Orinda ADU Standards
Prefab ADU in Orinda
What is an Accessory Dwelling Unit (ADU)?
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 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 Orinda?
With the implementation of ADU regulations, Orinda has experienced a rise in accessory dwelling unit construction. If you’re planning to build an ADU in Orinda, LiveLarge is here to guide you through key development requirements for a smooth and successful project.
Types of ADUs:
- Detached: A new structure separate from the primary home.
- Attached: A new addition attached to the primary home.
- Conversion: Repurposing existing space within the primary residence or a detached accessory structure.
- Junior Accessory Dwelling Unit (JADU): A conversion of existing space, up to 500 square feet, contained entirely within a single-family residence.
Zoning and Lot Size:
- Single-family properties: One detached ADU is allowed, provided the lot contains an existing or proposed single-family dwelling. A JADU may also be included, but no additional ADUs are permitted.
- Multifamily properties: Up to two detached ADUs per lot are allowed, provided they are separate from the existing multifamily dwelling. These ADUs offer a great opportunity to enhance housing options while maintaining compliance with zoning regulations.
Size and Floor Area:
Attached ADU:
0–1 Bedroom: Maximum 850 sq. ft.
2 Bedrooms: Maximum 1,000 sq. ft.
Cannot exceed 50% of the primary residence’s floor area.
Detached ADU:
0–1 Bedroom: Maximum 850 sq. ft.
2 Bedrooms: Maximum 1,000 sq. ft.
JADU (Junior ADU):
Maximum 500 sq. ft.
Setbacks and Height:
- Attached ADU:
- Setbacks: 4-foot side/rear setbacks.
- Height: 16 feet.
- Detached ADU:
- Setbacks: 4-foot side/rear setbacks; 5 feet from the primary residence; front setback per the underlying zone.
- Height: 16 feet.
- Conversion of Existing Area:
- No setbacks are required for conversions of existing living areas, accessory structures, or structures rebuilt in the same location and dimensions.
- JADU (Junior ADU):
- Setbacks: 4-foot side/rear setbacks.
Parking Requirements
- One all-weather surface, off-street parking space (at least 9 feet by 19 feet) is required for the ADU.
- The parking space may be located in a required setback or as a tandem space in an existing driveway. Tandem parking means two or more cars are parked in a line, one behind the other.
- Parking is NOT required if:
- The ADU is within ½ mile walking distance of public transit (BART or a public bus stop).
- The ADU is within a historically significant district.
- The ADU is part of an existing or proposed primary dwelling or accessory structure.
- On-street parking permits are required but not offered to the ADU occupant.
The ADU is within one block of a car-share vehicle pick-up/drop-off location.
For more information, contact the Orinda Planning Division at (925) 253-4240 or via email at lcross@cityoforinda.org.
Why Choose LiveLarge for Your ADU?
LiveLarge Prefab ADUs are designed to meet Orinda’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. With our expertise in design, construction, and pre-approved plans, we ensure your project meets local standards and maximizes your property’s potential. Contact us today to start your ADU project!
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