Cupertino, CA Home Business: Signage Rules (2026)
Key Facts
- Max sign area
- 1 square foot
- Roof signs
- Prohibited
- Setback-area signs
- Prohibited
- Legal basis
- CMC § 19.120.030, Table 19.120.030
Summary
A Cupertino home occupation may display only a legally required sign, and Table 19.120.030 caps it at one square foot. The sign cannot go on the roof or inside the property's required setback area, and any other advertising or decorative signage is not permitted.
Signs Prohibit use of signs unless legally required Legally required signs are restricted to a maximum one square foot area-Signs shall not be placed on the roof or within the required setback areas
Full Breakdown
030's Signs standard is built on a simple premise stated in its own regulatory-intent column: prohibit the use of signs unless one is legally required. If a sign is legally required, it is restricted to a maximum of one square foot in area, and it cannot be placed on the roof or within the property's required setback areas. That sits alongside two related rows in the same table: Appearance requires the entrance to the home occupation space to be from within the main building with no exterior alterations not customarily found in residences, and Display bars any exterior display of merchandise or stock in trade for sale.
Read together, these rows mean a Cupertino home business cannot use signage, window displays, or exterior modifications to signal that a business is operating from the residence; the only allowance is the narrow, small legally-required sign. 040, and can require a conditional use permit if a proposed sign or use is more intense than the table anticipates, with the Planning Commission hearing any appeal.
Violations & Fines
A sign larger than one square foot, or one placed on the roof or within a required setback, violates the Signs standard in Table 19.120.030 and can be ordered removed by the Director of Community Development as part of enforcing the home occupation standards under Section 19.120.040; continued noncompliance can result in loss of the home occupation's business license tax certificate.
Frequently Asked Questions
Can I put up a sign for my home-based business in Cupertino?
Can I mount my home business sign on the roof?
What happens if my home business sign is too big?
Sources & Official References
Other rules in Cupertino
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