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Napa County · Building on your lot

Running a business from home in Napa County

County rule: a home business may use 25% of the home's floor area, is run by residents only, and needs an administrative permit.

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Key points

  • Home businesses: County rule: a home business may use 25% of the home's floor area, is run by residents only, and needs an administrative permit.

Each rule below links to the section of the Napa County Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Napa County's code says

Napa County code What Napa County's code adds
Space used
  • No more than 25% of the home's gross floor area.
    § 18.104.090 · code text
    not more than twenty-five percent of the gross floor area of the dwelling unit shall be used in the conduct of the home occupation.
Employees
  • Only people who regularly live on the premises.
    § 18.104.090 · code text
    No person other than those persons who are regular residents on the premises shall be engaged in such occupations.
Permit
  • Yes. An administrative permit must be issued first.
    § 18.104.090 · code text
    No home occupation shall be allowed unless an administrative permit has first been issued for such use pursuant to Chapter 18.126.
Businesses not allowed
  • storage, warehousing or manufacturing of wine for sale on the premises when annual wine production, manufacturing and storage is two hundred gallons or more
    Applies: wine-related use on the premises or within an accessory structure located within five hundred feet of the residence
    § 18.104.090 · code text
    Storage, warehousing or manufacturing of wine for sale on the premises is allowed only if the annual wine production, manufacturing and storage on the premises or within an accessory structure that is located within five hundred feet of the residence on the premises is less than two hundred gallons.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

Can I run a business from my home in Napa County?

County rule: a home business may use 25% of the home's floor area, is run by residents only, and needs an administrative permit.

General information, not legal advice.

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Ask GoCodebook how Napa County's running a business from home rules apply to your situation and get an answer that cites the section.

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