Tiny home rules in Union City, CA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Union City has no standalone tiny-house ordinance. A tiny home on a permanent foundation is reviewed as an accessory dwelling unit under UCMC Chapter 18.34, while a tiny home on wheels is treated as a recreational vehicle and cannot be a permanent residence.
Union City does not have a dedicated tiny-home ordinance. A site-built tiny house on a permanent foundation can be permitted as an accessory dwelling unit under Chapter 18.34, processed ministerially with a building permit and subject to ADU size, setback, and height standards. A movable tiny house on wheels is generally classified as a recreational vehicle or trailer rather than a dwelling and is not allowed as a permanent residence on a residential lot. Junior ADUs are capped at 500 square feet. Households considering a tiny home should confirm the structure type with the Planning Division, since only foundation-based units qualify for the ADU pathway to legal occupancy.
Living in a tiny home on wheels or an unpermitted structure as a primary residence can result in code-enforcement action, fines, and orders to vacate or remove the unit.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Union City does not restrict backyard composting, and its Water Efficient Landscape ordinance (UCMC 18.112) requires compost in permitted landscape installat...
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Union City has no ordinance banning artificial turf on private property, and California Civil Code 4735 voids HOA rules prohibiting synthetic grass. For perm...
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Union City's Water Efficient Landscape ordinance (UCMC Chapter 18.112) implements California's MWELO. New landscapes of 500+ sq ft and rehab projects of 2,50...
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Union City does not prohibit residential rainwater capture. California's Rainwater Capture Act allows rooftop collection without a water right, and the City'...
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Union City's water purveyor is the Alameda County Water District (ACWD), serving the Tri-City area. ACWD enforces permanent water-waste prohibitions year-rou...
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All weeds on streets, sidewalks, and private property in Union City are declared a public nuisance under UCMC Chapter 7.08. The Fire Chief gives a ten-day no...
Side-by-side rule comparisons with other cities in Alameda County.
See how other cities in Alameda County handle tiny homes.
See how Union City's tiny homes rules stack up against other locations.
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