Quiddity
Civil EngineeringTexas, United States501-1000 Employees
Quiddity is a full-service civil engineering firm that also offers planning, surveying, and consulting services for both public infrastructure and private development projects. Headquartered in Bellaire, Texas, the company operates across offices in Texas and Florida to serve a diverse set of markets. The firm serves nearly 20 public and private markets, handling projects ranging from wastewater treatment facilities and highway design to multi-family housing and master-planned communities. It has grown to more than 700 employees across ten Texas offices and two Florida offices. The company has earned recognition from Engineering News-Record as a Top 500 design firm and has been consistently named a Best Place to Work by regional publications. In 2026, Quiddity expanded its footprint with a new office in Waco, Texas.