Napa County Code 18.104.090 limits home occupations to the dwelling itself (no accessory buildings), confines them to 25% or less of the dwelling's gross floor area, restricts work to resident-occupants only, and prohibits any off-lot detectable noise, vibration, glare, fumes, odors, or electrical interference.
Under NCC 18.104.090, the home occupation must be 'clearly incidental and subordinate' to the residential use, and not more than 25% of the gross floor area of the dwelling unit may be used for it. Only persons who are regular residents on the premises may be engaged in the occupation - non-resident employees are not allowed. The home occupation may not be conducted in any accessory building. There must be no change in the outside appearance of the building or premises, and no visible evidence of the conduct of the home occupation. Sales are limited to merchandise produced on the premises or directly related to the services offered. Traffic generated by the home occupation may not exceed what is normal for a residential neighborhood, and parking generated by the home occupation must be off-street and outside any required front yard. No equipment or process may be used that creates noise, vibration, glare, fumes, odors or electrical interference detectable off the lot to the normal senses; electrical equipment may not cause visual or audible interference in any off-premises radio or television receivers or cause off-premises line-voltage fluctuations. The nature or type of occupation is a material part of the permit, meaning a change of business activity requires a new or modified permit. Wine storage, warehousing, or manufacturing for on-premises sale is allowed only if annual wine production, manufacturing, and storage on the premises (or in an accessory structure within 500 feet of the residence) is less than 200 gallons, the U.S. TTB form is submitted annually, and no on-site sales occur.
Exceeding the 25% floor-area cap, employing non-residents, operating in an accessory building, generating off-lot noise/odor/vibration/glare, or changing the type of occupation without amending the permit are all zoning violations under Title 18 enforceable through PBES Code Compliance. Remedies include notices of violation, administrative citations under the County Code, abatement, and revocation of the Home Occupation Permit.
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