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About Capitol Building Supply

Quality. Service. Reliability.

Welcome to Capitol Building Supply (CBSI) – home to the largest selection of quality construction materials and building supplies across the Mid-Atlantic region. Choose a topic below to learn more about:

Our Company – Our parent company GMS, careers with CBSI, credit application and other valuable customer resources

Articles – product releases and other updates

Our Services – delivery, pick-ups, specialty orders, showrooms and more

Our Products – drywall, steel, acoustical tiles, insulation, tools, lumber, etc.

Our Yards – locations in Maryland, Delaware, Virginia, and the D.C. metro area

Need to talk to an expert to help with your next project?

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