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Our Company Resources GMS / Parent Company Careers Credit Application Sto® FallTech Safety DeWalt 20V Max tools ClarkDietrich BlazeFrame USG UltraLight Drywall Dow Thermax Sheathing Makita 18V Power Tools Armstrong Drywall Grid Systems National Gypsum eXP Wallboard Dow Thermax Exterior Insulation USG Sheetrock Joint Compounds DeWalt 60V Max tools Hyde Hand Tools Marshalltown Tools USG Sheetrock® Tools Armstrong WoodWorks® Louisville Ladders Super Stud Steel G-P Dens Drywall Products Cendrex Access Doors Ramset Fasteners Armstrong SoundScapes RedHeader PRO system Commercial Delivery Residential Delivery Fleet Capabilities Knowledgeable Professionals Ordering Specialty Products Safety / Site Reviews Showrooms & Customer Pick-ups Drywall Steel Studs & Tracks Acoustical Ceilings Hand & Power Tools Joint Treatment & Finishes Insulation EIFS & Exterior Finishes Safety Surface Protection Accessories Flooring Lumber Access Doors Firestops FRP Panels Fasteners Fry Reglet 7770 Norfolk Condominiums Delmarva Health and Medical Pavilion Doylestown Assisted Living Light House Christian Church Oxford Square Plantation Lakes by Lennar Homes Ryan Homes Schuyler Crossing Theodore Roosevelt Senior High School Trump International Hotel Wegmans Grocery Store Dover, DE Selbyville, DE Baltimore, MD (Quad Ave) Baltimore, MD (Hamburg St) Beltsville, MD Bladensburg, MD Frederick, MD Gaithersburg, MD Hagerstown, MD Upper Marlboro, MD Camden, NJ Fredericksburg, VA Manassas Park, VA Marshall, VA Springfield, VA Vienna, VA Winchester, VA Washington, DC

Knowledgeable Professionals

We’ve spent decades in the business.

Our professionals have an average tenure of a decade.

Most of our employees have been proudly serving our commercial, residential and general contractors for 10 years or more. Our teams are trained to provide excellent customer service and to help you order the right products for your particular application. We take pride in our commitment to staying current on industry trends, new product offerings, and labor saving ideas, and we don’t believe in stupid questions. If we don’t know the answer, we’ll work with our manufacturers to get it for you.

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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.