Signet Testing Laboratories, Inc.
ConstructionCalifornia, United States11-50 Employees
Signet Testing Laboratories, Inc. (Signet/STL) is a California-based construction-focused materials testing and inspection firm. A Delaware corporation and wholly owned subsidiary of United Engineering Resources, Inc., Signet has operated since 1966, establishing a long-standing presence in the state and building a reputation for professional and quality services. The company serves a broad range of markets, including business parks, commercial and industrial facilities, power and renewable energy projects, water and sewer treatment facilities, educational institutions, roadways and transportation infrastructure, civic centers, and parking structures. Based in Hayward, Signet emphasizes inspection and testing capabilities as a core offering, supporting projects across multiple sectors of the built environment with an emphasis on independent verification and technical reliability.