ADU Regulations in Riverside, California
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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Can I build an ADU in Riverside?
Riverside follows California state ADU law. Properties near transit stops may qualify for parking exemptions.
How big can my ADU be in Riverside?
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 about setbacks and other requirements in Riverside?
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.
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