Union City, CA Home Business: Zoning & Home Occupation Permits (2026)
Key Facts
- Allowed districts
- RS and RM residential zones
- Floor area cap
- 20% of dwelling floor area
- Location limit
- Not in garage or accessory structure
- Operator
- Must be a dwelling resident
- Permit type
- By-right permitted use, no permit
Summary
Union City allows home occupations in RS and RM residential districts as a permitted use, but caps them at 20% of dwelling floor area and bars use of garages or accessory structures for the business.
Home occupations, subject to the following conditions:
1. That the home occupation shall be conducted within a primary or accessory dwelling unit by an inhabitant thereof and shall be clearly incidental to the use of the structure as a dwelling;
2. That the home occupation shall not be conducted in an accessory structure or in an attached garage;
3. That not more than 20% of the floor area of the dwelling shall be devoted to the conduct of the home occupation;
4. That an attached garage or detached accessory structure shall not be used as living or sleeping quarters in order to conduct the home occupation within the dwelling;
5. That the entrance to the area devoted to the home occupation shall be from within the dwelling;
6. That there shall be no exterior alteration of the dwelling and there shall be no internal alterations or construction features not customary in a dwelling;
7. That there shall be no show window or window display to attract customers, clients or the general public, and no sign shall be displayed other than a non-illuminated name plate not exceeding one and one-half (1.5) square feet in area, which shall be located flat against the wall or window of the dwelling;
8. That no one other than a resident of the dwelling shall conduct business from the dwelling; employees working off-site only may be allowed;
9.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4940544; v16 updated 2026-06-23).
Full Breakdown
Municipal Code § 18.32.020(G) permits home occupations in the RS and RM residential districts as a by-right use, not a discretionary permit. The business must be run by a resident inside the primary or accessory dwelling, stay clearly incidental to residential use, and use no more than 20% of the dwelling's floor area. It cannot operate from an attached garage or a detached accessory structure, and no living space may be converted for it. Falling outside these standards takes the home business out of the permitted-use category, exposing it to code enforcement as an unpermitted commercial use in a residential zone.
Violations & Fines
Running a home business over the 20% floor-area cap, out of a garage or accessory structure, or without residency by the operator is an unpermitted use under § 18.32.020(G); code enforcement can order it stopped or require conformance.
Frequently Asked Questions
Do I need a permit to run a home business in Union City?
Can I run my home business out of my garage?
Sources & Official References
Other rules in Union City
How Union City compares: Easiest Cities to Run a Home Business·California rules heatmap·Compare Union City to another location·View the California home business overview
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Zoning & Home Occupation Permits in Nearby Cities
How other cities in Alameda County handle zoning & home occupation permits.