Callon Dietz

About Callon Dietz

Callon Dietz Incorporated is a land surveying and engineering services firm located on Adelaide Street North in the SoHo neighbourhood of London, Ontario. Serving domestic and international customers, the company provides surveying, mapping, and land information services to a variety of clients, including engineering companies, government bodies, construction firms, real estate developers, and professionals in the utility and energy industries. The company offers a comprehensive suite of services including above and below-ground surveying, geomatics, and digital terrain modelling. Specific offerings include boundary confirmation, plan compilation, geodetic surveys, and legal cadastral surveying such as Surveyor's Real Property Reports and Reference Plans. For infrastructure and utility needs, they provide Subsurface Utility Engineering (SUE) investigations—including test holes using hydro-vac excavation, CCTV investigation, and sewer mapping—as well as utility surveys for gas main installations and wind farm development. Their aerial capabilities feature photogrammetric drone (UAS) surveys for quantity and volume measurements, as well as a mobile mapping system utilizing LiDAR scanners and 360-degree spherical cameras. Established in 1967 as T.O Callon Limited, the business was renamed when Terry Dietz became a partner. The firm has grown to include offices in North Bay, Oshawa, and Carleton Place, with Callon Dietz Locates Incorporated established in 2018 to handle specialized SUE services. The company distinguishes itself through a rigorous quality assurance process; it was one of the first survey firms in Canada to achieve ISO 9001 certification, which its London head office has held for over 20 years. Additionally, the firm is COR safety certified, reflecting a commitment to a robust Occupational Health and Safety Management System.