Shed permit rules in Coconino County, AZ — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Coconino County exempts a detached accessory structure of 200 square feet or less from a building permit, but it must still meet zoning setbacks. Larger sheds need permits and roofs engineered for the local snow load.
Under the 2018 IRC as adopted by Coconino County, a one-story detached accessory building of 200 square feet or less does not need a building permit, and the county publishes a handout for these small structures. The exemption is only from the permit, not from zoning: the shed must meet accessory-structure setbacks and stay out of easements. Anything larger needs a permit, and at elevation the roof must be engineered for the area's ground snow load, which runs around 50 pounds per square foot near Flagstaff and higher on the peaks. Footings must reach the 30-inch frost depth used across most of the county. Running power or water to a shed triggers separate permits.
A shed over 200 square feet, or any shed with utilities, built without a permit draws a stop-work order and retroactive fees. A shed in a required setback or easement must be moved.
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