Accessory Structures in Martinez, CA (2026)
3 verified accessory structures rules for Martinez, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Martinez complies with California Gov Code §65852.2 (statewide ADU law). One ADU and one JADU (up to 500 sq ft) are permitted per single-family lot. Detached ADUs up to 1,200 sq ft; attached up to 1,000 sq ft or 50% of primary home. 4-ft rear/side setbacks for new detached ADUs. ADUs under 750 sq ft exempt from impact fees. ADUs cannot be used as STRs per city's STR prohibition.
Martinez ADU (Accessory Dwelling Unit) Rules
Some RestrictionsShed Rules
Accessory structures in Martinez require building permits unless very small, non-habitable, and under ~120 sq ft with no utilities. Structures must comply with setback requirements (typically 5 ft from side/rear property lines in residential zones). Maximum height is governed by Title 22 zoning code.
Martinez Shed & Outbuilding Rules
Some RestrictionsGarage Conversions
Martinez regulates ADU and JADU development under Martinez Municipal Code Chapter 22.43, consistent with California Government Code §65852.2. Garage conversions are by-right with no replacement parking required, no minimum lot size, and existing garage setbacks preserved for the conversion footprint.
Martinez CA Garage Conversion to ADU
Few RestrictionsLooking for Contra Costa County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Martinez city rules.
Accessory Structures in Contra Costa County →