Accessory Structures in Downey, CA (2026)
5 verified accessory structures rules for Downey, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Downey regulates ADUs under DMC §9414.08. Detached ADUs up to 1,200 sq ft allowed. Max 2 bedrooms. Height: 16 ft detached, 25 ft attached. 4-foot setbacks. Pre-approved ADU plans available through the city.
Downey ADU Rules & Regulations
Some RestrictionsShed Rules
Downey Municipal Code Article IX regulates accessory structures. Detached accessory structures and attached patio covers may occupy up to 50% of the required rear yard. Structures must comply with setback, height, and lot coverage requirements.
Downey Shed & Accessory Structure Rules
Some RestrictionsGarage Conversions
Downey allows garage conversions to ADUs under state law and DMC §9414.08. Replacement parking is not required. No minimum setback for conversions. Height limits don't apply to conversions. Driveway max 20 feet wide.
Downey Garage Conversion Regulations
Some RestrictionsCarport Rules
Carports in Downey require a building permit. They must comply with zoning setback requirements and cannot encroach into required yards without approval. Height limited per zone standards.
Downey Carport Construction Rules
Some RestrictionsTiny Homes
Tiny homes on foundations in Downey are regulated as ADUs under CA Gov Code 65852.2. Tiny homes on wheels are treated as RVs and cannot be used as permanent dwellings. ADU rules allow up to 1,200 sq ft detached.
Downey Tiny Home & Small Dwelling Rules
Some RestrictionsLooking for Los Angeles County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Downey city rules.
Accessory Structures in Los Angeles County →