5 county-level rules, plus city-specific rules for 4 cities in Westchester County, New York.
Verified from official government sources
Westchester County has no countywide ADU ordinance. NY has no statewide ADU preemption. Each of the 45 municipalities sets ADU rules.
No county shed rule. Each Westchester municipality sets size, setback, and permit thresholds. NYS Uniform Code exempts sheds under 144 sq ft from a building permit.
Converting a garage to living space is a 'change of occupancy' under NYS Uniform Code requiring a municipal building permit. Westchester County has no county-level rule.
Carports are accessory structures regulated municipally. NYS code requires a permit for any roofed structure over 144 sq ft.
Tiny homes must meet NYS Uniform Code and NYS Residential Code Appendix Q (tiny houses under 400 sq ft). Westchester County has no county tiny-home rule.
4 cities in Westchester County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Westchester County — parking, noise, fences, fires, animals, pools, and more.
Westchester County Ordinance Hub →