United Companies is one of the leading providers of primary construction materials, as well as horizontal construction services in western Colorado. It offers various types of sand, gravel, asphalt and ready-mix concrete materials. The company provides site work, excavation, safety improvement, and utilities and highway construction services through its construction division. It also undertakes rehabilitation projects for a range of existing roadways and bridges. United Companies maintains a construction materials laboratory that is accredited by the American Association of State Highway and Transportation Officials and Cement and Concrete Reference Laboratory. It performs crusher and batch and asphalt plant control testing, as well as has achieved the Diamond Achievement Award by the National Asphalt Pavement Association. United Companies is a subsidiary of Oldcastle Materials, which is one of the leading suppliers of asphalt, ready-mix concrete and aggregates throughout the United States.