Now a part of the Dillon Consulting Limited team


As of March 1, 2020, we are pleased to announce we have merged with Dillon Consulting Limited. This is a strategic marriage of two very well known, reputable and respected consulting engineering firms - dating back to 1946 (Dillon) and 1954 (ONSA).

About ONSA

F.C. O'Neill, Scriven and Assoc's Limited (ONSA) is a consulting engineering and design firm which specializes in the Electrical & Mechanical Building Sciences and Fire Protection Engineering. More »


Our Work

The engineering requirements for commercial and industrial development in Atlantic Canada vary widely. Indicative of the Company's ability to meet... More »



ONSA designs mechanical and electrical infrastructure for a wide variety of building types and clients utilizing a wide range of project delivery methods. More »