Ranked #4 Among the Nation's Top Parking Structure Engineering Firms

O&S Associates, Inc. is honored to announce that we have been ranked #4 in Building Design+Construction's Top 60 Parking Structure Engineering Firms for 2025, as part of the prestigious Giants 400 Report. The annual report recognizes the nation's leading architecture, engineering, and construction (AEC) firms based on their expertise and performance across a wide range of building sectors.

Urban Redevelopment Authority (URA) of Pittsburgh Parking Garage, completed in 2023

This national recognition reflects O&S Associates' longstanding commitment to delivering innovative, cost-effective, and durable parking structure engineering solutions. For 30 years, we have partnered with public agencies, municipalities, developers, institutions, and private owners to design, evaluate, restore, and preserve parking facilities that are safe, resilient, and built to perform.

Having successfully completed more than 2,000 parking structure projects across the United States, O&S Associates has developed a reputation for technical excellence, responsive client service, and practical engineering solutions that maximize the service life of parking facilities.

Thank You to Our Clients and Partners

Being recognized as one of the nation's top parking structure engineering firms would not be possible without the continued trust of our clients, the collaboration of our partners, and the dedication of our exceptional team.

We sincerely thank everyone who has contributed to this achievement. As we continue to grow, O&S Associates remains committed to delivering engineering solutions that enhance safety, improve performance, and provide lasting value for parking structures nationwide.

Learn more about our Parking Structure Engineering Services or contact our team to discuss your next project.