IEBC 2021 adopted as PA UCC effective October 2022
IECC2021
International Energy Conservation Code
ICC·Energy
IECC 2021 adopted as PA UCC effective October 2022
IFC2021
International Fire Code
ICC·Fire Safety
IFC 2021 adopted as PA UCC effective October 2022
IFGC2021
International Fuel Gas Code
ICC·Fuel Gas
IFGC 2021 adopted as PA UCC effective October 2022
IMC2021
International Mechanical Code
ICC·Mechanical
IMC 2021 adopted as PA UCC effective October 2022
IPC2021
International Plumbing Code
ICC·Plumbing
IPC 2021 adopted as PA UCC effective October 2022
IRC2021
International Residential Code
ICC·Residential
IRC 2021 adopted as PA UCC effective October 2022
NFPA 702020
National Electrical Code
NFPA·Electrical
NEC 2020 (NFPA 70) adopted statewide
Important Notes
Pennsylvania adopted the 2021 ICC codes as the Uniform Construction Code (UCC) effective October 2022. The UCC is mandatory statewide — municipalities can enforce locally or defer to L&I third-party agencies. PA spans Climate Zones 4A (southeast), 5A (central), and 6A (north/mountains). Snow loads range from 25 psf (southeast) to 40 psf (northwest/mountains). Erie County has lake-effect snow considerations. Mine subsidence is a concern in western PA coal regions — the Mine Subsidence Insurance (MSI) Fund provides coverage. Radon mitigation is important statewide — PA has some of the highest radon levels in the US. Philadelphia (jurisdiction ID 58) has its own building department and additional local codes.