ADU Regulations in Tustin, California (2026)

Regulations at a glance

Local rules & notes

ADU Accelerator Program: The city is establishing a partnership with non-profits to create a one-stop-shop comprehensive resource for homeowners interested in developing ADUs, with an emphasis on seniors and persons with disabilities. ADU Legalization and Delay of Enforcement: Tustin has established a program to allow owners with existing unpermitted ADUs to legalize the structures with a delay of enforcement per Senate Bill 13. Historic District ADU Allowance: The city explicitly states that all residentially-zoned sites within the Cultural Resource District overlay can accommodate ADUs.

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

Frequently asked questions about ADU regulations in Tustin

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

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

• What are the setback requirements for ADUs in Tustin?

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

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

  In Tustin, 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 Tustin or county planning for your zone.

• Is ADU approval ministerial in Tustin?

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

• Are there parking requirements for ADUs in Tustin?

  In Tustin, 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 Tustin planning for your address.