Most container sides are constructed from corrugated material, with the corrugation typically extending to a depth of 1 inch (25 mm). This results in a reduction of the external width by 2 inches (50 mm)—1 inch on each side. The doors, which are about 2 inches (50 mm) thick and have a corrugated back panel, reduce the internal length by approximately 3 inches (75 mm). The most significant reduction in dimensions from external to internal is observed in height. A standard container floor is about 27 mm (1.1 inches) thick, with an under-floor clearance of approximately 6 inches (150 mm).

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During the corrugation process, an additional 1 inch (25 mm) is lost, leading to an internal dimension that is roughly 8 inches smaller than the external measurement, resulting in an internal width of about 7 feet 10 inches (2.39 meters). However, these dimensions can vary depending on the floor thickness and construction techniques used. The steel top rail, a structural component of the container, further reduces the door height. Typically measuring 4 inches (100 mm), this brings the entrance height down to 7 feet 6 inches (2.28 meters), though variations can occur.

Please note that the above measurements are provided as a general guide to the sizes of different shipping and storage containers. Actual container sizes may vary from unit to unit, particularly with cut-down containers, where the construction method can impact both size and weight. These measurements do not apply to Container House units.