770 ILCS 60/0.01 et seq.Intent to Lien Notice

Illinois Mechanics Lien Law

Did work on a construction project in Illinois and didn't get paid? A mechanics lien is your strongest legal tool to collect. This guide covers everything — who can file, what notices you need to send, and when your deadlines are — in plain English, not lawyer-speak.

Preliminary Notice

Not required

Notice of Claim required

Lien Filing Deadline

4 months

From completion of work

Enforcement Period

2 years

To file foreclosure suit

Project Types

All Projects

Understanding Illinois Mechanics Lien Law

If you've done construction work in Illinois and haven't been paid, you have the legal right to file a mechanics lien under 770 ILCS 60/0.01 et seq.. A mechanics lien is a claim against the property you improved — it prevents the owner from selling or refinancing until your payment is resolved.

Illinois uses an intent-to-lien system. You don't need to send a notice at the beginning of a project. Instead, when you haven't been paid and are considering filing a lien, you first send a “Notice of Claim” — a final demand that gives the property owner one last chance to pay before you take legal action.

Who Can File a Mechanics Lien in Illinois?

Nearly anyone who contributes to a construction project can file a lien if they're not paid. This includes general contractors, subcontractors (electricians, plumbers, roofers, etc.), material suppliers (lumber, concrete, fixtures), equipment rental companies, laborers, architects and engineers, and surveyors. You don't need a direct contract with the property owner — even if you're several layers down the payment chain, Illinois law likely protects your right to get paid. The specific rules (like notice deadlines) vary by your role, so check the details below.

How a Mechanics Lien Protects You

A mechanics lien is one of the most powerful payment tools in construction — it puts a legal claim on the property itself. That means the owner can't easily sell, refinance, or get a clear title until your payment is resolved. In many cases, filing a lien typically motivates payment without going to court. To protect your lien rights, file on time and follow Illinois's notice requirements. That's what this guide covers.

Illinois Preliminary Notice Requirements

Required: Notice of Claim

You must send this notice within 90 days of first furnishing labor or materials. Sending it on time keeps your lien rights active and all your options open.

Who Must Receive the Notice?

Make sure every required party receives notice — this keeps your filing valid and your rights protected. Here's who needs to receive the Notice of Claim in Illinois, based on your role:

Your RoleMust Notify
General ContractorNo preliminary notice required
SubcontractorProperty Owner, lending agency
Material SupplierProperty Owner, lending agency
LaborerProperty Owner, lending agency
Equipment Rental CompanyProperty Owner, lending agency
Architect / Engineer / SurveyorProperty Owner, lending agency

Accepted Delivery Methods in Illinois

Use an approved method to make sure your notice holds up. Illinois accepts these methods:

Certified Mail — Sent via USPS with a signed receipt proving delivery. This is the most commonly used method because it provides clear proof.

Registered Mail — The most secure USPS option, with a chain of custody tracking at every step.

Personal Delivery — Hand-delivered directly to the recipient. Get a signed acknowledgment.

Illinois Lien Filing & Enforcement Deadlines

Lien Filing Deadline

4 months

Measured from: completion of work. If you miss this deadline, you lose the right to file a lien on the project.

Enforcement Deadline

2 years

After filing your lien, you have this long to file a lawsuit (foreclosure action) to enforce it. If you don't, the lien expires.

Key Rules for Illinois

Prime contractors do not need preliminary notice

Subcontractors must serve notice within 90 days after completion

Single family residence work requires notice within 60 days of first furnishing

As of January 2025, notice may be served via nationally recognized carrier

Official Illinois Resources

These are official state government websites where you can look up statutes, verify contractor licenses, and search business registrations.

State Legislature

Look up Illinois lien statutes and laws

Illinois General Assembly

Contractor Licensing

Verify licenses and check requirements

Illinois Department of Financial and Professional Regulation

Secretary of State

Business entity search and registration

Illinois Secretary of State

Find Illinois Lien Law by County

Select your county to see how Illinois's mechanics lien requirements apply to projects in your area.

