A penthouse or penthouse apartment is an apartment which is located in the highest floor of an apartment building. The luxury features of penthouses are the distinctive features of these kinds of houses. Originally the houses were built on the roof separately. Some features which set them apart from normal apartments include high ceilings, private elevators, more area, multiple owner suites, over sized windows, terraces, fireplaces and many more such features. All these features make penthouses the seat of luxury living for individuals. The penthouse occupants usually have a great view of the city skyline in most cities of the world. This is because of the location of the apartments.
These kind of apartments despite been located in busy cities give the feeling of living aloof to the individuals. In many penthouses in the United Kingdom there is a private staircase leading to the roof of the penthouse. This is a personal roof for use by the owner of the penthouse apart from the terrace. Terms like sub-penthouse or lower penthouse have been coined for those apartments which are just below the uppermost apartments in the building where the individual is living.