O’Donnell & Naccarato is a creative consulting structural engineering firm operating nationally to support the entire building lifecycle. O&N leverages 38 years of experience in the design of new buildings, renovations, retrofits, expansions, and restorations of all types and levels of complexity.
O&N has over 50 Engineers registered across 49 states plus the District of Columbia. Annually, the firm is responsible for the design of 850 projects on average with construction values in excess of $2 billion. O’Donnell & Naccarato’s core Structural Engineering services are complemented by an in-house facade and garage restoration division staffed with SPRAT-certified personnel equipped to provide high-elevation rope access investigation of hi-rise structures.
As a partner to design professionals and building owners alike, our objective is to enhance each facility’s value and extend its useful life. O&N’s Philadelphia headquarters is supported by two Mid-Atlantic branch offices, a Mid-West branch office, and O’Donnell & Naccarato Structural Engineers, a Manhattan-based corporate affiliate founded by O&N Principals to serve projects in New York State.