Accessory Structures in Henderson, NV

If you live in Henderson or are thinking about moving there, accessory structures are one of those things you probably won't think about until they affect you directly. Henderson has 4 specific rules on the books covering different aspects of accessory structures, and some of them might surprise you.

ADU Rules

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.

Key details: 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.

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.

Shed & Carport Rules

Henderson exempts sheds 200 square feet or smaller and 8 feet or less in height from setbacks and placement rules; larger accessory structures need a 5-foot rear and side setback and stay under a lot-coverage cap.

Key details: Permit/setback exempt: single-story, ≤8 ft tall, ≤200 sq ft. Non-exempt rear/side setback: 5 feet. Front/corner side setback: matches principal structure. Residential accessory floor cap: 10% of lot or 50% of home. Max accessory structure height: 24 feet.

Building without the required permit, or exceeding the size/setback exemption without meeting the standards, is a Development Code violation; the Director can issue notices, fines, misdemeanor citations, and order correction or removal.

Tiny Homes

Henderson caps a tiny-house accessory dwelling unit at 400 square feet, exempts it from matching the main house's design in the rear yard, and requires a permanent foundation.

Key details: Max size: 400 sq ft, excluding lofts. Foundation: Permanent foundation required. Rear-yard design match: Exempt for tiny houses. Max ADUs per lot: One. Enforcing agency: Community Development and Services Dept..

Building code and zoning compliance is enforced by the Community Development and Services Department; a tiny house without a permanent foundation, over 400 square feet, or added as a second ADU on the lot is not permitted and requires correction before final inspection or occupancy.

ADU Impact Fees

Henderson charges a residential construction tax, capped at $1,000 per unit, on new dwelling units under HMC Section 19.17, and an accessory dwelling unit counts as a unit before you get a building permit.

Key details: Fee type: Citywide residential construction tax. Cap: $1,000 per dwelling unit max. When due: Before building permit issues. ADU-specific fee: None: general tax applies. Governing section: HMC § 19.17.1–19.17.2.

Henderson won't issue the building permit until the residential construction tax is paid; there's no separate penalty schedule, but skipping payment blocks the ADU from ever being permitted.

The Bottom Line

Henderson's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Henderson is broadly strict or permissive.

Keep in mind that Henderson can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.