Question: what is a standard size exterior door?
Answer: What's the standard width of a front door? The standard—and the most common—width of a single front door is 762mm, though they can range from a narrow 400 mm (1 ft 3 in) to a very wide 1,524 mm (5 ft). Origin's Front Door is available in widths ranging from 400 mm to 1,130 mm (3 ft 8½ in).