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All ADU Regulations

Concord, California

Concord has updated its ADU ordinance to comply with new state laws. Below are the up-to-date requirements to build an ADU in the city.
Updated Sep 24, 2021

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
  • 850 sq. ft. for a one bedroom detached ADU
  • 1,200 sq. ft. for a 2+ bedroom detached ADU
  • Attached ADUs may not exceed 50% of the gross floor area of the existing principal residence. The 50% limitation does not apply if the ADU is 800 square feet or less.

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 16 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!

Want to learn more about ADU regulations in your area?

Book a free consultation and estimate with a Cottage ADU Expert to find out what’s possible on your property!