Builder Mart is the largest, one-day building industry trade show and entering its 49th year as the premier home builder, developer and remodeler industry event. Visit national, regional and local vendors and network with over 3,000 other building industry professionals all under one roof at the Maryland State Fairgrounds. This fully catered event includes an all-you-can-eat bull & oyster roast and a can't-miss after party from 6:00-8:00.