ADU rules in Henderson

ADU defined as a building or structure, including a tiny house, on the same lot as a principal dwelling, 'either detached, attached, or built within the primary residence'. Permitted subject to use-specific standards ('S') in the RS, RM, RH, MC, and MN zoning districts per Table 19.9.1-2; not permitted in other districts (including RMH and MR).

Same provision covers attached ADUs and units built within the primary residence; an ADU built closer than six feet to the principal structure must be attached to it by a roof at least ten feet wide (or the width of the accessory structure, whichever is less).

One ADU per lot; ADUs do not count toward maximum residential density.

No owner-occupancy requirement appears anywhere in the ADU standards (19.9.4.B.6) or elsewhere in 19.9.4; the only use limitation is that the ADU may not be sold separately from the principal dwelling. Owner occupancy matters only if the ADU is used as a short-term rental (2-night minimum booking drops to 1 night when owner-occupied).

Off-street parking table line item 'Accessory Dwelling Unit: 1 per ADU'. Consistent with AB 396's cap of no more than one additional space.

Use table designation is 'S': permitted by right subject to the use-specific standards of 19.9.4.B.6 (no conditional use permit or discretionary hearing). A building permit is required for accessory structures over 200 sq ft or with mechanical/electrical/plumbing work (19.9.3.A.2).

AB 396 (2025) bars Henderson from prohibiting ADU rental housing but allows banning transient lodging in ADUs; Henderson has not enacted an ADU-specific STR ban, so the general STR rules control.