A newly installed brown metal garage door on a single-car garage
A newly installed brown metal garage door on a single-car garage. Photo: Famartin, CC BY-SA 4.0, via Wikimedia Commons.

Garage doors Union City

Union City garage doors on both sides of Mission Boulevard

Union City's Building Division draws its wildland-urban interface line along Mission Boulevard: houses east of it sit in the zone where the state's wildfire rules limit the gaps around a garage door. West of it, garage door work runs into the city's accessory unit rules more often, which let a garage become an ADU without replacing the parking but make a junior unit carved from a garage replace it on site.

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  • Rules on this page checked against 11 public sources, October 2026
Wildland-urban interface
East of Mission Boulevard, per the Building Division
Basic wind speed
85 mph, exposure B, in the city's design data
JADU in a garage
Lost parking must be replaced on site
Fire service
Alameda County Fire Department, three stations in the city

The work

What garage door calls look like in Union City

  • Closing ember gaps east of Mission

    Everything east of Mission Boulevard falls in the city's wildland-urban interface zone. The state's wildland-urban interface code limits the gaps at the bottom, sides and top of a garage door to 1/8 inch, closed with weatherstripping that passes its weathering and flammability tests, a door that laps over its jambs and header, or jambs and header covered with metal flashing. Ask the Building Division whether a replacement door at your address must meet it.

  • A garage becoming an ADU

    Union City allows an accessory dwelling unit to be made by converting a garage, as well as from existing living space or a new building. No additional on-site parking is required for an ADU, though the owner may ask for an extra driveway space on the building permit plans. The garage door then often gives way to a wall, windows and the unit's own entrance.

  • A junior unit inside the garage

    A junior ADU can sit within the house or its garage space, but the city's checklist adds a condition the full ADU does not carry: when garage space is converted for a junior unit, the parking it held must be replaced on site. The applicant must also be the owner living on the property, so plan the replacement parking before the door comes out.

  • Detached garages on corner lots

    A detached garage counts as an accessory structure in Union City. It belongs on the rear half of the lot, one story with a 12-foot height limit, at least four feet from side and rear lines and five from other buildings. On a corner site, a garage entered from the side street has to sit at least 20 feet back from that property line, which matters when widening a door that faces it.

Union City BART station and its bus plaza
Union City BART station and its bus plaza. Photo: LPS.1, CC0, via Wikimedia Commons.

The houses here

A 1970s town on ground that moves

Union City grew from about 14,700 residents in 1970 to about 39,400 in 1980, and the tract houses of that decade and the ones after it reach east to Seven Hills, below the Hillside Area that voters have protected since the 1990s. A 2020 environmental report prepared for the city notes soils with high shrink-swell potential in parts of the eastern uplands and the hillside area, clay that changes volume as its moisture changes. A garage door is the widest opening in most of those houses, and it can be where that seasonal movement shows, as a weather seal that gaps on one side or a door that drags in its tracks.

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Get quotes for garage door work in Union City

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To send a request, call or text (415) 449-8213.

Free to request, and you agree the scope and price with the person you hire before work starts. In California, a job over $1,000 in labor and materials, or one that needs a building permit, must be done by a contractor licensed by the CSLB in the right class. Ask for the license number and check it at cslb.ca.gov.

Permits and local rules

Union City and state rules on garages and their doors

  • Design data and the interface zone

    The Building Division works to the 2025 California codes and publishes the design criteria it applies: basic wind speed of 85 mph, exposure B, climate zone 3, seismic site class D, soils hazard zones east of Mission and west of Union City Boulevard, and a wildland-urban interface zone east of Mission Boulevard. Over-the-counter permits are issued at the counter during business hours.

    City of Union City Building Division (opens in a new tab)

  • ADU and JADU garage conversions

    Union City's ADU checklist allows units created by converting existing living space, a garage or a permitted detached structure, or by new construction. ADUs need no additional on-site parking. A junior ADU, limited to the house or its garage space and to an owner-occupant applicant, must replace on site any parking lost when garage space is converted.

    City of Union City Planning Division (opens in a new tab)

  • Detached accessory structures

    Private garages and carports are detached accessory structures under Chapter 18.32 of the Municipal Code. Over 120 square feet one needs a building permit, and over 450 square feet, or with water or sewer service, both planning and building permits. They sit on the rear half of the lot, may cover no more than 30 percent of the rear yard, and on a corner site a side-entry garage stays 20 feet from the street-side line.

    City of Union City Planning Division (opens in a new tab)

  • Battery backup and reversing, state law

    Section 19892 of the Health and Safety Code has barred selling or installing a residential garage door opener without a battery backup since July 1, 2019, and bars hooking a new door to an old opener that lacks one. Section 19890 requires anyone repairing an opener to test that the door reverses on a two-inch object and to tag a failed unit with a red warning notice.

    California Legislative Information (opens in a new tab)

State license for this work: D-28 Doors, Gates and Activating Devices, B General Building. Look up a contractor's license on the CSLB website (opens in a new tab).

Before you hire

Before you hire for a Union City garage door

  • East of Mission Boulevard, ask which method will close the door's side, top and bottom gaps against embers.
  • Converting the garage for a junior unit? Ask where the replacement parking will go on the plans.
  • For a detached garage on a corner lot, check the 20-foot side-street setback before widening the opening.
  • Check the D-28 Doors, Gates and Activating Devices license at cslb.ca.gov, and ask whether the opener has a battery backup.

Questions

Union City garage questions owners actually ask

Is my Union City house in the wildland-urban interface zone?

If it is east of Mission Boulevard, the Building Division's design data puts it there. That is where the state's wildfire construction rules come into play, including the limit on gaps around a garage door. The Alameda County Fire Department, which provides Union City's fire service, handles fire prevention and code compliance.

If we turn our Union City garage into an ADU, do we have to replace the parking?

Not for a full ADU: the city's checklist requires no additional on-site parking, and you may request an extra driveway space on the permit plans. A junior ADU is different. When garage space is converted for one, the parking it provided has to be replaced on site, and the applicant must be the owner living there.

Can a detached garage go anywhere in a Union City back yard?

No. It goes on the rear half of the lot, never forward of the house, at least four feet from side and rear lines and five feet from other structures, one story, with its roof's midpoint no higher than 12 feet. Together with other accessory buildings it may cover no more than 30 percent of the rear yard.

Can a contractor file a Union City garage door permit by email?

The Building Division's email or mail-in route for state-licensed contractors lists jobs such as water heater, furnace and service replacements, re-roofs and like-for-like windows, and garage doors are not on that list. Ask at the Building Division counter, open Monday through Thursday and alternating Friday mornings.

Where these facts come from

Checked against these public sources in October 2026. Rules and programs change: confirm permit requirements with the city before work starts, and a contractor's license on the CSLB website.

Garage door work in Union City? Tell us what you see.

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