It is a house divided into two living units or residences, usually having separate entrances. It also can be an apartment building or condominium, usually impossible to differentiate from a normal house on the exterior. Duplex can also refer to three unit buildings, known as a triplex and four unit buildings, known as a quadruplex, that usually refer to movie theatres.

Therefore, the line between an apartment building and a duplex is somewhat blurred, with apartment buildings tending to be larger, while duplexes are usually the size of a normal house. Duplexes are particularly common in the Northeastern United States.

If you are interested in a Duplex Plan you may also be interested in other Multi Family Housing options. The following options may also be referred to as Condo, Row House, Townhouse, Multiplex and Multi Family Housing.

• 3 Unit Muiltiplexes
• 4 Unit Quadplexes
• 5 Unit Townhouse Plans
• 6 Unit Multi-Plex House Plans
• 8 Unit Condo's
• 12 Unit Multi Family Home Plans