Riverside ADU Requirements and Zoning Laws — California

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ADU Regulations in Riverside, California

Updated September 29, 2026

Inland Southern California's largest city, Riverside permits ADUs under the statewide AB 68 framework. The city's proximity to major transit corridors means many properties qualify for parking exemptions.

Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Riverside as of 2026. Regulations are governed by California's AB 68 (2020), AB 881 (2021), and AB 3182 (2024) which together establish a statewide ADU framework.

Regulation	Requirement
Maximum Size	1,200 sq ft
Property Setbacks	4 ft rear, 4 ft side
Extra Parking Required	Required (1 space, tandem OK)
Owner Occupancy	Not required

Additional Local Requirements for Riverside

ADU by right in residential zones
Minimum 150 sq ft
Height limit: 16 ft for detached
Parking waived near transit

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Frequently Asked Questions About ADUs in Riverside

Can I build an ADU in Riverside?

Riverside follows California state ADU law. Properties near transit stops may qualify for parking exemptions.

What is the maximum ADU size allowed in Riverside?

ADUs in Riverside can be up to 1,200 square feet, subject to the property's zoning and lot coverage limits. Always confirm the exact allowed size with the Riverside planning department before designing your project.

What are the setback requirements for an ADU in Riverside?

ADUs in Riverside generally require setbacks of 4 ft rear, 4 ft side. California state law (AB 68) limits local setback requirements to 4 feet for existing structures, but always verify with local zoning.

Disclaimer: This guide summarises publicly available city zoning rules and is for general information only — it is not legal or architectural advice. Codes change; always confirm current requirements with the Riverside planning department before you design or build.

Riverside ADU Zoning Rules & Permit Guide