770 ILCS 45/1
Every person, firm or corporation who has expended labor, skill or materials upon any chattel, or has furnished storage for said chattel, at the request of its owner, reputed owner, or authorized agent of the owner, or lawful possessor thereof, shall have a lien upon such chattel beginning on the date of the commencement of such expenditure of labor, skill and materials or of such storage for the contract price for all such expenditure of labor, skill or materials, or for all such storage, or in the absence of such contract price, for the reasonable worth of such expenditure of labor, skill and materials, or of such storage, for a period of one year from and after the completion of such expenditure of labor, skill or materials, or of such storage, notwithstanding the fact that the possession of such chattel has been surrendered to the owner, or lawful possessor thereof.
770 ILCS 45/1