Written by the attorneys of CTM Legal Group | Illinois Advocates, LLC d/b/a CTM Legal Group | Chicago, Illinois | Updated March 2026

CTM Legal Group is a Chicago-based litigation firm representing contractors, subcontractors, suppliers, and property owners in Illinois mechanics lien matters. Our attorneys have handled lien disputes across Cook, DuPage, Kane, Will, Lake, McHenry, and Kankakee Counties.

What Is a Mechanics Lien?

If you have ever hired a contractor to renovate your kitchen and later received a legal notice saying a lien was placed on your home — or if you are a contractor who completed a job and never got paid — you have already encountered the world of mechanics liens, whether you realized it or not.

A mechanics lien is a legal claim against real property that protects contractors, subcontractors, and suppliers who performed work or provided materials to improve that property but were not paid. Under Illinois law (770 ILCS 60/, the Illinois Mechanics Lien Act), the unpaid party can attach their claim directly to the real estate — which means the property cannot easily be sold or refinanced until the dispute is resolved.

The law exists to prevent an unfair result: someone improves your property, adds real value to it, and walks away with nothing. At the same time, the Act includes strict deadlines and notice requirements to protect property owners, lenders, and subsequent purchasers from surprise encumbrances.

Because a mechanics lien is a purely statutory creation that exists in derogation of common law, Illinois courts require strict compliance with the requirements for perfecting a lien — only after a lien is properly perfected do courts apply a more liberal construction to enforcement remedies.

Who Can File a Mechanics Lien in Illinois?

Illinois law recognizes two main categories of lien claimants. Understanding which category you fall into matters enormously — the rules, deadlines, and notice requirements are different for each.

General Contractors (Section 1)

Under 770 ILCS 60/1(a), a general contractor is any person who enters into a contract — express, implied, or partly expressed — with the owner of a lot or tract of land, or with someone the owner has authorized or knowingly permitted to contract. Even without a signed contract, an owner who was aware of improvements and failed to object may be subject to a lien. The contractor's lien attaches to the property as of the date the contract was formed, giving the contractor strong priority against later-recorded encumbrances.

Subcontractors and Suppliers (Section 21)

A subcontractor under 770 ILCS 60/21 is anyone hired by the general contractor rather than directly by the owner — specialty trades, material suppliers, equipment providers. Subcontractors have two points of attachment: their lien attaches to the real estate and to any money due or about to become due from the owner to the general contractor. This allows a subcontractor to effectively freeze payments to a general contractor when a dispute arises.

What Work Qualifies as a Lienable Improvement?

Section 1(b) defines "improve" broadly, encompassing labor, services, materials, fixtures, or machinery used in building, altering, repairing, or ornamenting any structure. Lien rights extend beyond traditional construction to:

• Architects, structural engineers, professional engineers, and land surveyors
• Preparatory work such as grading, site surveys, and subdivision plat preparation (even if no structure is ultimately built, provided the work produced a calculable increase in market value or was part of a recorded plat)
• Equipment lessors, provided the equipment was used on-site for a specific project (note: Section 1.2 excludes single-family and small multi-family residences from equipment liens)
• Material suppliers and fixture providers

Work that generally does not qualify includes pure feasibility studies, routine maintenance and upkeep services, and freestanding personal property removable without structural damage.

Critical Deadlines You Cannot Miss

Mechanics lien law is, above almost anything else, a law of deadlines. Illinois courts apply these deadlines strictly and without exception.

What Counts as the "Last Date of Work"?

Both the four-month contractor deadline and the 90-day subcontractor deadline run from the "last date of work" — a deceptively simple phrase that is frequently litigated. The last date of work means the last day on which the claimant performed lienable work that was billable under the contract.

The following types of activity generally do not qualify and cannot be used to extend the deadline:

• Repairing the claimant's own defective work or replacing defective materials
• Punch-list items or minor touch-up work that is not part of the core contractual performance
• Routine warranty visits or maintenance calls after project completion
• Delivering tools or equipment to retrieve them from the site (with no actual work performed)

How Does the Lien Process Work?

Filing a mechanics lien is not as simple as filling out a form. It is a multi-step legal process with specific content, delivery, and recording requirements. Here is a general overview for a subcontractor — typically the more complex scenario:

Step 1: Document Your Work and Nonpayment

Gather your contracts, invoices, delivery receipts, correspondence, and records showing the last date you performed lienable work. The clock starts from that date. Document any approved extras or change orders separately, as these require clear and convincing evidence to include in your lien.

