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

• IBC – International Building Code 2021
• IEBC – International Existing Building Code 2021
• IECC – International Energy Conservation Code 2021
• IMC – International Mechanical Code 2021
• IPC – International Plumbing Code 2021
• IRC – International Residential Code 2021
• NEC – National Electrical Code 2020 (remains for now)
• ISPSC – International Swimming Pool and Spa Code 2021

Summary of 2021 New Hampshire Building Code Amendments below:

There is a six month grace period (July 1, 2024 – December 31, 2024) for building permits to allow projects in queue to follow the 2018 or 2021 ICC codes.