Md. Code, Business Occupations and Professions § 4–508

(a) Except as otherwise provided in this subtitle, a barbershop may not be integrated with any other business.

(b) A person may conduct another business on the premises of a barbershop only if the business and barbershop are separated by a permanent wall or partition.

(c) An individual licensed to practice cosmetology may practice cosmetology in a barbershop.