The 2018 International Energy Conservation Code, IECC, is an Overlay Code - it's requirements impact and modify the requirements in other adopted code standards. These include- design, construction methods, materials, and inspections. Compliance is required for both Commercial or Residential.
Charles County Government produced literature addressing the IECC.
Commercial requirements are HERE.
It is incumbent all permit holders understand the requirements of this code, as it may significantly impact other aspects of construction.
If you have questions on these codes, please do not hesitate to contact our offices for help.