Step 2: Serve the Notice of Intent to Lien (Subcontractors)

Within 90 days of your last lienable work, serve written notice on the owner of record and, if known, the lending agency. As of January 1, 2025 (Public Act 103-0827), approved delivery methods include FedEx, UPS, DHL with tracking, USPS certified mail (any authorized recipient), or personal delivery. Notice is deemed served on the day it is placed with the carrier — not the day it arrives.

Step 3: Prepare and Record the Claim for Lien

A formal lien document must be drafted and recorded with the County Recorder of Deeds in the county where the property is located. For contractors, this must happen within four months of the last lienable work to preserve priority against third parties.

Step 4: Identify and Join All Necessary Parties

Under 770 ILCS 60/11, necessary parties include all persons with a valid claim to any part of the premises — including mortgage lenders. In CB Construction & Design, LLC v. Atlas Brookview, LLC (2021), the Illinois Appellate Court held that failure to join a known lender within the 30-day Section 34 window resulted in absolute forfeiture of the lien. Identifying all necessary parties before filing suit is not optional.

Step 5: File Suit to Enforce If Necessary

Recording a lien is not the end — it is the beginning. If you are not paid, you must file a foreclosure lawsuit within two years of the last lienable work (or within 30 days if the owner sends a valid Section 34 demand). The lien does not enforce itself.

2025 Law Update: New Notice Delivery Rules for Subcontractors

Illinois significantly modernized its mechanics lien notice rules effective January 1, 2025, through Public Act 103-0827 (HB 4660). Before this change, subcontractors were required to use certified mail with "delivery limited to addressee only" — meaning if an owner was traveling, refused delivery, or ignored the mailbox, a valid lien claim could slip away through no fault of the subcontractor.

• Nationally recognized carriers now accepted: FedEx, UPS, and DHL with tracking are valid service methods. No specific individual's signature is required — digital tracking confirmation is sufficient proof.
• "Limited to addressee only" requirement eliminated: USPS certified mail still works, but any authorized person at the address may now accept the notice.
• Mailbox rule codified: Notice is legally served on the day it is placed in the mail or dropped off with a carrier — not the day it arrives. A notice mailed on day 89 is timely even if it arrives on day 93.

These changes apply to notices under Sections 24 and 25 of the Act.

Statutory Interest and Extras: What Can You Claim?

The amount recoverable in a mechanics lien is not limited to the base contract price. Under 770 ILCS 60/1(a), lien claimants are entitled to interest at the rate of 10% per annum from the date the amount became due. This interest is treated as part of the principal of the lien and is recoverable in a foreclosure sale alongside the base debt.

Change Orders and Extras

To include extras or change orders in a lien claim, a contractor must demonstrate by clear and convincing evidence that: (1) the items were outside the scope of the original contract; and (2) the owner specifically ordered the extras and agreed to pay for them. Verbal approvals, ambiguous email exchanges, and unsigned change orders are common sources of dispute. Contractors should document all change order authorizations in writing, signed by the owner, before performing additional work.

Fraudulent Overcharge

While an honest error or overcharge does not automatically defeat a lien, a contractor who grossly overstates the lien amount to exert leverage can face a charge of constructive fraud, which may result in the court invalidating the entire lien — not just the excess portion. Accuracy in lien amounts is both a legal and a strategic imperative.

What Property Owners Need to Know

If a mechanics lien has been filed against your property, or if you have received a Notice of Intent to Lien, your first instinct may be alarm. That is understandable. A recorded lien is a cloud on your title that can block a sale or refinance until it is resolved. But not every lien is a valid lien, and you have rights.

The "Double Payment" Risk and the Sworn Statement

One of the most important — and most overlooked — protections in the Act applies specifically to homeowners. Under 770 ILCS 60/5, it is both the contractor's duty to provide and the owner's duty to require a sworn statement before any payment is made. This statement lists every subcontractor and supplier on the project and the amounts owed to each.

If an owner pays a contractor without requiring this sworn statement, that payment is considered "wrongful" and does not protect the owner against a subcontractor's lien for the same work. The owner may then be legally required to pay the subcontractor even though they already paid the contractor — in other words, double payment for the same improvement.

How Can You Fight a Lien?

