ADU rules in Henderson, NV β also called accessory dwelling unit regulations or granny flat ordinances β cover setbacks, owner-occupancy, parking, and permit requirements.
Henderson allows ADUs on qualifying single-family lots under HMC Title 19, subject to 2023 Nevada SB 12 standards. Permits, size caps, and parking apply, and HOA CC and Rs may further restrict.
Nevada Senate Bill 12 of 2023 updated state law on accessory dwelling units, establishing minimum allowances that Henderson and other cities must honor on single-family residential lots. Under NRS 278.04 and SB 12, a homeowner may generally build one attached or detached ADU on a qualifying lot, subject to reasonable local standards on size, setbacks, height, parking, and design. Henderson HMC Title 19 implements ADU rules with typical requirements including a maximum ADU size of 800 to 1,200 square feet or a percentage of the primary dwelling, compliance with the primary zoning setbacks, a separate entrance, and one additional off-street parking space unless waived. Short-term rental of an ADU is subject to HMC Chapter 4.11 (Short-Term Rentals) and requires a separate business license. HOAs in master-planned communities like Anthem, Green Valley Ranch, Inspirada, Cadence, and Seven Hills may restrict or prohibit ADUs through CC and Rs, which remain enforceable under NRS 116 despite SB 12 since state ADU rules generally do not override private deed restrictions.
Building an ADU without a permit is a municipal violation with stop-work orders, double fees, and possible demolition. Illegal short-term rental of an ADU is a separate violation under HMC Chapter 4.11.
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