- 2020 (NEC) National Electrical Code
- 2021 (IBC) International Building Code
- 2021 (IMC) International Mechanical Code
- 2021 (IPC) International Plumbing Code
- 2021 (IPMC) International Property Maintenance Code
- 2021 (IRC) International Residential Code
- 2015 (IECC) International Energy Conservation Code
- 2021 (IFC) International Fire Code
- 2021 (IEBC) International Existing Building Code
- 2021 (IFGC) International Fuel-Gas Code
Effective January 1st, 2023
- For City of Saint Charles listed amendments to the codes click here
- For a List of significant changes from the 2015 IRC to the 2021 IRC click here