Ontario generally prohibits exterior signage for home occupations to preserve residential character. Home-based businesses cannot post storefront-style signs, window advertising, or illuminated signs on the dwelling.
Ontario Development Code (Title 9) home occupation standards typically require that no sign, window display, or other external evidence of the business be visible from the street. This aligns with the general rule in California case law protecting residential neighborhood character. Small signs required by law, such as a permit placard, and the standard house address number are allowed. Real estate open house signs and political signs are separately governed and are not treated as commercial signage. Vehicle signage (business logos or phone numbers on a personal work truck) parked overnight at the residence is typically allowed but may be cited if the truck exceeds the one-ton commercial vehicle limits under parking rules. Illuminated signs, flags, or banners advertising the business at the residence are prohibited. Cottage food operations under AB 1616 and AB 1240 are also prohibited from using commercial-style signage at the residence, though they may advertise online and at farmers markets.
Unauthorized home business signs are cited by Code Enforcement with a courtesy notice to remove, then administrative fines for non-compliance. Chronic signage violations can be grounds to revoke the home occupation permit.
Ontario, CA
Outdoor music is regulated under OMC Title 5 Chapter 29 and the special-event permit process. Venues and events with amplified sound need a city permit; resi...
Ontario, CA
Aircraft noise from Ontario International Airport (ONT) is regulated by the FAA, not the city. ONT runs an FAA Part 150 noise compatibility program; federal ...
Ontario, CA
Ontario requires a building permit for masonry walls and any fence over 7 feet under the California Building Code. Retaining walls over 4 feet also require p...
Ontario, CA
Ontario fence requirements include zoning-based heights, setbacks, sight triangles, buffer walls on industrial edges, and CBC structural standards. Pool, ret...
Ontario, CA
Ontario limits residential fence heights under the Development Code. Typical maximums are 6 feet rear/side, 3 feet front, and 42 inches in sight-distance tri...
Ontario, CA
Ontario requires dogs to be leashed off-property under OMC Title 6. Maximum leash length is 6 feet, with owner control required in all public spaces except d...
Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle signage rules.
See how Ontario's signage rules rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.