ADU rules in Sarpy County, NE — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Nebraska has no statewide ADU mandate — the proposed LB 1166 was never enacted. In unincorporated Sarpy County an accessory dwelling is a zoning question, decided through the county's special use process, with a building permit under the adopted 2018 IRC.
Nebraska has passed no law forcing communities to allow accessory dwelling units; LB 1166 would have required one ADU by right on single-family lots but stalled. So in unincorporated Sarpy County a second dwelling is governed by the county Zoning Regulations, typically through a special use permit, and by the state building code the county must follow under §71-6406. Any approved unit needs a building permit and must meet the 2018 IRC for egress, ceiling height, and smoke and carbon monoxide alarms. Bellevue, Papillion, La Vista, and Gretna set their own ADU zoning; Omaha's by-right ADU ordinance does not reach Sarpy County.
Adding a second dwelling unit where county zoning does not allow it is a zoning violation that draws enforcement and denial of occupancy. Building without the required permit is unlawful and must be brought to code.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Sarpy County's adu rules rules stack up against other locations.
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