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.
First incorporated in 1954, ONSA has steadily grown in size and areas of specialization. We are proud to be the longest standing M&E consulting firm in Nova Scotia with over 8,000 commissions successfully completed to date. The foundation of our growth over the years has been the result of paying particular attention to detail and emphasis on commitment and skill by every staff member, resulting in high levels of repeat business from our clients. The complexity and diversity encountered in the multitude of diverse projects has developed the experience and skill sets essential for quality service and successful projects.