OHE is a Canadian company with the head office located in Mississauga, Ontario, and a network of satellite offices in British Columbia, Alberta, Quebec, Nova Scotia and Peterborough (Ontario). This network of offices enables OHE to provide its national clients with efficient and consistent quality services across Canada.

OHE is a multidisciplinary firm that specializes in providing high quality consulting services in the fields of Hazardous Materials, Occupational Hygiene, Building Science Engineering, Environmental Engineering and Geotechnical Engineering. OHE has provided such services to a wide base of clientele including financial institutions, property management groups, retail companies and facilities, manufacturing and pharmaceutical industries, government agencies and municipalities, health care and research facilities, insurance and legal clients.

The many consulting services offered by OHE include occupational and environmental hygiene, environmental site assessments and remediation, property condition assessments and restoration design, tendering and management, asbestos and building hazardous materials management and control, indoor air quality, building microbiological contamination (mould) management and control, environment and health and safety training and the development and implementation of environmental and health and safety management systems. Additional specialty engineering services include risk management, forensic engineering, confined space management and water/wastewater engineering, pollution prevention and auditing.

OHE provides a full range of building science engineering services to compliment the diverse needs of building owners and facility managers. These include building performance issue investigations, detailed building component condition evaluations and follow-up restoration design/tendering, construction review and contract administration services. Performance audits, reserve fund studies and other specialty services are performed for the specific needs of condominium boards of directors and property managers.