1 county-level rule, plus city-specific rules for 1 city in Napa County, California.
Verified from official government sources
Napa County allows limited home-based businesses ('home occupations') in residential zones under Napa County Code Section 18.104.090, but only after the operator obtains an administrative permit. The home occupation must be incidental and subordinate to residential use, occupy no more than 25% of the dwelling's gross floor area, be conducted only by persons who are regular residents of the premises, generate no exterior change in appearance, produce no off-lot noise or odor, be conducted only inside the dwelling (not in accessory buildings), and generate no traffic above normal residential levels.
1 cities in Napa County have their own home business rules. Each link goes to that city's dedicated page with code citations.
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