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

C. Operating Requirements. Home Occupations shall comply with the following operating standards: 1. A Home Occupation shall be clearly incidental and subordinate to the primary residential use. 2. Only the occupants of the dwelling may engage in the Home Occupation. 3. Not more than one client/customer shall visit the premises at any one time, excepting in-home educational activities, including but not limited to music lessons, academic tutoring, or religious instruction, provided no more than 3 students are present at any one time and each of the operating requirements enumerated herein are complied with. 4. There shall be no change in the outward appearance of the premises. ... 6. The Home Occupation shall be conducted within an enclosed structure, completely confined to one room of the dwelling and occupying no more than 10 percent of the GFA of the dwelling, except as follows: ... 7. Only one vehicle specifically associated with the Home Occupation, no larger than a one-ton pick-up truck or van, may be maintained on the property. 8. There shall be no use or storage of materials, chemicals, compounds or equipment not typically recognized as being part of a normal household or hobby use. ... 11. The Home Occupation shall not generate vehicular or pedestrian traffic in greater volumes than normal in a residential neighborhood. ... 13. No equipment or processes shall be used that creates noise, odor, smoke, glare, dust, fumes, vibration, or result in interference with radio or television reception detectable to the normal senses outside the dwelling unit in which the Home Occupation is conducted.