ADU Regulations in Concord, California (2026)

Regulations at a glance

Local rules & notes

Graduated Front Setback Reduction: Berkeley uses a unique three-step objective standard to preserve front setbacks while ensuring an 800 sq. ft. unit can be built. Lot Coverage and FAR Exemption: The city explicitly excludes the first 800 square feet of an ADU from the calculations that usually limit building size on a lot. Hillside Overlay Rooftop Restriction: In the Hillside Overlay, ADU roofs cannot be used as decks or open space to mitigate fire and privacy concerns.

For the official ordinance and latest updates, check your city or county planning department.

Frequently asked questions about ADU regulations in Concord

• What is the maximum ADU size in Concord, California?

  In Concord, the maximum ADU size is typically 1000 square feet, depending on whether the unit is attached or detached. California state law allows up to 1,200 sq ft for detached ADUs and 800 sq ft for attached in many jurisdictions; Concord may follow state defaults or have local limits. Verify with Concord planning for your specific lot.

• What are the setback requirements for ADUs in Concord?

  In Concord, typical setback requirements are 4 feet from the side property line and 4 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Concord planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Concord?

  In Concord, the maximum height for an ADU is generally 20 feet. State law often allows up to 16 feet for detached ADUs and up to 25 feet when within 4 feet of the property line in some cases. Confirm with Concord or county planning for your zone.

• Is ADU approval ministerial in Concord?

  In Concord, ADU approval is typically Ministerial (by-right) per Gov Code §65852.2. Ministerial (by-right) review means the city must approve qualifying applications without discretionary review, per California Gov Code § 65852.2. Your project must still meet objective standards; Concord planning can confirm the exact process.

• Are there parking requirements for ADUs in Concord?

  In Concord, parking for ADUs is generally false. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Concord planning for your address.