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

160(D) governs any garage, storage shed, or accessory dwelling unit that stands apart from the primary house. 160(D) sets the same standard across the R1-6 through R1-R, R2 through R2-8, and R-3/R-4 zones: a minimum 6-foot separation from the principal structure, a 20-foot front yard setback, a 10-foot street-side setback on corner and reverse corner lots, and interior side and rear setbacks that can drop to zero feet under footnote (b) if the structure is not intended for habitation, meaning its interior is unfinished, like a garage, workshop, or storage shed, and it does not cover more than 40% of the required rear yard.

Any detached garage or carport that opens onto a street still needs a full 20-foot setback regardless of zone. Footnote (e) caps the height of any portion of a detached accessory structure sitting within the side or rear setback area at 10 feet, and footnote (c) bars eaves or overhangs from crossing a property line. Section E adds a citywide ceiling: the total square footage of every attached and detached accessory structure on a lot cannot exceed 50% of the square footage of the principal structure, though one accessory dwelling unit of 800 square feet or less is allowed even if that pushes the total over the cap.

030(E)(1)(d), and interior plumbing in a non-ADU accessory building, like a utility sink or washer hookup, is allowed only if the structure keeps its intended use, such as a garage remaining available for parking.