What is the deadline to file a mechanics lien in Illinois?
Last reviewed July 5, 2026
In Illinois, you have 4 months from the last day of work or delivery of materials to file a mechanics lien. If you are working on a residential project, you must serve a Notice of Intent to Lien at least 10 days before filing.
Key points
- 4-month deadline for filing a lien
- 10-day notice for residential projects
- File in the county where the property is located
- Ensure you follow the correct procedures.
Make sure you keep track of when the last work or materials were delivered to stay within this timeframe. If you're working on a residential project, remember to send your Notice of Intent to Lien before filing the actual lien. Check the Illinois Mechanics Lien Act for specifics.
How Alloovium helps
Alloovium can help track deadlines and ensure compliance with lien filing requirements.
See how it worksRelated questions
- Can a subcontractor file a lien without a written contract in Illinois?
- Do I need to send a preliminary notice before filing a lien in Illinois?
- How long does a mechanics lien last in Illinois?
- How much retainage can be withheld on a construction project in Illinois?
- What are the prompt payment rules for construction in Illinois?
- What is the difference between a conditional and unconditional lien waiver in Illinois?
General information for US construction professionals — not legal advice. Lien deadlines, retainage caps and notice rules vary by state; verify with the state statute or a construction attorney.