Effective July 1, 2024, the Planning and Community Development Department enforces the 2021 editions of the International Building Code, International Residential Code, International Mechanical Code with gas piping to conform to NFPA 54, International Plumbing Code, International Existing Building Code, International Swimming Pool and Spa Code, the 2018 edition of the International Energy Conservation Code and the 2020 edition of the National Electrical Code with State and Local amendments.
RSA 155-A:2 allows for a transistional grace period of six months as follows: The state building code in effect at the time that the application for the building permit required by RSA 155-A:4 is received by the governing authority shall remain in effect for the duration of the work covered by that permit. This requirement notwithstanding, for a period of 6 months after the effective date of the code adopted under RSA 155-A:1, IV, a concurrency period is established, allowing building permits, and other required documents, at the election of the applicant, to show compliance using either the code in effect just prior the effective date of the code adopted under RSA 155-A:1, IV, or the code adopted under RSA 155-A:1, IV, but not a combination of the 2 codes.