A shed permit generally regulates the construction or installation of a detached accessory structure used for storage, gardening equipment, tools, or similar non-habitable purposes. Whether a building permit is required often depends on the shed’s floor or roof area, height, foundation, location, and intended use. Small sheds may qualify for an exemption, but there is no nationwide size threshold.
Local exemption rules illustrate how widely requirements differ. Seattle allows certain detached, single-story sheds with a roof area of 120 square feet or less without a construction permit when additional conditions are met. Austin exempts qualifying one-story detached accessory structures up to 200 square feet and 15 feet high when they contain no plumbing and are outside flood hazard areas. Minneapolis also exempts certain one-story tool and storage sheds under 200 square feet. Portland generally requires a building permit when a non-habitable accessory structure exceeds 200 square feet or 15 feet in height.
A building-permit exemption does not necessarily eliminate zoning review. Setbacks from property lines, maximum height, lot coverage, rear- or side-yard placement, easements, and accessory-structure rules can still apply. Charlotte demonstrates this distinction clearly: smaller accessory structures can require a City Zoning Use Permit even when Mecklenburg County does not require a building permit. Philadelphia similarly has separate building and zoning exemptions with different criteria.
Foundation type and utilities can change the permit path. Electrical wiring, plumbing, heating, or other building systems may require separate trade permits even when the shed itself is exempt from a structural permit. Flood zones, environmentally sensitive areas, steep slopes, historic districts, and larger or unusual structures can also trigger additional review. When a building permit is required, plans may need to show the site location, dimensions, framing, foundation, and other structural details, followed by applicable inspections.
Select a city-specific shed permit guide to confirm local size and height exemptions, zoning setbacks, foundation rules, required plans, trade permits, inspections, and special site restrictions.