That’s entirely dependent on the region. In Chicago, two-floor apartments are routinely referred to as duplex. In Cleveland, a duplex is a house with two dwelli

That’s entirely dependent on the region. In Chicago, two-floor apartments are routinely referred to as duplex. In Cleveland, a duplex is a house with two dwellings, too and bottom. If the house is split side-by-side, it’s a double. There are other places where these two terms are reversed.