Key Facts Ordinance Text Full Breakdown Violations FAQ Sources More in Sarpy County

Sarpy County, NE Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

ADU rules in Sarpy County, NE, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

State Mandate: None (LB 1166 not enacted)
County Path: Zoning / special use permit
Building Code: 2018 IRC (Neb. Rev. Stat. §71-6406)
Alarms: Smoke and CO required

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Nebraska under recent ADU streamlining laws. The Sarpy County, NE rules below cover local size, height, and setback requirements.

Summary

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.

These county ordinances apply to unincorporated areas of Sarpy County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

Any county, city, or village may enact, administer, or enforce a local building or construction code if or as long as such county, city, or village: (i) Adopts the state building code; or (ii) Adopts a building or construction code that conforms generally with the state building code.

Source: Nebraska Revised StatutesView official code

Full Breakdown

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.

Violations & Fines

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.

Frequently Asked Questions

Can I build an ADU in Sarpy County?

Only where county zoning allows it, usually through a special use permit. Nebraska has no statewide ADU mandate, and LB 1166 was never enacted.

Do I need a building permit for an ADU?

Yes. Any approved unit needs a permit and must meet the 2018 IRC for egress, ceiling height, and interconnected smoke and CO alarms.

Sources & Official References

[1]Nebraska Revised Statutes

Other rules in Sarpy County

Parking Rules: Street Parking LimitsSome Restrictions Noise Ordinances: Quiet HoursSome Restrictions Shed & Carport RulesFew Restrictions Garage ConversionsSome Restrictions Tiny HomesSome Restrictions Fence Regulations: Neighbor Fence RulesSome Restrictions Animal Ordinances: Breed RestrictionsSome Restrictions Fire Regulations: Outdoor BurningSome Restrictions Fire Regulations: Brush ClearanceFew Restrictions

All Sarpy County rules

How Sarpy County compares: Easiest Cities to Build an ADU·Compare Sarpy County to another location·View the Nebraska accessory structures overview

See something wrong?

Help us keep this page accurate. If you notice an error or outdated information, let us know.