San Ramon, CA Home Business: Signage Rules (2026)

12, though business cards and letterhead are excepted from that address rule. Read together, the sections mean a home business in San Ramon cannot post a yard sign, window sign, or any other exterior marker identifying the use, cannot list the residential address in advertising beyond a business card or letterhead, and cannot otherwise signal from the outside that a business operates there. 3, which permits a single sign with a maximum area of six feet that may be indirectly, but not internally, illuminated; home occupations get no equivalent allowance at all.

The no-signage rule exists because a home occupation permit is premised on the use being incidental to and indistinguishable from ordinary residential use, and any exterior sign would defeat that premise. A homeowner who wants visible on-site business identification does not have a path to it through the home occupation permit; that level of visibility takes the use outside the no-exterior-indication standard entirely.