ADU rules in Vallejo, CA — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Vallejo regulates ADUs and JADUs under Vallejo Municipal Code Chapter 16.303 (Accessory Dwelling Units). Detached ADUs are capped at 1,200 sq ft, attached ADUs at 1,200 sq ft or 50% of the primary dwelling (whichever is less), and JADUs at 500 sq ft within the existing single-family structure.
VMC Chapter 16.303 implements California Government Code §65852.2 with a ministerial 60-day review for complete ADU applications. New construction detached ADUs are limited to 16 feet in height, with a 4-foot minimum side and rear setback. One ADU plus one JADU is permitted on a single-family lot. Parking is generally not required when the property is within a half-mile of transit or qualifies for another state exemption. The property owner records a deed restriction with Solano County that prohibits short-term rental use and prohibits separate sale of the ADU from the primary dwelling — this deed restriction is not required for ADUs permitted between January 1, 2020 and January 1, 2025, consistent with state law amendments.
Unpermitted ADUs violate VMC Chapter 16.303 and are enforced by Vallejo Code Enforcement with administrative citations and required compliance. Renting an ADU on Airbnb or for stays under 30 days violates the recorded deed restriction and the state ADU statute.
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Side-by-side rule comparisons with other cities in Solano County.
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