Sonoma County, CA Home Business: Signage Rules (2026)

Signage for a home occupation in unincorporated Sonoma County is tightly restricted under Section 26-88-121 of the County Zoning Code. The rule limits a home occupation to 'one (1) attached, non-illuminated, two (2) square-foot sign.' That means the sign must be attached to the structure (not freestanding or pole-mounted), cannot be lit, and cannot exceed 2 square feet in area. This is consistent with the broader home-occupation standard that the business must not change the residential character or outside appearance of the dwelling, and must not create offsite glare or light. Any larger sign, an illuminated sign, an additional sign, or off-premises advertising would exceed what the home-occupation provision allows and would require a different land-use approval. Because the home occupation cannot alter the dwelling's exterior appearance, signage is intended to be minimal and unobtrusive. Operators should treat the single 2-square-foot attached sign as the maximum permitted identification for the business at the residence.