Danville, California

Zoning

All properties zoned for single family, two-family or multifamily may be eligible to build ADUs.

Number of units

The number of ADUs you’re able to build depends on how your lot is zoned:

• Lots zoned for single family use may add 1 ADU and 1 Jr. ADU (JADU).
• Lots zoned for two-family or multi-family may add up to 2 detached ADUs per lot or up to 25% of the existing units in the building if conversions of existing non-living space.

Building size

The maximum ADU you can build depends on the ADU type:

• The maximum size is 500 sq. ft. for a JADU
• ADUs in districts zoned with a maximum lot size less than 40,000 square feet: 1,200 square feet, but shall not exceed 50% of primary residence. ADUs in districts zoned with a maximum lot size more than 40,000 square feet: 2,000 square feet, but shall not exceed 50% of primary residence.

Building height

Detached and Attached ADUs can reach a maximum height of 16 feet. The maximum height (16 feet) can be exceeded to accommodate an ADU constructed entirely within the exterior physical dimensions of an existing principal residence, multifamily dwelling, or accessory building legally constructed with a building permit or a proposed principal residence. In no case shall the ADU have a building height greater than the existing building or sixteen feet, whichever is greater

Setbacks

Minimum setbacks of 4 feet from the side and rear lot lines.

Parking

One parking spot required unless any of the following true:

• The accessory dwelling unit is located within one-half mile walking distance of public transit.
• The accessory dwelling unit is located within an architecturally and historically significant historic district.
• The accessory dwelling unit is part of the proposed or existing primary residence or an accessory structure.
• When on-street parking permits are required but not offered to the occupant of the accessory dwelling unit.
• When there is a car share vehicle located within one block of the accessory dwelling unit.

Owner-occupancy

Owner occupancy is not a requirement for permitting an ADU from January 1, 2020 until January 1, 2025. This is a great opportunity for rental property owners to increase their yields in a cost-effective way.

Rental

While long-term rentals are permitted for ADUs, short-term rentals (e.g. Airbnb for less than 30 days) are not permitted in the city.

Watch-outs

Are you in a creek protection area? Do you have a utility easement over your property? Reach out to us and we’ll help you build a custom ADU to fit your unique property characteristics and local regulations!

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