A duplex house is a residential building constructed on two floors. As per the duplex room meaning, it has a single dining room and a single kitchen. It has a common central wall and consists of two living units, either side-by-side or on two floors, with separate entries. While there are two floors, it is sold together and owned by an individual. It may have separate entry points for both floors.

In India, duplexes and semi-duplex houses generally have a kitchen, hall, and bedrooms on the lower floor while the upper floor houses the master bedroom based on the duplex house construction cost. A duplex always has two floors and never three or four floors, in which case it would be called a multiplex. It has a single dining room and a single kitchen.

It has a common central wall and consists of two living units, either side-by-side or on two floors, with separate entries. A mini duplex house is a residential building constructed on two floors. It has a single dining room and a single kitchen.

It has a common central wall and consists of two living units, either side-by-side or on two floors, with separate entries, now when this has a lesser square foot as it is a mini duplex, and when it is shared with two separate individuals it is called semi-duplex, or split duplex.