4 county-level rules, plus city-specific rules for 1 city in Marin County, California.
Verified from official government sources
Marin County Development Code § 22.32.100 allows home occupations as an accessory use in every residential zoning district of the unincorporated County, provided the activity is clearly secondary to full-time residential use, is not visible from the street or neighboring property, creates no off-site nuisance, does not impact on-street parking, and is limited to residents plus at most one nonresident employee. Several use types (vehicle repair, welding, mini-storage, adult businesses, dance/night clubs, etc.) are categorically prohibited.
Marin County Code, Title 22 (Development Code) § 22.32.100(B)(1), (B)(2), (B)(7)
B. Operating standards. ... 1. Accessory use. The home occupation shall be clearly secondary to the full-time residential use of the property, and shall not cause noise, odors, and other activities not customarily associated with residential uses. 2. Visibility. The use shall not require any modification not customarily found in a dwelling, nor shall the home occupation activity be visible from...
Marin County Development Code § 22.32.100(B)(3) prohibits window displays and advertising signs for any home occupation in unincorporated Marin. The only on-site identification allowed is a single name plate not exceeding one square foot in area, and no display of merchandise or stock in trade is permitted.
Marin County Code, Title 22 (Development Code) § 22.32.100(B)(3)
3. Display, signs. There shall be no window display or advertising sign(s), other than one name plate not exceeding one square foot in area. There shall be no display of merchandise or stock in trade or other identification of the home occupation activity on the premises.
1 cities in Marin County have their own home business rules. Each link goes to that city's dedicated page with code citations.
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