102 counties found

AdamsAlexanderBondBooneBrownBureauCalhounCarrollCassChampaignChristianClarkClayClintonColesCookCrawfordCumberlandDe WittDeKalbDouglasDuPageEdgarEdwardsEffinghamFayetteFordFranklinFultonGallatinGreeneGrundyHamiltonHancockHardinHendersonHenryIroquoisJacksonJasperJeffersonJerseyJo DaviessJohnsonKaneKankakeeKendallKnoxLakeLaSalleLawrenceLeeLivingstonLoganMaconMacoupinMadisonMarionMarshallMasonMassacMcDonoughMcHenryMcLeanMenardMercerMonroeMontgomeryMorganMoultrieOglePeoriaPerryPiattPikePopePulaskiPutnamRandolphRichlandRock IslandSalineSangamonSchuylerScottShelbySt. ClairStarkStephensonTazewellUnionVermilionWabashWarrenWashingtonWayneWhiteWhitesideWillWilliamsonWinnebagoWoodford

Illinois Mechanics Lien FAQ

Common questions about mechanics liens in Illinois, answered in plain English.

In plain English: a mechanics lien is your legal right to get paid for construction work. If you did work on a building or property in Illinois and the person who owes you money won't pay, you can place a lien — essentially a legal "hold" — on that property. This means the property owner can't easily sell or refinance until your bill is settled. If they still refuse to pay, you can go to court to force the sale of the property to collect what you're owed. In Illinois, this protection comes from 770 ILCS 60/0.01 et seq.. It exists because construction is unique — you can't exactly repossess the plumbing you installed or the foundation you poured. Nearly anyone who works on a project (contractors, subs, suppliers, laborers, architects, engineers) can use this protection.
Yes. Illinois requires you to send a document called a "Notice of Claim" to protect your right to file a lien later. This is an "intent to lien" notice — meaning you send it when you haven't been paid and are planning to file a lien. It serves as a final warning to the property owner that you intend to place a lien on their property if payment isn't made.
You have 4 months from completion of work to file your mechanics lien with the county recorder's office. This is a hard deadline — if you miss it, you lose your right to file a lien on that project entirely. For example, if you finish work on a project in March and the deadline is 4 months, start counting from your last day of work (or last material delivery) and make sure your lien is filed and recorded before that window closes. Pro tip: mark this date on your calendar the day you start a project and set reminders well in advance.
Under 770 ILCS 60/0.01 et seq., the following people and companies can file a mechanics lien in Illinois if they're not paid for work on a construction project: general contractors (the main company hired by the property owner), subcontractors (plumbers, electricians, roofers, HVAC techs, etc. hired by the GC), sub-subcontractors (companies hired by subs), material suppliers (lumber yards, concrete companies, fixture suppliers), equipment rental companies (cranes, excavators, scaffolding), laborers and workers, architects and engineers who design the project, and surveyors. The key thing to understand: you don't need a direct contract with the property owner to file a lien. Even if you're three layers down the payment chain (the owner hired a GC, who hired a sub, who hired you), you likely still have lien rights in Illinois. However, the specific notice requirements and deadlines vary depending on your role — subcontractors and suppliers typically have extra steps that general contractors don't.
Illinois requires you to use one of these approved delivery methods: Certified Mail, Registered Mail, Personal Delivery. Certified mail is the most commonly used method because it provides a receipt proving the notice was sent and delivered — this proof is important if there's ever a dispute. Using the wrong delivery method can make your notice legally invalid, so always stick to the approved methods. Keep copies of all delivery receipts and tracking information.
Who you need to notify depends on your role on the project. If you're the general contractor, you typically don't need to send a preliminary notice. If you're a subcontractor (hired by the GC or another sub), you need to notify: the property owner, lending agency. Material suppliers must notify: the property owner, lending agency. Laborers typically follow the same rules as subcontractors and must notify: the property owner, lending agency. Equipment rental companies follow material supplier rules and must notify: the property owner, lending agency. Design professionals (architects, engineers, surveyors) must notify: the property owner, lending agency. Missing even one required recipient can weaken or invalidate your lien rights.
After you file a mechanics lien, it doesn't automatically get you paid — it's just a legal claim against the property. To actually collect, you need to "enforce" the lien by filing a lawsuit (called a foreclosure action) in court. In Illinois, you must file this lawsuit within 2 years after recording the lien. If you don't file suit in time, the lien expires and you lose that leverage. The good news is that most liens get resolved through payment or negotiation before going to court — the lien itself is often enough motivation for the property owner to pay.
Yes, Illinois mechanics lien laws cover both residential projects (homes, apartments, condos) and commercial projects (offices, retail spaces, warehouses). However, the rules can differ between the two. Residential projects often have extra protections for homeowners, while commercial projects may have different deadlines or notice requirements. Always check whether your specific project has any special rules under 770 ILCS 60/0.01 et seq..

