Union City, CA Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Union City, CA, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Side/rear setback
- 4 ft to lot line, 5 ft to structures
- Corner-lot street setback
- 20 ft if entered from side street
- Max height
- 12 ft (14 ft to match roof pitch)
- SDR trigger
- over 450 sq ft accessory coverage
- Governing chapter
- UCMC Ch. 18.32, Residential Districts
Summary
Union City treats carports as accessory structures requiring specific yard setbacks, corner-lot clearance, and site development review once combined accessory square footage tops 450 square feet.
On a corner site, garages and carports which are entered perpendicular to and from across the side lot line adjoining the street shall be located not closer than 20 feet to such lot line. ... Detached accessory structures shall be located not closer than five feet from any other structure, four feet to a side or rear lot line.
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
Under Union City Municipal Code § 18.32.020(I), a carport is an accessory structure and must sit at least 4 feet from a side or rear lot line and 5 feet from any other structure, stay on the rear half of the lot, and never sit forward of the main house. On a corner lot, a carport entered perpendicular to the street across the side lot line must be set back at least 20 feet from that lot line. Detached carports are capped at one story, 12 feet high (14 feet to match a matching roof pitch), and count toward the rule that any detached accessory structure over 450 square feet, or that pushes combined accessory building coverage over 450 square feet, triggers administrative site development review under Chapter 18.72. A carport cannot be built before the main residence it serves.
Violations & Fines
Building or converting a carport without meeting these setbacks, or without the required site development review once the 450-square-foot accessory threshold is crossed, is a zoning violation the Community Development Department can require corrected or seek permit remedies for.
Frequently Asked Questions
Can a carport be built before the house is built in Union City?
Does a carport count toward Union City's accessory structure size limits?
Sources & Official References
Other rules in Union City
How Union City compares: Shed Permit Requirements by City·California rules heatmap·Compare Union City to another location·View the California accessory structures overview
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Shed & Carport Rules in Nearby Cities
How other cities in Alameda County handle shed & carport rules.