There is a 60-day pre-lien notice for residential projects; 90 days notice for commercial projects. Any person (including a professional engineer) has a lien on any improved property as of the date of the contract. There are different filing dates on whether you are a contractor (contract directly with the owner) or a subcontractor. Four months from the last substantial work for a contractor, 90 days for a subcontractor. To enforce a lien a claimant must file suit within two years after the last date of work. No liens are allowed on public projects. 770 Illinois Compiled Statutes 60

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