlines, and late filing is the simplest defense to prove.
No contractual relationship. The claimant must have contracted with the owner or someone the owner authorized; a sub-subcontractor whose only agreement runs to a subcontractor without owner authority may have no lien.
Overstated amounts. Honest errors are protected, but a deliberate overcharge intended to defraud can void the entire lien.
Prior payment. If the owner paid the general contractor in full before receiving notice of a subcontractor’s claim, the subcontractor’s recovery may be limited or eliminated, particularly on owner-occupied homes where the 60-day notice wasn’t sent.

Lien waivers matter too. A partial or final waiver signed in exchange for a progress or final payment can be raised as a defense against a later lien claim covering the same work. Owners should collect waivers from every tier at each payment; subcontractors should be cautious about signing waivers before the check clears.

Forcing the Lienholder to Sue

A recorded lien clouds title and can block a sale or refinancing. Under Section 34, an owner or other interested party can serve a written demand on the lienholder requiring them to file suit within 30 days.⁹ If the lienholder doesn’t file within that window, the lien is forfeited entirely.

The demand must go by certified or registered mail with return receipt, or by personal service, and it must contain a specific warning in at least 10-point bold type stating that failure to respond within 30 days will forfeit the lien.⁹ It is one of the most effective tools an owner has against a stale or questionable lien.

Substituting a Bond to Clear Title

When the dispute will take time to resolve but the owner needs the title cleared, Section 38.1 allows an owner or other interested party to remove the lien from the title by posting a surety bond in its place. The bond must equal 175% of the claim amount, excluding interest and attorney’s fees.¹⁰

The surety must hold a certificate of authority from the Illinois Department of Insurance and carry an A.M. Best financial strength rating of at least A (no modifier), a positive or stable outlook, and a financial size category of at least IX. If the property lies in a judicial circuit that maintains its own approved surety list, the bond has to come from a company authorized for that circuit.¹⁰

The petitioner files a verified petition with the circuit court and attaches the proposed bond and the surety’s certificate. The lienholder gets notice and has 30 days to object. Once approved, the lien shifts from the property to the bond, freeing the title while the payment fight continues in court.

Priority Against Mortgages

When multiple parties claim against the same property, mechanics liens sit in an unusual spot. Under Section 16, even a mortgage recorded before the construction contract was signed takes priority only up to the value of the land at the time the contract was made. The mechanics lien creditor takes priority over all improvements made after the contract date.¹¹

In practice, the court separates the property’s value into two pieces: the pre-improvement land value and the value of the improvements. Existing mortgages get first claim on the pre-improvement value; mechanics lien holders get first claim on the improvement value. On a foreclosure sale, the court fixes those proportions and distributes proceeds accordingly.

Public Projects: No Lien on the Land

You can’t place a mechanics lien on government-owned property. If you supplied labor or materials on a public project, Section 23 gives you a different remedy: a lien on the public funds owed to the contractor. The rule covers projects for counties, townships, school districts, municipalities, other units of local government, and state agencies.¹²

To claim against public funds, you must send a written notice with a sworn statement to the appropriate government clerk or secretary before the money is paid to the contractor, and send a copy to the contractor. The notice identifies the contract, describes the work, and states the total amount due. The lien attaches only to funds not yet disbursed when the notice arrives.¹² If several claimants file against the same pot of money, everyone shares proportionally based on what they’re owed. For state projects, the notice triggers a 90-day hold, and if you’re not paid within that period you must file suit within those 90 days and notify the department within 10 days of filing.¹³

1
Illinois General Assembly. Illinois Code 770 ILCS 60/1 – Contractor Defined; Amount of Lien
2
Illinois General Assembly. Illinois Code 770 ILCS 60 – Mechanics Lien Act – Section 7(a)
3
Illinois General Assembly. Illinois Code 770 ILCS 60 – Mechanics Lien Act – Section 7(d)
4
Illinois General Assembly. Illinois Code 770 ILCS 60/24 – Written Notice by Subcontractor
5
Illinois General Assembly. Illinois Code 770 ILCS 60/21 – Subcontractor Defined; Lien of Subcontractor; Notice
6
Illinois General Assembly. Illinois Code 770 ILCS 60 – Mechanics Lien Act – Section 5
7
Illinois General Assembly. Illinois Code 770 ILCS 60 – Mechanics Lien Act – Section 5(b)(i)
8
Illinois General Assembly. Illinois Code 770 ILCS 60/17 – Attorney Fees
9
Illinois General Assembly. Illinois Code 770 ILCS 60/34 – Notice to Commence Suit
10
Illinois General Assembly. Illinois Code 770 ILCS 60/38.1 – Substitution of Bond for Lien
11
Illinois General Assembly. Illinois Code 770 ILCS 60 – Mechanics Lien Act – Section 16
12
Illinois General Assembly. Illinois Code 770 ILCS 60 – Mechanics Lien Act – Section 23
13
Illinois Department of Transportation. Mechanics Lien and Bond Claims