Your license class can be changed at any time during the duration of an active license or at the time of renewal. In order to change your license class you must submit a letter in writing requesting the change, along with proof of insurance the appropriate license fee. Funds are not transferrable from previous licenses held, so the entire fee must be submitted, not the difference. The insurance certificate must meet the City of Chicago insurance requirements according to the license class. The letter must be on company letterhead, it must include the license number along with what class the change is going to be and it must be signed by an authorized officer or member of the company. If you are changing the class at the time of renewal, include the letter along with the renewal packet.