Antioch, CA Home Business: Signage Rules (2026)

901(B)(2) is written into the same section that authorizes home occupations, and it draws a hard line for exterior appearance generally: the residence's appearance in no way shall be altered, and the home occupation cannot be run in a manner that would cause the property to differ from its original residential character through colors, materials, construction, lighting, or signs. That flat 'or signs' clause functions as a total prohibition, since the section allows no exception, permit, or size threshold for signage tied to a home occupation, unlike the separate citywide Sign Code in Article 5 of this chapter and Chapter 6 of Title 8, which lets commercial uses apply for wall, monument, and window sign permits.

The same sentence bars outside display or storage of goods or materials, closing off yard displays, sandwich boards, or window merchandising as workarounds. 901(A) already requires that the business exhibit no external evidence of the activity, city planning staff treat any street-facing advertisement, whether a hand-painted placard, a vehicle-mounted sign parked in front of the house, or lighting calling attention to a home studio or shop, as evidence the use has stopped being a lawful home occupation. A home business that wants visible signage has only one path: convert to a commercial use in a properly zoned, non-residential location where the standard Sign Code permit process in Article 5 applies instead.