815 ILCS 513/15
Prior to initiating home repair or remodeling work for over $1,000, a person engaged in the business of home repair or remodeling shall furnish to the customer for signature a written contract or work order that states the total cost, including parts and materials listed with reasonable particularity and any charge for an estimate. In addition, the contract shall state the business name and address of the person engaged in the business of home repair or remodeling. If the person engaged in the business of home repair or remodeling uses a post office box or mail receiving service or agent to receive home repair or remodeling business correspondence, the contract also shall state the residence address of the person engaged in the business of home repair or remodeling.
815 ILCS 513/15