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

Section 9-1-35.3 defines an "accessory structure" as any building subordinate and incidental to the main house on the same lot, expressly naming patio covers, gazebos, trellises, arbors, decks, storage sheds and greenhouses, and it applies to any accessory structure over 6 feet high or any patio or deck over 18 inches above finish grade. Location comes first: accessory structures generally have to sit on the rear 50 percent of the building site, with only minor unenclosed items like arbors and trellises allowed forward of that line.

An unenclosed structure, such as an open-sided shed or gazebo, needs at least 3 feet of clearance from any property line that does not border a street, while an enclosed structure, such as a fully walled storage shed, needs at least 5 feet from that same property line, and either type needs 10 feet from a property line that does border a street. Height then depends on setback compliance: an unenclosed accessory structure that meets the main building's own setback can rise to 15 feet, but drops to a 12-foot cap if it encroaches into that setback instead.

An enclosed structure like a garden shed is capped lower still, at 10 feet in height and 150 square feet of floor area regardless of where on the rear half of the lot it sits. Modifications to these height, size or location standards require an approved minor adjustment under Section 9-1-114, supported by findings that the change will not look unsightly or block views of street traffic.