About costs, it is difficult to answer because ISO 14001:2015 imposes nothing that the legislation does not impose. Thus, the costs incurred to comply with the legislation are not imposed by ISO 14001: 2015. Other costs are implementation and maintenance costs for the management system. For example, I’m currently working with a manufacturing company where costs of waste disposal are going to be reduced because of introducing waste segregation and recycling and by avoiding landfill.
You can find more information about ISO 14001 below: