Who We Are

T. J. O’Connor & Associates
Civil & Structural Consulting Engineers

Since 1937 T. J. O’Connor & Associates has provided engineering design services for major national infrastructural projects and major iconic developments.

Read about T. J. O’Connor & Associates and Building Information Modelling (BIM), including becoming the first firm certified to international BIM standard I.S. EN ISO19650.

Read about T.J.O’Connor & Associates Pledge to Net Zero

ACEI ENGINEERING EXCELLENCE AWARDS: CIVIL 2022



Civil and Structural Engineers for the original upgrade contract to Ringsend WWTP catering for 1.64 million P.E. (40% of the country’s population) and the current contract increasing the capacity to 2.4 million P.E., equating to effluent treatment for 60% of the country’s population.
Read more about the ACEI Engineering Excellence Award.

Find out about our Civil Engineering services.

Worlds First Bi-Steel Core



Structural Engineers for the design of the worlds first bi-steel core, part of  the 3 million sq. ft. Dundrum Town Centre development.

Find out about our Structural Engineering services.

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