Johnson County requires a building permit for a carport. It counts as an accessory structure, must meet setbacks and lot coverage, and has to carry Iowa snow and wind loads.
A carport is an accessory structure in unincorporated Johnson County and its cities, so it needs a building permit and must meet the zoning district's setbacks from the property lines, typically several feet at the sides and more at the front. It counts toward the lot's maximum coverage. Because Iowa sees heavy snow and severe wind, the roof must be engineered for local snow and wind loads, and prefabricated metal carport kits still require a permit. An attached carport is reviewed like an addition to the house. Front-yard carports may be limited by the zoning district.
A carport built without a permit draws a stop-work order and retroactive permitting with penalty fees. One inside a required setback may have to be moved or removed.
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See how Johnson County's carport rules rules stack up against other locations.
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