ADU Regulations in Orange, California (2026)

Regulations at a glance

Local rules & notes

Invalid Bedroom Restrictions: The city attempted to implement a graduated system limiting the number of bedrooms based on the square footage of the ADU, which HCD ruled as a constraint on development and potentially discriminatory. Excessive JADU Kitchen Requirements: The city's ordinance incorrectly required JADUs to have a kitchen sink and refrigeration with specific clearances; state law only requires a 'cooking facility with appliances'. Nonprofit Separate Sale Exception: While the city generally prohibits the separate sale of ADUs, it must allow an exception for properties developed by qualified nonprofit corporations per Gov. Code 65852.26.

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

Frequently asked questions about ADU regulations in Orange

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

  In Orange, 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; Orange may follow state defaults or have local limits. Verify with Orange planning for your specific lot.

• What are the setback requirements for ADUs in Orange?

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

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

  In Orange, 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 Orange or county planning for your zone.

• Is ADU approval ministerial in Orange?

  In Orange, 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; Orange planning can confirm the exact process.

• Are there parking requirements for ADUs in Orange?

  In Orange, parking for ADUs is generally Often waived per state law; check local ordinance. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Orange planning for your address.