(a) This title does not apply to a transaction of: (1) the United States or an instrumentality of the United States; or (2) a state or an instrumentality or political subdivision of a state. (b) A county or municipal corporation of the State may not: (1) require a person to get authorization to do business performing or selling a home improvement; or (2) regulate the qualifications necessary to do that business. (c) This title does not limit the power of a county or municipal corporation: (1) to regulate the character, performance, or quality of a home improvement by having a system of inspections and permits designed to: (i) ensure compliance with and help to enforce applicable State and local building laws; or (ii) enforce other laws necessary to protect the public health and safety; or (2) to adopt a system of inspections and permits that requires: (i) submission to and approval by the county or municipal corporation of plans and specifications for an installation, before construction of the installation begins; and (ii) inspection of work done.
Maryland Legal Code