New Hampshire building departments
Find local permit offices, inspection services, and official resources across New Hampshire.
Search the New Hampshire directory
How permitting works in New Hampshire
State building code, local enforcement. New Hampshire's State Building Code is based on the 2021 International Codes, with the 2018 energy code. Towns and cities that run enforcement programs issue permits and inspect.
A county name is only a geographic starting point. Depending on the address, a city, town, borough, township, or county office may issue your permit. How to check who issues your permit.
New Hampshire building codes and licensing
- Residential code
- 2021 IRC with New Hampshire amendments (State Building Code, RSA 155-A); updated by 2024 legislation and in effect since Dec. 31, 2024
- Commercial code
- 2021 IBC with New Hampshire amendments (State Building Code, RSA 155-A); in effect since Dec. 31, 2024
What is different in New Hampshire
- The 2024 update kept the 2018 IECC as the state energy code while moving the other building codes to the 2021 editions.
- RSA 155-A:2(II) let applicants choose the prior 2018 codes or the new 2021 codes for up to six months after the 2021 codes took effect.
New Hampshire department guides
Browse New Hampshire counties
Planning a project in New Hampshire?
Start with what the model codes say, then confirm local rules with the department that serves your address.