Additional Insured Endorsements in Commercial Contracts

The certificate of insurance arrived 14 months ago, attached to an email from a mechanical subcontractor confirming its commercial general liability coverage and listing a general contractor as an additional insured. At the time, a project coordinator at the general contractor's office downloaded the document, confirmed that the contractor's name appeared in the additional insured section, and filed it electronically without further review. The certificate joined dozens of similar documents collected during the mobilization phase of a 22-month retail development project in southern Ontario, where the general contractor had been retained by a property development company to construct a multi-unit commercial plaza.

The construction contract between the property owner and the general contractor required the contractor to maintain commercial general liability insurance of not less than $5 million per occurrence and to name the property owner as an additional insured on that policy. The contract further required the general contractor to ensure that all subcontractors carried their own liability coverage of at least $2 million per occurrence and named both the general contractor and the property owner as additional insureds on those policies. Standard language in the subcontract agreements incorporated these insurance requirements by reference and obligated each subcontractor to provide certificates of insurance as evidence of compliance before commencing work.

The mechanical subcontractor completed its scope of work, which included installation of the heating, ventilation, and air conditioning systems across all 8 units in the plaza, approximately 9 months ago. Final inspections were conducted, deficiency lists were cleared, and the subcontractor's trades left the site. The general contractor's work on the project concluded 4 months later, and occupancy permits issued to the first commercial tenants shortly thereafter.

A fire originating in the mechanical room of 1 of the units caused extensive damage to 3 adjacent retail spaces last month. Preliminary investigation by the fire marshal's office has identified the HVAC installation as a potential origin point, though the final report remains pending. The property owner has notified both the general contractor and the mechanical subcontractor of a potential claim. The property owner's legal counsel has now requested copies of all insurance documentation, including the original policies and endorsements, not merely the certificates that were exchanged during construction. The general contractor's risk manager, reviewing the file for the first time since the project began, has discovered that the certificates collected during mobilization may not reflect what the underlying policies actually provide.