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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?

Experienced and helpful customer service representatives are standing by ready to help.
call CONTACT US
About Us

Teaming up with the top brands in the industry, we have one simple pledge: to get the right products into our customers' hands as quickly and safely as possible.

Our Services

Capitol Building Supply carries a full range of commercial and residential construction supplies, and our crews are fully trained to deliver to all sites.

Our Locations

Our delivery fleet is dispatched from 19 locations including two yards in Delaware (Dover, Selbyville), eight yards in Maryland (Baltimore, Beltsville, Bladensburg, Forestville, Frederick, Gaithersburg, Hagerstown, Upper Marlboro), one yard in New Jersey (Camden), one yard in Pennsylvania (Harrisburg), six yards in Virginia (Manassas, Marshall, Springfield, Stafford, Vienna, Winchester), and one yard in Washington, D.C.

Contact Us

For more information about how to contact us, visit our Find a Yard page. Or, click the Contact Us tab to send us an email.