Rialto, CA Accessory Structures: Garage Conversions (2026)

Unpermitted Accessory Dwelling Units (ADU) or Junior Accessory Dwelling Units (JADU) constructed before January 1, 2020 may request to apply the provisions of Government Code 66332. Before making the request to the city and submitting an application for a permit, the homeowner may obtain a confidential third-party code inspection from a licensed contractor to determine the unit's existing condition or potential scope of building improvements before submitting an application for a permit. The confidential third-party code inspection is a resource for the homeowner and is not reviewed or accepted by the city. To apply the provisions of Government Code 66332 the applicant must provide clear evidence that the ADU or JADU was constructed before January 1, 2020 and that the use was a ADU or JADU. ... Once it's determined that the ADU was constructed before January 1, 2020, the second step is to ensure that the ADU does not violate the provisions listed under the Health and Safety Code for a Substandard Building. To verify, the applicant must obtain Special Inspection Investigation Permit, and the city inspector will inspect the unit under the provisions of the Health and Safety Code for a Substandard Building.