McComas / O'Donnell & Naccarato (formerly McComas Engineering) is a creative structural engineering firm operating nationally to support the entire building life cycle. We design new buildings, renovations, retrofits, expansions, and restorations of all types and levels of complexity.


Founded in 1991 by Rod McComas, PE, SE, McComas Engineering experienced tremendous growth with the completion of many building projects throughout the United States. In 2019, the entire McComas staff combined forces with O'Donnell & Naccarato, a Philadelphia-headquartered structural engineering firm founded in 1981. The merger resulted in a firm with 5 regional offices and a staff of over 100, including Professional Engineers registered in 49 states and Washington D.C. As a partner to design professionals, owners, and institutions, our objective is to incorporate each stakeholder's demands of form, function, schedule, and budget into each engagement.


Economical price, shortest schedule, best technology, greatest flexibility: no matter how our clients define value, McComas Engineering has the talent, experience and creativity to exceed their expectations and deliver superior financial returns on their investment.

Text Box: McComas was an early-adopter of Building Information Modeling using Revit Structure.
McComas Engineering Project Display