ADU Guide · Verified 2026
Building an ADU in Nevada
Nevada requires ADU accommodation only in jurisdictions covered by a population threshold under AB 383, not uniformly statewide. Las Vegas specifically still requires owner occupancy of the primary home if the ADU itself is going to be rented, a real exception to the no-owner-occupancy trend most other states' laws follow.
Quick Facts
Statewide floors set by AB 383 (2021), NRS Chapter 278C. Your city may be more generous but cannot go below them.
The Three Types of ADU
A vaguer standard than a fixed number
Rather than setting one specific statewide size cap, AB 383 requires covered jurisdictions to avoid limits that would "effectively prohibit" ADU development, a real, deliberately flexible legal standard rather than a hard number, leaving more room for local interpretation than most other states' laws in this research.
A real exception to the no-occupancy trend
While most states covered here eliminated owner-occupancy requirements as part of their ADU reform, Las Vegas specifically still requires the primary residence to be owner-occupied if the homeowner wants to rent out the ADU itself, a genuine local exception to the broader national pattern.
A real proposal still waiting on passage
Legislation that would extend ADU coverage to counties over 60,000 population has been proposed but had not passed as of this research, worth tracking but not yet law.
What people get wrong
The most common mistake is assuming Nevada's ADU rules apply uniformly statewide. Coverage depends on a population threshold, and even within covered Las Vegas, the owner-occupancy requirement for a rental ADU is a real exception most homeowners don't expect.
From Idea to Move-In: The Timeline
Who Administers It
Counties With Their Own Rules
These Nevada counties have verified, county-specific ADU rules that add to the state baseline:
Building It Yourself? Here's What You'll Need
Planning an ADU? Tools homeowners use in the design and layout phase:
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Check Your Local Rules
Your city may allow more than the state floor
State law sets the minimum; many Nevada cities and counties are more generous. Browse the full directory of 17 counties and every city in Nevada for local rules, fees, and building department contact details.
Browse the full Nevada directory →Not sure if your project needs a building permit, a zoning approval, or both? See our guide to building permits vs. zoning approval.
Official Sources
ADU law changes frequently and local ordinances add detail. This guide is general information, not legal advice, always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated September 2026.