A mezzanine is a space that is usually located on the upper floors of houses or buildings, has a low ceiling and is reached by stairs. Mezzanines are made to provide more living space or to use for storage purposes. The height of the mezzanine floors varies according to the architecture of the building and its intended use. Some mezzanines are open to the downstairs room, while others are closed and designed as a separate room. The advantages of mezzanines include more light, good ventilation and space savings. The disadvantages of mezzanine floors are that the ceiling is low, the staircase is not safe and the insulation is insufficient.