ADU rules in Westchester County, NY — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Westchester County has no countywide ADU ordinance. NY has no statewide ADU preemption. Each of the 45 municipalities sets ADU rules.
ADU legality varies widely across Westchester. Some towns (e.g., Greenburgh, New Castle) permit accessory apartments with a special permit; others restrict them heavily. The state's 'Plus One ADU' grant program (up to $125,000) is available in eligible municipalities. Check your municipal zoning code.
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See how Westchester County's adu rules rules stack up against other locations.
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