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ADU rules in Nebraska

Representative cities: Omaha, Lincoln.

Verify locally. Nebraska adopts the 2018 IRC as the statewide minimum (Neb. Rev. Stat. § 71-6403; R313 sprinkler and chapters 25-33 mechanical/plumbing are replaced by state codes). Counties, cities and villages choose whether to enforce locally; where they do not, the state code applies as a backstop (§ 71-6406). The 2018 IECC energy code is mandatory statewide. Omaha and Lincoln enforce locally. Permits are issued by the local building department — verify with your city (e.g., Omaha or Lincoln Building & Safety). ADU rules below are drawn from official sources — always confirm with the issuing building department before designing or building.

ADU permit rule

Permit requiredCase by casecity authority
Fee basis
Permit fees set by the municipality; verify with Omaha or Lincoln Building & Safety.
Typical timeline
Varies by municipality — ADUs with full plan review typically several weeks.
Setback
—
Area threshold
Not size-exempt
Exempt if
Not exempt
Go / no-go
case-by-case
An ADU is a dwelling-unit addition and requires a building permit plus zoning/occupancy approval. Whether an ADU is allowed is set by local zoning. Verify with your municipal building department.
ADU official sources: Nebraska Legislature — Neb. Rev. Stat. § 71-6403 (State Building Code; 2018 IRC) · City of Lincoln — Citizen Access Permit Portal (Building & Safety)
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Frequently asked questions

Do I need a permit to build an ADU in Nebraska?

Per Nebraska rules, an ADU is "yes" for a permit and the authority is "city". An ADU is a dwelling-unit addition and requires a building permit plus zoning/occupancy approval. Whether an ADU is allowed is set by local zoning. Verify with your municipal building department. Always confirm with the issuing building department.

How big can an ADU be in Nebraska?

Size limits for an ADU in Nebraska are set by local zoning — verify with your city building department.

What are the ADU setbacks in Nebraska?

Setback rules vary by city in Nebraska; confirm with the local planning or building department.

How much does an ADU permit cost in Nebraska?

Fee basis: Permit fees set by the municipality; verify with Omaha or Lincoln Building & Safety.

State-wide sources: Nebraska Legislature — Neb. Rev. Stat. § 71-6403 (State Building Code; 2018 IRC) · City of Omaha — Building Permits (Accela citizen portal) · City of Lincoln — Citizen Access Permit Portal (Building & Safety)

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