All of the following are exempt from licensing under the Home Improvement Law EXCEPT a:

In the context of the Maryland Home Improvement Law, licensing exemptions are provided to certain professionals whose work is regulated by specific licensing boards. Plumbers, electricians, and architects typically hold separate licenses that are required by the state in order to practice their trades, thus they are exempt from needing a special home improvement salesperson license when they are performing work related to their licensed trade.

On the other hand, a fence contractor does not fall under the same regulatory framework that grants licensing exemptions. Since the work of a fence contractor is considered part of home improvement and does not have a distinct licensing board overseeing it, they must be licensed under the Maryland Home Improvement Law. This is why fence contractors are not exempt from licensing and would require a home improvement salesperson license in order to legally operate in this capacity.