The 2021 South Carolina Building Code represents a comprehensive suite of model building standards rooted in the 2021 editions of the International Codes—such as IBC, IRC, IFC, IPC, IMC, and IFGC—plus the 2020 NEC and the 2009 Energy Conservation Code. Officially adopted in October 2021 and enforceable from January 1, 2023, these codes feature South Carolina–specific amendments tailored to state laws and environmental contexts. This ensures that building practices across the state consistently prioritize occupant safety, accessibility, and energy efficiency while fulfilling statutory public safety mandates.

Key Aspects:

Code Adoption & Enforcement

• The South Carolina Building Codes Council adopted the 2021 editions of major model codes—with custom modifications—in a meeting held October 6, 2021, and set the statewide enforcement date for January 1, 2023
  
• These adopted codes, now mandatory across all municipalities and counties in South Carolina, serve as the minimum construction standards statewide

Codes Included in the 2021 South Carolina Building Code

This edition comprises:

• International Building Code (IBC) 2021 with SC modifications
  
• International Residential Code (IRC) 2021 with SC modifications
  
• International Fire Code (IFC) 2021 with SC modifications
  
• International Plumbing, Mechanical, and Fuel Gas Codes (2021) with SC modifications
  
• 2009 Energy Conservation Code (SC Energy Standard Act)
  
• 2020 National Electrical Code (NFPA 70) with SC modifications

 Accessibility & Energy Standards

• The latest ICC/ANSI A117.1 (“Accessible and Useable Buildings and Facilities”) is legally adopted under South Carolina’s Accessibility Act and mandatory in all jurisdictions.
  
• The Building Energy Standard Act is also adopted by statute, enforcing the energy conservation provisions of the 2009 code statewide

Modular Building Transition

• Structures with plans approved under the 2018 SC codes could continue using the earlier labels until December 31, 2022. Starting January 1, 2023, all new modular buildings must be approved under the 2021 SC codes

Highlights:

• Adapt provisions to South Carolina’s unique environmental and geographical conditions.
• Provide clarity on local enforcement and compliance requirements.
• Ensure consistency with other state regulations and policies.