3 county-level rules, plus city-specific rules for 3 cities in Solano County, California.
Verified from official government sources
Solano County allows one Accessory Dwelling Unit and one Junior ADU per single-family lot in unincorporated areas under Solano County Code §28.72.10(B)(2), as amended by Ordinance 2020-1817 to conform with California Government Code §65852.2. Detached ADUs require 4-foot side and rear setbacks, and one off-street parking space is required unless the property is within ½ mile of public transit.
In unincorporated Solano County, one-story detached sheds used for tool and storage uses, playhouses, and similar accessory purposes are exempt from building permits when the floor area does not exceed 120 square feet and the structure has no utilities. Sheds over 120 sq ft, or any shed with electrical, plumbing, or mechanical service, require a building permit under Chapter 28.
In unincorporated Solano County, converting a garage into living space requires a building permit through the Solano County Building and Safety Division. Conversions of an existing garage into habitable space are most commonly permitted as a Junior Accessory Dwelling Unit (JADU) or Accessory Dwelling Unit (ADU) under Solano County Code §28.72.10, as amended by Ordinance 2020-1817.
3 cities in Solano County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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