July 1, 2024: State building codes updated, effective immediately upon signing, codes are listed below:

• IBC – International Building Code 2024
• IEBC – International Existing Building Code 2024
• IECC – International Energy Conservation Code 2018
• IMC – International Mechanical Code 2024
• IPC – International Plumbing Code 2024
• IRC – International Residential Code 2024
• NEC – National Electrical Code 2023 (remains for now)
• ISPSC – International Swimming Pool and Spa Code 2024

Summary of 2024 New Hampshire Building Code Amendments below:

There is a six month grace period (July 1, 2026 – December 31, 2026) for building permits to allow projects in queue to follow the 2021 or 2024 ICC codes.