Shed permit rules in Tustin, CA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
In Tustin's R-1 single-family district, detached accessory buildings such as sheds are governed by zoning standards in City Code Section 9223, which allow a maximum height of 25 feet with minimum 1-foot side and rear setbacks (5 feet on an alley). A building permit is generally required once a shed exceeds the California 120-square-foot exemption.
Tustin regulates detached accessory buildings, including storage sheds, through the R-1 Single-Family Residential District standards in Tustin City Code Section 9223. Reported standards set a maximum accessory-building height of 25 feet, a minimum side-yard setback of 1 foot, and a minimum rear-yard setback of 1 foot, increasing to 5 feet where the lot abuts an alley. Accessory buildings may cover up to 30 percent of the rear yard, and an accessory structure must be built simultaneously with or after the main dwelling. Separately, under the California Building Code (Section 105.2, adopted statewide), a one-story detached accessory structure used as a tool or storage shed is exempt from a building permit when its floor area does not exceed 120 square feet; larger sheds, or any shed with electrical, plumbing, or mechanical work, require a permit. Zoning setbacks apply to all sheds regardless of size. A shed in Old Town's Cultural Resources District is additionally subject to Design Review and a Certificate of Appropriateness so that its scale, materials, and roof form are compatible with the historic residence. Verify dimensions and permit thresholds with the Tustin Building Division at (714) 573-3130 before construction, since exact figures are set by the current zoning code.
Placing a shed inside a required setback, exceeding height or lot-coverage limits, building a shed over the 120-square-foot permit threshold without a permit, or installing one in the Cultural Resources District without a Certificate of Appropriateness can trigger code enforcement, fines, and removal or relocation orders.
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