Union City ADU Standards
Union City ADU Standards: LiveLarge Home Guide

If you’re considering building an ADU or JADU in Union City, LiveLarge Home is here to guide you through the city’s regulations and ensure your project is a success. Below is a summary of the key requirements and steps for building an ADU in Union City.
ADU Types:
- Repurposed ADU: Conversion of existing space such as a garage or detached structure.
- Detached ADU: A newly built, independent unit on your property.
- Junior Accessory Dwelling Unit (JADU): A small unit within an existing single-family home.
Maximum Size:
- ADU:
- 850 sq. ft. for studio/1-bedroom
- 1,000 sq. ft. for 2+ bedrooms
- JADU: Maximum 500 sq. ft.
General Information: ADUs are an excellent way to add valuable living space to your property, whether for family members, renters, or as a potential rental income source. These units contribute to Union City’s housing goals while offering flexibility for homeowners.
Key Regulations:
Detached ADU:
- Maximum Height: 18 feet, or 16 feet if within a flood zone.
- Setbacks: At least 4 feet on the side and rear yards.
- Separation: Minimum of 5 feet from other structures on the property.
Attached ADU:
- Maximum Height: As per zoning regulations, typically up to 16 feet.
- Setbacks: Same as the primary dwelling.
- Separation: At least 5 feet from other structures.
JADU:
- Maximum Height: Same as the primary dwelling.
- Setbacks: N/A for JADUs.
- Separation: At least 5 feet from other structures.
Kitchen Requirements:
- ADU: Must include a full kitchen with sink, refrigerator, cooktop/oven, and adequate counter space.
- JADU: Must include a kitchenette (e.g., countertop cooking appliance, sink, and refrigerator).
Application Process:
- 1. Review Regulations: Confirm zoning compliance and building codes by contacting the Planning and Building Divisions.
- 2. Submit Building Permit: Prepare and submit your plans to the Building Division.
- 3. Permit Issuance & Construction: After any necessary revisions, your permits will be issued, and you can begin construction.
- 4. Inspections & Occupancy: Schedule inspections as required. Once the ADU or JADU passes, it is ready for occupancy.
For more information, contact the Union City Planning Division at (510) 675-5379 or via email at planning@unioncity.org.
Let LiveLarge Home be your trusted partner for your ADU journey in Union City. With our expertise in design, construction, and pre-approved plans, we ensure your ADU project aligns with local standards and maximizes your property’s potential. Contact us today to start your ADU project!
Get A Free Site Report
Get A Free Site Report

About Us