Md. Code, Business Regulation § 8–307

(a) A contractor license authorizes the licensee to act as a contractor or subcontractor and to sell a home improvement.

(b) A salesperson license authorizes the licensee to sell a home improvement.

(c) A license issued under this subtitle does not authorize the licensee to engage in a business or provide a service that may be engaged in or provided only by a person licensed under other State or local law.