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Henderson, NV Accessory Structures: ADU Rules (2026)

Some Restrictions

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

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

Key Facts

Max size: 25% of home's floor area or 1,000 sq ft
Tiny house ADU cap: 400 square feet
Max ADUs per lot: One
Detached ADU setback (≤14 ft tall): 5 feet side/rear
Resale rule: Cannot be sold apart from main house

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 Nevada under recent ADU streamlining laws. The Henderson, NV rules below cover local size, height, and setback requirements.

Summary

Henderson caps accessory dwelling units at 25% of the main home's floor area or 1,000 square feet, whichever is greater, and allows only one ADU per lot.

ii. Maximum Size. Accessory dwelling units shall be no more than 25 percent of the floor area of the principal dwelling or 1,000 square feet in size, whichever is greater, except that a tiny house may be no larger than 400 square feet (excluding lofts) or as otherwise defined in the International Residential Code. An attached garage is not considered part of the accessory dwelling unit for the purposes of determining maximum size.
iii. Maximum Number. There shall be no more than one accessory dwelling unit on a lot.
iv. Density. Accessory dwelling units shall not count toward any applicable maximum residential density requirements.
v. Design. Except as noted below, accessory structures shall be designed to be aesthetically compatible with the principal structure and the neighborhood character in terms of building materials, colors, and building mass. Compatibility shall be measured in terms of building materials, colors, and building mass.
(a) If located in the Front or Corner Side Yard, the building design (materials, roof, color) must match the principal structure.
(b) If located in the rear yard, a tiny house is exempt.
(c) A tiny house must be placed on a permanent foundation.
https://online.encodeplus.com/regs/henderson-nv/doc-viewer.aspx#secid--1
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8/11/26, 11:49 PM
Document Viewer | Development Code

Source: Nevada SB 12 ADU LawView official code

Full Breakdown

Henderson's Development Code lets homeowners add one accessory dwelling unit per lot, detached, attached, or built into the primary residence. Size is capped at 25% of the principal dwelling's floor area or 1,000 square feet, whichever is greater (tiny houses cap at 400 square feet). Detached ADUs 14 feet or less in height get a reduced 5-foot side and rear setback; taller units must meet the same setbacks as the main house, and front/corner side setbacks always match the principal dwelling. ADUs can't be sold separately from the main house.

Violations & Fines

Building beyond the size cap, adding a second ADU, or violating setbacks without a variance risks a stop-work order and code enforcement action through Community Development and Services; unpermitted units also can't get a certificate of occupancy.

Frequently Asked Questions

Can I build more than one ADU on my Henderson lot?

No. Henderson's Development Code allows no more than one accessory dwelling unit on a lot, regardless of lot size.

How big can a Henderson ADU be?

Up to 25% of the principal dwelling's floor area or 1,000 square feet, whichever is greater; a tiny house ADU is capped at 400 square feet.

Sources & Official References

[1]Henderson Development Code § 19.9.4.B.6

Other rules in Henderson

Noise Ordinances: Construction HoursSome Restrictions Shed & Carport RulesSome Restrictions Tiny HomesSome Restrictions ADU Impact FeesSome Restrictions Parking Rules: Curb Color RulesSome Restrictions Parking Rules: EV ChargingSome Restrictions Fence Regulations: Material RestrictionsSignificant Restrictions Fence Regulations: Fence Permit RequirementsSome Restrictions Fire Regulations: Smoke DetectorsSome Restrictions

All Henderson rules

How Henderson compares: Easiest Cities to Build an ADU·Compare Henderson to another location·View the Nevada accessory structures overview

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