New Hampshire Zoning & Land Use Guide
Last updated: Verified:
Comprehensive guide to New Hampshire zoning laws, building codes, and land use regulations.
Key Facts
- Building Code: NH State Building Code (based on 2018 IBC)
- State ADU Law: Yes — ADU-friendly
- ADU Details: HB 1291 (2024) requires all municipalities in New Hampshire to allow accessory dwelling units as a permitted use on any lot that allows single-family dwellings, limiting the ability of local governments to prohibit ADUs outright.
Official Sources
Cities in New Hampshire
Bedford
Pop. 23,322
ADU: Allowed
Concord
Pop. 43,976
ADU: Allowed
Derry
Pop. 33,981
ADU: Allowed
Dover
Pop. 32,741
ADU: Allowed
Durham
Pop. 16,877
ADU: Allowed
Exeter
Pop. 16,035
ADU: Allowed
Goffstown
Pop. 18,577
ADU: Allowed
Hampton
Pop. 16,623
ADU: Allowed
Hudson
Pop. 25,965
ADU: Allowed
Keene
Pop. 23,409
ADU: Allowed
Laconia
Pop. 16,871
ADU: Allowed
Londonderry
Pop. 26,456
ADU: Allowed
Manchester
Pop. 115,644
ADU: Allowed
Merrimack
Pop. 26,632
ADU: Allowed
Milford
Pop. 15,990
ADU: Allowed
Nashua
Pop. 91,322
ADU: Allowed
Portsmouth
Pop. 22,158
ADU: Allowed
Rochester
Pop. 32,492
ADU: Allowed
Salem
Pop. 30,362
ADU: Allowed
Windham
Pop. 15,780
ADU: Allowed
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Always verify current requirements with your local planning department.