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.

Ringsend WWTP Capacity Upgrade



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.

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.