What a mechanics lien is and why contractors file them
A mechanics lien is a legal claim a contractor, subcontractor, or supplier can place on a property when they are not paid for work or materials. In Illinois, filing a lien creates a public record that the property owner owes money for construction work. The lien attaches to the property itself, not just to the owner — which means if the property is sold, the lien travels with it until the debt is settled.
Contractors use liens as leverage to get paid. A property owner cannot sell, refinance, or get a clear title without resolving the lien first. This makes a lien a powerful tool, but it also comes with strict rules about who can file one, when they can file it, and how much time they have.
If you are a property owner, understanding mechanics liens protects you from unexpected claims. If you are a contractor or supplier, understanding the process tells you how to protect your right to payment.
Key Takeaways
- In Illinois, a mechanics lien must be filed within four months of the last date work was performed or materials were delivered to the property.
- Only contractors, subcontractors, laborers, and material suppliers who worked on or supplied the specific property can file a lien — not general creditors.
- The lien is filed with the county recorder in the county where the property is located, and it becomes a public record when ready.
- Property owners can reduce their risk by requiring lien waivers from contractors and subcontractors before making final payment.
- A mechanics lien can be removed only by payment, settlement, or a court order — it does not expire on its own.
The four-month filing important date in Illinois
Illinois law sets a strict important date: a mechanics lien must be filed within four months after the last date work was performed or materials were delivered to the property. This is not four months from when the invoice was sent or when payment was due — it is four months from the actual last day of work or delivery.
If a contractor finishes work on June 15, the lien must be filed by October 15. If materials are delivered on different dates, the clock starts from the final delivery. Missing this important date means losing the right to file a lien entirely, even if the contractor is still owed money. The debt remains, but the lien — the tool that makes the debt enforceable against the property — is gone.
This is why contractors and suppliers track their final work dates carefully. A single day past four months and the filing window closes permanently.
Who can file a mechanics lien in Illinois
Not everyone owed money for construction work can file a lien. Illinois law limits lien rights to people and businesses that directly provided labor, materials, or services to the specific property. This includes:
- General contractors who bid and oversee the project
- Subcontractors hired by the general contractor
- Material suppliers who delivered goods to the site
- Laborers and workers who performed work on the property
- Equipment rental companies that rented machinery for the project
A person or business cannot file a lien straightforward because they are owed money by a contractor. For example, if a subcontractor owes a supplier money, the supplier cannot file a lien on the property — only the subcontractor can, because only the subcontractor worked on the property. The supplier's recourse is against the subcontractor directly, not against the property.
Subcontractors and suppliers who were not paid by the general contractor have an additional option: they can file a notice of non-payment to the property owner, which alerts the owner that someone on the project was not paid. This does not create a lien by itself, but it warns the owner that a lien may be coming.
How to file a mechanics lien in Illinois
A mechanics lien is filed with the county recorder's office in the county where the property is located. The document itself is called a Notice of Lien or Mechanics Lien Claim, and it must include specific information: the property owner's name, a description of the property (usually the street address and legal description), the contractor's name and address, the amount claimed, a description of the work performed or materials supplied, and the dates work began and ended.
The filing fee varies by county but typically ranges from $50 to $150. Once filed, the lien becomes a public record when ready and appears in the county's property records. The property owner and their lender will see it when they run a title search.
Many contractors hire an attorney or a title company to prepare and file the lien to may support it meets all legal requirements. A lien filed incorrectly — with missing information or the wrong legal description — can be challenged and removed by the property owner.
How property owners can protect themselves from liens
The most effective protection is a lien waiver. Before paying a contractor or subcontractor, ask them to sign a lien waiver stating that they have been paid in full and waive their right to file a lien. There are two types: a conditional waiver (the waiver is valid only if the check clears) and an unconditional waiver (the waiver is valid when ready, even if the check bounces).
Property owners should also require contractors to provide proof that all subcontractors and suppliers have been paid before releasing final payment. A contractor can file a lien even if the property owner paid them — if the contractor did not pay their subcontractors, those subcontractors can still file liens on the property.
Another step is to request a Notice of Non-Payment from subcontractors and suppliers. This notice, filed with the county recorder, alerts the property owner that someone on the project claims they were not paid. It does not create a lien, but it gives the owner time to investigate before the four-month window closes.
What happens after a mechanics lien is filed
Once a lien is filed, the property owner has options. They can pay the amount claimed, negotiate a settlement, or dispute the lien in court. If the owner does nothing, the contractor can file a lawsuit to enforce the lien — a process called foreclosure of the lien. This is different from a home foreclosure; it means the court forces the sale of the property to satisfy the debt.
The lien remains on the property until it is paid, settled, or removed by court order. It does not expire after a certain number of years. A property owner trying to sell or refinance will find the lien blocks the transaction until it is resolved.
If a contractor files a lien and the property owner believes it is invalid — for example, the work was never done, or the amount is wrong — the owner can file a Petition to Vacate in court. The burden is on the contractor to prove the lien is valid. If the court agrees the lien is improper, it can be removed.
The difference between a mechanics lien and other construction claims
A mechanics lien is one tool, but contractors and suppliers have other options if they are not paid. A bond claim is a claim against a payment or performance bond posted by the contractor — this is common on public projects. A personal judgment is a court order requiring the property owner to pay, but it does not attach to the property like a lien does.
On public projects (government buildings, roads, schools), the rules are different. Public projects require a prevailing wage and often require contractors to post a bond. Lien rights on public projects are more limited than on private projects, and the filing important date and procedures differ.
If you are involved in a construction dispute, knowing which tool applies to your situation — a lien, a bond claim, or a personal judgment — determines your options and your timeline.
Frequently Asked Questions
Can a contractor file a lien if they were paid in cash but claim the amount was wrong?
No. Once a contractor accepts payment, they have limited grounds to file a lien. If they claim the amount was incorrect, they would need to pursue a separate lawsuit for the difference, not a lien. This is why getting a signed lien waiver from the contractor is important — it confirms they received payment and have no further claim.
What if a subcontractor was not paid but the property owner paid the general contractor?
The subcontractor can still file a lien on the property. The property owner's payment to the general contractor does not protect the property from liens filed by unpaid subcontractors. This is why owners should require proof that all subcontractors and suppliers have been paid before releasing final payment to the general contractor.
How long does a mechanics lien stay on the property?
A mechanics lien remains on the property indefinitely until it is paid, settled, or removed by court order. It does not expire after a set number of years. However, a contractor who files a lien must file a lawsuit to enforce it within a reasonable time, or the lien may become unenforceable through neglect.
Can I remove a mechanics lien by paying the contractor after it is filed?
Yes. Once you pay the amount claimed, the contractor should sign a release or satisfaction of lien, which is then filed with the county recorder to remove the lien from the property record. Get the release in writing before paying, or pay through an attorney's trust account to may support the release is provided.
What should I do if I receive notice that a lien has been filed against my property?
Contact the contractor or their attorney when ready to understand the claim. If you believe the lien is invalid, consult an attorney about filing a Petition to Vacate. Do not ignore it — a lien blocks your ability to sell or refinance, and the contractor can file a lawsuit to enforce it at any time.