Property owners have several ways to challenge or resolve a mechanics lien:

• Procedural defects: If the claimant missed a deadline, failed to serve proper notice, or omitted required information, the lien may be void or unenforceable. Illinois courts enforce these requirements strictly and without equitable exceptions.
• The "first to breach" doctrine: In PML Development, LLC v. Village of Hawthorne Woods (2023), the Illinois Supreme Court clarified that if a contractor materially breaches a contract, they may lose their right to payments (and, presumably, the resultant lien) — even if the owner also defaulted — unless the owner continued to accept performance after the breach.
• Lien waivers: If the claimant signed a lien waiver during the course of the project, that waiver may extinguish their rights for the amounts covered. Notably, an unconditional waiver signed before a check clears can still extinguish lien rights even if the check later bounces.
• Fraudulent overcharge: If the amount claimed is grossly inflated or stated with reckless disregard for accuracy, the entire lien may be invalidated on constructive fraud grounds.
• Bonding over the lien: Illinois law allows the lien to be removed from your property and transferred to a surety bond (at 175% of the lien amount), so a sale or refinancing can proceed while the dispute is resolved in court.

The Section 34 Demand: Forcing the Issue

770 ILCS 60/34 gives property owners a powerful "put up or shut up" tool. If a lien has been recorded and the owner wants to force resolution, they can send a written demand to the lien claimant that accelerates the two-year statute of limitations to just 30 days. If the claimant does not file suit within that 30-day window, the lien is permanently forfeited — regardless of how much time remained on the normal two-year period.

To be valid under the statute, the demand must contain the following language in at least 10-point boldface type:

A Section 34 demand that omits this language, or does not present it in boldface type, may be invalid and may not accelerate the deadline. Once a valid demand is issued, the claimant must also join all known necessary parties (including lenders) within that same 30-day window — failure to do so can result in complete forfeiture of the lien, as illustrated by CB Construction v. Atlas Brookview (2021).

Lien Waivers: What Contractors and Owners Both Need to Know

Lien waivers are among the most powerful — and most misunderstood — documents in the construction payment process. Illinois law draws an important line between conditional and unconditional waivers:

• Unconditional waivers extinguish lien rights immediately upon signing, regardless of whether payment is actually received. An unconditional waiver signed before a check clears eliminates lien rights even if the check later bounces. Contractors should exercise extreme caution before signing unconditional waivers on any amount not yet confirmed received.
• Conditional waivers only become effective upon confirmed receipt of payment. These are the safer option for contractors receiving partial payments on large projects.
• Prospective waivers (blanket agreements to waive future lien rights before work begins) were largely prohibited by 2014 amendments to the Act. However, a contractor may still agree to subordinate their lien to a mortgage if more than 50% of the loan has already been disbursed for improvements.

For lenders and property owners, obtaining properly executed lien waivers at each draw or payment milestone is the primary defense against mechanics lien exposure throughout a project.

Bonding Over a Lien: Removing a Cloud From Your Title

When a property is under contract for sale — or when a developer needs to refinance — a recorded mechanics lien can throw everything into chaos. Illinois provides a solution under 770 ILCS 60/38.1: bonding over the lien.

Any interested party may petition the circuit court to substitute a surety bond for the real estate as security for the lien claim. The bond must equal 175% of the lien claim amount and must be issued by a surety rated A or better. Once the court approves the substitution, the lien is removed from the property records and attaches to the bond instead, allowing a sale or refinancing to close while the underlying claim is litigated.

Liens on Public Construction Projects

If you performed work on a public building, road, or government-owned facility, you cannot place a lien on the property itself — public property cannot be sold to satisfy a private debt. Illinois law provides a separate remedy: a lien against public funds under 770 ILCS 60/23.

A Section 23 claim attaches to the money, bonds, or warrants due or about to become due from the public body to the general contractor. Upon receiving a valid Section 23 notice, the public body has a mandatory duty to withhold funds sufficient to cover the claim. The procedural timelines are strict and compressed:

• Service of notice: Must be served on the relevant public official by hand delivery or certified mail.
• Filing suit: The claimant must file a lawsuit within 90 days of serving the Section 23 notice.
• Notification of suit: Within 10 days of filing, the claimant must deliver a file-stamped copy of the complaint to the public official. Missing this step can be fatal to the claim.

Liens on Condominium Properties: Apportionment and Risk

Filing a mechanics lien against a condominium property requires careful attention to apportionment rules governed by Section 9.1 of the Illinois Condominium Property Act (765 ILCS 605/9.1) in conjunction with Section 7 of the Mechanics Lien Act.

