A bonus room is a room created by remodeling or adding an addition that does not meet local building code definitions for traditional rooms. For example, codes will typically require that a bedroom have a closet, a window, and a certain number of electrical outlets. Such a room might actually be intended for sleeping, but will be described as a "bonus room" in rental and sales listings.
The term bonus room is mainly used in the United States. One early use is from The New York Times in 1991, which wrote that "A recent solution to the problem of noisy teen-agers is the enticingly titled bonus room, which is a spare room on the bedroom floor that can be used as a den, television room or guest room."
- A House Is a Home, but It's Something Else, Too. Witold Rybczynski. The New York Times. November 24, 1991
- The Bonus Room: A “Hot Button” in Architectural Design. Rexy Legaspi. 8 October 2015
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