New Hampshire

Updated 3/15/2025

Overview

New Hampshire enforces a statewide building code with amendments, establishing minimum standards that all local jurisdictions must follow. However, local jurisdictions have the authority to adopt additional requirements or stricter amendments beyond the state’s minimum standards. This means that while the state sets the baseline, some towns and cities may have more restrictive local regulations.

New Hampshire provides one consolidated amendment document that covers multiple codes, including the IRC, IPC, and NEC.

CodePro Uses the Following Codes for Answers:

Additional Resources:

For more details, click here for the state-specific regulatory document.

Additional information is available through the New Hampshire State Fire and Building Codes and the Structural Engineers of New Hampshire (SENH). The New Hampshire State Amendment Document consolidates amendments for multiple codes, ensuring compliance with state-mandated modifications.

New Hampshire has also adopted the 2021 IBC, 2021 IMC, 2018 IECC, and other specialized codes with state-specific amendments. Local jurisdictions may enforce more restrictive regulations where necessary.

Hybrid

State and Local

Hybrid Adoption

A hybrid adoption system means codes can vary at state and local level. Many times the state establishes a base code for building regulations and local jurisdictions then have the authority to amend or adopt more stringent requirements. This allows flexibility for cities and counties to tailor codes to their specific needs while maintaining a foundational standard set at the state level.

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