If a contractor performs work on the common elements (lobby, parking garage, roof), they must allocate the total lien amount among individual units based on each unit's percentage of ownership interest in the common elements. Work performed on an individual unit is simpler: the lien attaches only to that specific unit and no allocation is required.

Key Illinois Case Law on Mechanics Liens

Illinois courts have produced a body of mechanics lien decisions that practitioners and parties must understand. Below are three cases that continue to shape how the Act is applied:

CB Construction & Design, LLC v. Atlas Brookview, LLC (2021)

The landmark necessary-parties case. The Illinois Appellate Court held that a lender who was a "known" necessary party at the time of a Section 34 demand must be joined in the foreclosure lawsuit within the 30-day window. Failure to join a known necessary party within that compressed timeframe resulted in the absolute forfeiture of the entire lien — even though the underlying payment claim was otherwise valid. This case is now the authoritative statement on what it means to have "known" necessary parties in Illinois mechanics lien litigation.

PML Development, LLC v. Village of Hawthorne Woods (2023)

The Illinois Supreme Court's clarification of the "first to breach" doctrine. The Court held that if a contractor materially breaches a contract, they may lose their right to payment — even if the property owner also defaulted — unless the owner continued to accept the contractor's performance after the breach.

AUI Construction Group, LLC v. Vaessen

The leading Illinois decision on the trade fixture doctrine. The court emphasized that the intent of the parties is the pre-eminent factor in determining whether an item is a permanent improvement (lienable) or a removable trade fixture (non-lienable). The case held that even a massive 500-foot-tall wind energy system could be deemed a trade fixture — and therefore non-lienable — if the contract indicated an intent for the item to remain personal property and it was capable of removal without permanent structural damage to the realty.

Frequently Asked Questions: Illinois Mechanics Lien Law

Does a lien mean the contractor can take my house?

Not immediately. A recorded lien gives the claimant the right to eventually foreclose on the property if the debt is not paid and a lawsuit is filed — similar to how a mortgage works. Foreclosure is a lengthy court process, and there are many opportunities to resolve or challenge the lien before it reaches that point. A properly served Section 34 demand can also force the claimant to litigate within 30 days or permanently lose the lien.

What if the contractor did bad work — can they still file a lien?

Potentially, but it depends on the severity of the deficiency. A contractor who substantially performed their obligations can claim a lien even if there are quality disputes. However, a contractor who materially breached the contract — especially if the owner did not continue to accept performance — may lose their right to payment under the doctrine clarified in PML Development (2023). Defective work can also be raised as a counterclaim to reduce the amount recoverable.

I just received a Notice of Intent to Lien. What do I do?

Do not ignore it. A notice is not yet a recorded lien, but it is a legally significant warning that one may be coming. Review your payment records, gather your contracts and sworn statements, and consult an attorney promptly. Depending on the facts, you may be able to resolve the underlying dispute quickly — or take steps to challenge the claim before a lien is ever recorded.

Can a lien be filed on a rental property or investment property?

Yes. The Mechanics Lien Act applies to all real property in Illinois, not just owner-occupied homes. However, some additional homeowner protections — such as the 60-day early warning notice requirement for residential subcontractors — apply specifically to owner-occupied single-family residences. The rules that govern rental and investment properties more closely resemble the commercial lien framework.

How is a mechanics lien different from a judgment lien?

A mechanics lien arises from unpaid construction work and attaches to a specific property where the work was performed. It must be perfected through the Act's notice and recording procedures. A judgment lien, by contrast, arises when a court enters a money judgment and the winning party records it in the county where the debtor owns real estate — it can attach to any real property the debtor owns in that county. Mechanics liens generally have stronger priority positions because they can relate back to the date of the original contract.

What is the statutory interest rate on an Illinois mechanics lien?

Under 770 ILCS 60/1(a), lien claimants are entitled to interest at the rate of 10% per annum from the date the amount became due. This interest is treated as part of the principal of the lien and is recoverable in a foreclosure proceeding alongside the base unpaid balance.

This guide is provided for general informational purposes only and does not constitute legal advice. Every situation is different. Please consult a licensed Illinois attorney before taking action regarding any legal matter.
CTM Legal Group | Illinois Advocates, LLC d/b/a CTM Legal Group | Chicago, Illinois | Serving Cook, DuPage, Kane, Will, Lake, McHenry, and Kankakee Counties