Rialto Municipal Code Ch. 18.78 (Sign Regulations) governs signs citywide. Consistent with standard California home-occupation rules, signs advertising a home occupation are prohibited on residential property — the use must produce no external evidence of business activity visible from the public right-of-way. Vehicle signage on personal vehicles is permitted under Cal. Veh. Code and First Amendment commercial-speech protections, but on-premises advertising signs are not allowed at a home office.
Rialto Code §18.78 (Sign Regulations) and §18.78.130 (Section) regulate signs by zoning district. Residential zones permit only limited identification signs (address, nameplate); commercial advertising signage is prohibited. Because a home occupation must remain accessory and invisible from the exterior under Title 18 zoning standards, no business sign — including window decals, A-frames, banners, or yard signs advertising goods or services — may be displayed at a home-occupation site. Temporary signs (real estate, political, garage sale) are governed separately. Vehicle wraps and magnetic signs on a personal vehicle parked at the residence are not 'on-premises signs' under the sign code, but a commercial vehicle stored at the residence may trigger separate parking and zoning restrictions.
Unpermitted signs in residential zones are a Title 18 violation enforced by Community Compliance; abatement orders may require removal within 10–30 days and unpaid fines may be assessed as municipal liens.
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