Antioch ADU Standards
Prefab ADU in Antioch
What is an ADU (Accessory Dwelling Unit)?
An ADU is an independent residential unit on the same lot as a primary home, providing additional living space, rental opportunities, or multi-generational housing. A Prefab ADU is a permanent, factory-built backyard home that meets local zoning and building codes, making it ideal for long-term living.An ADU is an independent residential unit on the same lot as a primary home, providing additional living space, rental opportunities, or multi-generational housing. A Prefab ADU is a permanent, factory-built backyard home that meets local zoning and building codes, making it ideal for long-term living.
Tiny homes, often confused with prefab ADUs, are small, mobile units built on wheels. While both can be considered ADUs, prefab ADUs are stationary and built to last, whereas tiny homes face more zoning challenges due to their mobility.
Planning to Build an ADU in Antioch?
With updated ADU regulations, Antioch has seen a rise in ADU construction. If you’re planning to build an ADU in Antioch, LiveLarge is here to guide you through the process.
Types of ADUs
- Detached – A new construction separate from the primary home.
- Attached – A new construction attached to the primary home.
- Conversion – Transforming an existing space within a home or detached structure.
- Junior ADU (JADU) – A converted space (≤500 sq. ft.) within a single-family home.
Zoning & Permit Requirements
ADUs are allowed in single-family and multifamily zoning districts but require an administrative use permit approved by the Zoning Administrator before a building permit can be issued.
Size Limits
Attached ADUs
0-1 bedroom: Up to 850 sq. ft.
2 bedrooms: Up to 1,000 sq. ft.
Cannot exceed 50% of the primary home’s floor area.
Maximum size: 1,200 sq. ft.
Detached ADUs
0-1 bedroom: Up to 850 sq. ft.
2 bedrooms: Up to 1,000 sq. ft.
Maximum size: 1,200 sq. ft.
JADUs – Max 500 sq. ft.
Setbacks and Height
- Attached ADUs
- Setbacks: 4-ft side/rear setbacks
- Height: Up to 16 ft.
- Detached ADUs
- Setbacks: 4-ft side/rear setbacks, 5 ft. from the primary residence, 30-ft front setback
- Height: Up to 16 ft.
- Conversions – No setbacks required if using an existing structure.
Parking Requirements
- One off-street parking space per unit or per bedroom (tandem or driveway parking allowed).
- If a garage, carport, or covered parking structure is demolished for an ADU, the required replacement spaces may be configured anywhere on the lot (e.g., covered, uncovered, or tandem).
- Parking requirements may be waived if:
- The lot was developed before January 1964 and is smaller than 6,000 sq. ft.
- The ADU is a JADU or located in an existing accessory structure.
- The ADU is within ½ mile of public transit.
A car-share vehicle is within one block. - The ADU is in a historic district.
- On-street parking permits are required but not available for ADU residents.
For more details, contact the Antioch Planning Division at (925) 779-7065 or via email at mvillagrana@antiochca.gov.
Why Choose LiveLarge Prefab ADUs?
LiveLarge Prefab ADUs are designed to meet Antioch’s detached ADU regulations, offering a hassle-free way to maximize property value. With pre-approved designs and expert guidance, we ensure a smooth approval process.
Let LiveLarge be your trusted partner in your ADU journey in Antioch. With our expertise in design, construction, and pre-approved plans, we help ensure your project aligns with local standards and maximizes your property’s potential. Contact us today to start your ADU project!
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