Granite Construction Co

Granite Construction Co builds infrastructure and produces construction materials, operating in the mineral exploration, water infrastructure and transportation markets for private and public clients across the Americas. This listing covers its Santa Maria, California location; the company's website describes Granite's operations as a whole rather than this office specifically.

Granite's construction work spans highways, bridges, earthwork and water projects. Examples on its website include the State Route 20 Omega Curve Realignment, a Caltrans safety project that realigned and widened two accident-prone curves and added drainage and wildlife safety improvements; the American River Bridge in Sacramento; and the Elk Creek Bridge Replacement, finished in December 2025 with a design that removed piers from the creek. Outside California, it has built the Houbolt Road Extension and bridge in Illinois, one of that state's first major design-build jobs; the Eastrail NE 8th Street Crossing in Bellevue, Washington; and the Deer Creek Intake project at a Utah reservoir. Its Granite Industrial group built the McFarland Solar Project serving the Phoenix area.

On the materials side, the company mines aggregates and produces asphalt, using recycled content in its asphalt mixes. Several of its asphalt plants have earned Diamond Achievement Sustainable Commendations, awarded by the National Asphalt Paving Association. Granite also uses delivery methods such as progressive design-build, in which the owner picks a contractor on qualifications and the design and price are worked out together over two phases.

Granite's 2025 Sustainability Report covers safety, community engagement, ethics and energy use, and the company reported its best OSHA recordable incident rate on record. It has also bought Kenny Seng Construction, an infrastructure contractor headquartered in Provo, Utah.