Project contractors and subcontractors are not required to be CoC certified, according to the LEED Reference Guide.  However, vendors, suppliers, manufacturers are required to hold and provide CoC tracking numbers as the product moves throughout the

Project contractors, subcontractors, and furniture installers are not required to be CoC certified, as long as they do not modify products beyond what is required for installation, according to the LEED Reference Guide.  However, vendors, suppliers, manufacturers are required to hold and provide CoC tracking numbers as the product moves throughout the supply chain.