person Your Account Find a Yard Resources Now Hiring! All arrow_drop_down search PRODUCTS keyboard_arrow_down Home Page About Us About Us Our Company Articles Services Products & Brands Project Gallery Yards 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 20 locations including three yards in Delaware (Dover, New Castle, Selbyville), seven yards in Maryland (Baltimore, Beltsville, Bladensburg, Frederick, Gaithersburg, Hagerstown, Upper Marlboro), two yards in New Jersey (Atlantic City, 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. Copyright © 2021 Capitol Building Supply, Inc. - All Rights Reserved | Terms of Use | Privacy Policy | California's Proposition 65 | Accessibility Statement Capitol Building Supply, Inc. Department # 34792, Alexandria VA, 22334-0792 US