Danville ADU Standards
Prefab ADU in Danville
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 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 Danville?
With new ADU regulations in place, Danville has seen a rise in accessory dwelling unit construction. If you’re planning to build an ADU in Danville, LiveLarge is here to guide you through key development requirements for a smooth and successful project.
Types of ADUs
- Detached: A newly constructed unit separate from the primary structure.
- Attached: A newly constructed unit attached to the primary structure.
- Conversion: A converted existing space within a primary residence or detached accessory structure.
- Junior Accessory Dwelling Unit (JADU): A converted existing space, up to 500 square feet, contained entirely within a single-family residence.
Zoning and Lot Size
- A single-family residential lot may have up to three additional dwelling units in addition to the primary residence:
- 1. One interior accessory dwelling unit within a new or existing single-family home.
- 2. One junior accessory dwelling unit (JADU).
- 3. One detached accessory dwelling unit (ADU) not exceeding 800 square feet.
- In multifamily residential districts, up to two detached ADUs are allowed on a lot with existing multifamily dwellings. Additionally, portions of existing multifamily structures, such as attics, garages, or storage areas, may be converted into ADUs, provided the total number of conversions does not exceed 25% of the existing multifamily structure’s units.
Size and Floor Area
Attached ADU
0-1 Bedroom: Maximum area of 850 sq. ft.
2 Bedrooms: Maximum area of 1,000 sq. ft.
Shall not exceed 50% of the primary residence’s floor area.
Detached ADU
0-1 Bedroom: Maximum area of 850 sq. ft.
2 Bedrooms: Maximum area of 1,000 sq. ft.
Lot size < 40,000 sq. ft.: Maximum area of 1,200 sq. ft.
Lot size > 40,000 sq. ft.: Maximum area of 2,000 sq. ft.
JADU (Junior ADU)
Maximum area of 500 sq. ft.
Setbacks and Height
- Attached ADUs: 4-ft side/rear setbacks; 25-ft max height.
- Detached ADUs: 4-ft side/rear setbacks, 16-ft max height.
- Conversions: No setbacks required.
Parking Requirements
- One off-street parking space is required unless:
- Within ½ mile of public transit
- Located in a historic district
- Part of the primary residence or existing structure
- In an area where street parking permits are restricted
- Near a car-share location
- Garages converted into ADUs don’t require replacement parking.
For more details, contact the Danville Planning Division at (925) 314-3310 or via email at planning@danville.ca.gov.
Why Choose LiveLarge Prefab ADUs?
LiveLarge Prefab ADUs are designed to meet Danville’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 Danville. 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!
Get A Free Site Report
Get A Free Site Report
