Concord ADU Standards
Prefab ADU in Concord
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.
Tiny homes, often confused with prefab ADUs, are small, mobile units built on wheels. While both can serve as ADUs, prefab ADUs are stationary and built for durability, whereas tiny homes face more zoning challenges due to their mobility.
Planning to Build an ADU in Concord?
With the implementation of ADU regulations, Concord has seen a rise in ADU construction. If you’re planning to build an ADU, 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 residence.
- Attached – A new unit attached to the primary residence.
- Conversion – A conversion of existing space within the primary home 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 & Permit Requirements
Properties zoned for single-family, two-family, or multifamily use may be eligible for ADU construction.
Size Limits
Attached ADU:
Lot size ≤ 12,000 sqft: Maximum 230 sqft
Lot size > 12,000 sqft: Maximum 460 sqft
Cannot exceed 50% of the primary residence’s floor area
Detached ADU:
Lot size ≤ 12,000 sqft: Maximum 1,000 sqft
Lot size > 12,000 sqft: Maximum 1,200 sqft
JADU (Junior ADU):
Maximum 500 sqft
Setbacks and Height
- Attached ADU:
- Setbacks: 4-foot side/rear setbacks
- Height: 16 feet
- Detached ADU:
- Setbacks: 4-foot side/rear setbacks, 10-foot distance from primary residence, and front setback per underlying zone
- Height: 16 feet
- Conversion of Existing Area:
- No setback required if converting an existing living area or accessory structure within the same dimensions as the original structure.
- JADU (Junior ADU):
- Setbacks: 4-foot side/rear setbacks
Parking Requirements
- One parking space is required unless any of the following apply:
- The ADU is within ½ mile walking distance of public transit.
- The ADU is located in a historic district.
- The ADU is part of the proposed or existing primary residence or accessory structure.
- On-street parking permits are required but not offered to the ADU occupant.
- A car-share vehicle is located within one block of the ADU.
For more details, contact the Concord Planning Division at (925) 671-3152 or via email at zoning@cityofconcord.org.
Why Choose LiveLarge Prefab ADUs?
LiveLarge Prefab ADUs are designed to meet Concord’s detached ADU regulations, offering a hassle-free way to maximize property value. With pre-approved designs and expert guidance, we streamline the approval process for a smooth experience.
Let LiveLarge be your trusted partner in your ADU journey. With our expertise in design, construction, and compliance, 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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