World class engineering solutions at home


ONSA prides itself on providing world class solutions to every project we take on. We see ourselves as the premiere Mechanical & Electrical design firm in Eastern Canada.

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 »