Tri State Stone & Building Supply Inc. will remain open during normal business hours to provide essential supplies for building and landscape maintenance.  Any updates to hours of operation will be posted here. Please see the following link for specific information on safety protocols and limitations: 

COVID-19 Update

Tri-State Stone and Building Supply has been supplying stone and building materials to the greater Washington DC Metropolitan area for over 90 years.  Family owned and operated since its inception in 1926.  We carry an extensive inventory of hand selected stone and building materials including flagstone, wallstone, decorative landscape stone, building stone, and veneers.

We are the exclusive quarriers of Carderock® Stone.   This beautiful building stone is a mica-schist quartzite, with horizontal and vertical cleavage making it easy to work into numerous installation styles. The vibrant blues, browns, grays and greens create an aesthetically pleasing palette of colors for most any stone project. The unique colors, durability and ease of use have made Carderock® Stone a favorite of architects, designers, stone masons and homeowners for generations.