ADU Regulations in Yolo County, California (2026)

Regulations at a glance

Local rules & notes

State of Emergency Occupancy: Local agencies must issue a certificate of occupancy for an ADU even if the primary dwelling is damaged and lacks one, provided a state of emergency was declared. Fast-Track Completeness Review: The permitting agency must provide written notice of application completeness or deficiency within 15 business days. Unpermitted ADU Amnesty: Local agencies cannot deny permits for unpermitted ADUs built before 2020 based on building code violations unless they are health and safety risks.

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

Frequently asked questions about ADU regulations in Yolo County

• What is the maximum ADU size in Yolo County, California?

  In Yolo County, the maximum ADU size is typically 1200 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; Yolo County may follow state defaults or have local limits. Verify with Yolo County planning for your specific lot.

• What are the setback requirements for ADUs in Yolo County?

  In Yolo County, 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 Yolo County planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Yolo County?

  In Yolo County, the maximum height for an ADU is generally 16 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 Yolo County or county planning for your zone.

• Is ADU approval ministerial in Yolo County?

  In Yolo County, 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; Yolo County planning can confirm the exact process.

• Are there parking requirements for ADUs in Yolo County?

  In Yolo County, 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 Yolo County planning for your address.