Riverside, CA Home Business: Zoning & Home Occupation Permits (2026)

Riverside treats home-based businesses as an accessory use layered onto residential zoning rather than a separate commercial classification. 040 caps how much of the property the business can actually occupy. Subsection (A) requires the home occupation to remain 'clearly incidental and subordinate to the primary use of the dwelling unit,' and subsection (D) limits the operation to one room of the dwelling or 25 percent of the home's total square footage, whichever standard applies to the space being used. Subsection (E) goes further and excludes accessory structures and outdoor space entirely: no shed, detached garage, backyard, or side yard can be used for storage, display, or any part of the business.

The single carve-out is an attached garage, and even that comes with a condition, the garage may be used for a permitted home occupation only if the required covered parking space stays continuously available and accessible, meaning the operator can't fill the parking bay with inventory or equipment. Subsection (C) reinforces the zoning logic by requiring 'no external visible evidence of the home occupation,' keeping the residential character of the zone intact. Together these sections mean a Riverside home business physically cannot expand beyond a single room or a quarter of the house, no matter how the zone's underlying square footage might otherwise allow.