Md. Code, Business Regulation § 8–601

(a) Except as otherwise provided in this title, a person may not act or offer to act as a contractor in the State unless the person has a contractor license.

(b) Except as otherwise provided in this title, a person may not sell or offer to sell a home improvement in the State unless the person has a contractor license or salesperson license.

(c) A person who violates this section is guilty of a misdemeanor and, on first conviction, is subject to a fine not exceeding $1,000 or imprisonment not exceeding 6 months or both and, on a second or subsequent conviction, is subject to a fine not exceeding $5,000 or imprisonment not exceeding 2 years or both.