Downey, CA Accessory Structures: Shed & Carport Rules (2026)

Section 8999.28(b)(1)(i) exempts one-story detached accessory structures used as tool and storage sheds, playhouses and similar uses from Downey's building permit requirement, but only up to 120 square feet of floor area. Go over that line and the shed becomes a permitted structure: the owner must apply to the Building Official, pay the fee set in the City of Downey Schedule of Fees, and pass inspection like any other building.

Section 9534.22 sets the placement rules for every detached accessory building on a residential lot, permitted or exempt. No detached accessory building may sit within five feet of the front half of an adjoining lot, defined as the front 50 feet of that lot's depth. On a street-side corner lot, no accessory building is allowed anywhere in the required street side setback area. A detached garage taking access from a side street or alley needs at least 20 feet of setback from the street property line, or 26 feet measured from the opposite side of the alley. The code also spaces accessory buildings from each other on the same lot: a detached accessory building must stay at least 10 feet from any other building, except a detached garage, which may come within 5 feet of the main house; garage separation must also satisfy Section 9710. The setback standards were last amended by Ordinance 21-1462, adopted May 25, 2021, and the permit-exemption list was added by Ordinance 20-1432, adopted February 11, 2020.