ADU Regulations in Vallejo, California
Situated in Solano County in the North Bay, Vallejo benefits from California's streamlined ADU laws while maintaining local design review standards. The city views ADUs as key to meeting its Regional Housing Needs Allocation (RHNA) targets.
Below is a summary of the key zoning rules applicable to Accessory Dwelling Units in Vallejo 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 | Not required |
| Owner Occupancy | Not required |
Additional Local Requirements for Vallejo
- ADU by right in residential zones
- Minimum 150 sq ft
- Maximum 16 ft height
- Conversion of garages allowed
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Can I build an ADU in Vallejo?
Vallejo follows California state ADU law. The city encourages ADU construction as part of its housing element plan.
How big can my ADU be in Vallejo?
What is the maximum ADU size allowed in Vallejo? ADUs in Vallejo 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 Vallejo planning department before designing your project.
What about setbacks and other requirements in Vallejo?
What are the setback requirements for an ADU in Vallejo? ADUs in Vallejo 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.