ADU rules in New Haven, CT — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
New Haven allows accessory dwelling units in certain residential zones. Connecticut passed statewide ADU legislation expanding rights to build ADUs. Units must meet zoning standards for size, setbacks, and parking.
Connecticut enacted Public Act 21-29, expanding the right to build ADUs statewide. New Haven's zoning has been updated to comply with state law. ADUs are permitted as-of-right in many residential zones. They must be subordinate to the primary dwelling, meeting size limits typically around 800-1,000 square feet. Setback, parking, and design standards apply. Owner occupancy of either the primary dwelling or ADU may be required depending on the zone.
Unpermitted ADUs face zoning enforcement and must obtain proper permits. Non-compliant units may be required to cease occupancy.
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Side-by-side rule comparisons with other cities in New Haven County.
See how other cities in New Haven County handle adu rules.
See how New Haven's adu rules rules stack up against other locations.
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