Sparks, NV Accessory Structures: ADU Rules (2026)

Section 20.03.003, part of Chapter 20.03's citywide use standards, treats an ADU as a use standard that applies "regardless of the zoning district in which the use is located," per Section 20.03.001(B), so the size and placement rules control everywhere an ADU is allowed rather than varying block by block. The code lists three legal paths to create one: build it as a brand-new structure, adapt an existing accessory building such as a detached garage or shop into one, or carve it out of part of the main house. Whichever path is used, the lot cannot be a legal nonconforming lot, and the city caps every property at a single ADU no matter how large the lot is.

Once built, the unit must sit in the established rear yard at least ten feet off the rear property line and meet the same side-yard setbacks that apply to the principal dwelling, and it must be aesthetically consistent with the main structure's architecture and materials. Size is capped at 1,000 square feet or 50 percent of the main home's floor area, whichever number is smaller, and the floor plan cannot exceed two bedrooms. Height cannot exceed two stories or the height of the principal dwelling, whichever is less. The ADU cannot receive its own street address, and it must run off the same water, electric, and gas meters as the main house rather than separate utility connections, keeping it legally tied to the property rather than functioning as an independent residence.