ADU rules in Manchester, NH — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Manchester regulates accessory dwelling units under local zoning and NH RSA 674:71 to 73 which requires all municipalities to allow ADUs by right in any zone that permits single-family dwellings.
Manchester must allow accessory dwelling units under NH RSA 674:71 to 73, enacted in 2016 and strengthened in subsequent years. This landmark law requires every municipality that permits single-family dwellings to also allow one ADU by right, making NH a leader in ADU policy. ADUs may be within or attached to the primary dwelling, or in a detached structure. Maximum ADU size is typically 750 to 1,000 square feet or a percentage of the primary dwelling. The property owner must occupy either the primary dwelling or the ADU. Separate utility connections may be required. ADUs must meet building code requirements for habitable space including egress, fire safety, and sanitary facilities. Municipalities may impose reasonable design standards but cannot prohibit ADUs entirely.
Unpermitted ADU: retroactive permit with additional fees. Non-compliant ADU: modification order. Occupancy violations: cease habitation order until corrected.
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See how Manchester's adu rules rules stack up against other locations.
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