When a general contractor engages a subcontractor to install a commercial roofing system, the contractor typically requires the subcontractor to add them as an additional insured on the subcontractor's commercial general liability policy. This requirement reflects standard risk allocation practice across Canadian construction, manufacturing, and service industries. The contractor expects protection from liability arising out of the subcontractor's work, and the additional insured endorsement promises exactly that coverage. What many contractors, project owners, and their advisors fail to appreciate is that standard additional insured endorsements contain a fundamental coverage gap that emerges only after the subcontractor completes their work and leaves the project site. This gap, known as the completed operations exclusion, leaves additional insureds without coverage precisely when certain categories of serious claims are most likely to arise. Understanding why this gap exists, how it operates in practice, and what steps professionals can take to address it represents essential knowledge for anyone involved in commercial contracting, risk management, or insurance placement across Canada.
The distinction between ongoing operations and completed operations lies at the heart of commercial general liability insurance structure. Ongoing operations coverage responds to bodily injury or property damage that occurs while the named insured is actively performing work at a job site. If a subcontractor's employee drops a tool that injures a passerby, or if welding sparks ignite nearby materials during active construction, these claims fall within ongoing operations. Completed operations coverage, by contrast, addresses bodily injury or property damage that occurs after the named insured has finished their work and left the premises, where the injury or damage arises from that completed work. A roofing membrane that fails two years after installation and allows water infiltration that damages a building's electrical systems, or a mechanical system that malfunctions three years after commissioning and causes a fire, exemplifies completed operations exposure. The named insured's own policy typically covers both categories of exposure under Coverage A, with completed operations forming part of the products-completed operations hazard defined in standard Insurance Bureau of Canada commercial general liability forms used across English-speaking Canada and substantially similar forms available in Quebec adapted for civil law requirements.