Here's the process step by step, with why each step matters:

Step 1 — Send the required "Notice of Claim" to all required parties. WHY: This preserves your legal right to file a lien later. Skip it and you could lose everything.

Step 2 — Document everything: keep records of your contract, invoices, delivery tickets, and communications about nonpayment. WHY: If this goes to court, your records are your evidence.

Step 3 — Prepare your lien claim with your name, the property address, description of work performed, dates of first and last work, and the exact amount owed. WHY: Errors in the lien document can get the whole thing thrown out.

Step 4 — File the lien claim at the county recorder's office (small recording fee, usually $10-$75) within the 4 months deadline. WHY: This is the legal moment your claim attaches to the property — miss the deadline and you lose the right entirely.

Step 5 — Send a copy of the filed lien to the property owner. WHY: Many disputes resolve right here — owners take liens very seriously because they cloud the property title and block sales and refinancing.

Step 6 — If still not paid, file a lawsuit (foreclosure action) within 2 years. WHY: The lien expires if you don't enforce it. But most cases settle before this stage.

Illinois uses an "intent to lien" system. This is simpler than some states — you don't need to send anything at the start of the project. Instead, if you're not getting paid, you send a "Notice of Claim" before filing the actual lien. Think of it as a formal demand letter that says "pay me or I'm filing a lien on this property." This gives the property owner one last chance to pay before you take legal action.
Illinois has some important rules that can trip people up: (1) Prime contractors do not need preliminary notice. (2) Subcontractors must serve notice within 90 days after completion. (3) Single family residence work requires notice within 60 days of first furnishing. (4) As of January 2025, notice may be served via nationally recognized carrier. These details matter — overlooking any of them could affect your ability to get paid. When in doubt, consult 770 ILCS 60/0.01 et seq. or speak with a construction attorney in Illinois.
The full text of Illinois's mechanics lien law is found in 770 ILCS 60/0.01 et seq.. You can read it for free on the Illinois General Assembly website. While the legal language can be dense, it's the definitive source for all requirements. For licensing questions, contact the Illinois Department of Financial and Professional Regulation. For business registration, check the Illinois Secretary of State.
LienGrid takes the complexity out of Illinois mechanics lien compliance. Instead of tracking deadlines manually, figuring out who needs to receive notices, and worrying about using the right legal language, LienGrid handles it all automatically. The platform generates your Notice of Claim with the correct statutory language, tracks all your deadlines, identifies every required recipient, sends notices via approved delivery methods, and alerts you before any deadline expires. It's like having a lien compliance expert on your team for every project. Start a free trial to see how it works.

Lien Laws in Neighboring States

Iowa →Indiana →Kentucky →Missouri →Wisconsin →
View Illinois Preliminary Notice Requirements
Content reviewed by LienGrid's compliance team|Last reviewed: March 2026

This information is for general guidance only and does not constitute legal advice. Illinois laws change frequently — always verify current requirements and consult a licensed attorney in the relevant jurisdiction before taking legal action. LienGrid makes every effort to keep this information accurate, but we cannot guarantee completeness or currency.

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