The main room of a studio apartment in Minneapolis, USA. The sofabed is to the right and a small alcove is partially seen to the left; not shown are the small kitchen and bathroom.
A studio apartment, also known as a studio flat (UK), efficiency apartment or bachelor apartment, is a small apartment which combines living room, bedroom, and kitchenette into a single room. "Bachelor" or "efficiency" apartments are sometimes smaller than studio apartments.
These kinds of apartments typically consist of one large room which serves as the living, dining, and bedroom. Kitchen facilities may either be located in the central room, or in a small separate room, and the bathroom is usually in its own smaller room.
Studio, efficiency, and bachelor style apartments all tend to be the smallest apartments with the lowest rents in a given area, usually ranging around 300 to 450 square feet (25–45 square metres) in the United States, but considerably smaller in countries such as Japan, South Korea, and several European capitals.
In British usage, a studio flat has its own bathroom; a single room with cooking facilities. On the other hand, if a dwelling has a shared bathroom, it is known as a bedsit.
A variation common in New York City is the "L-shaped" or "alcove" studio, in which the central room branches off into a small alcove that can be used for sleeping or dining.
Bachelor apartment, or simply "bachelor," is the common term in English Canada for any single room dwelling unit which is not a shared accommodation. A shared room, or particularly small bachelor, is sometimes referred to as a "bachelorette."
Japan has an even smaller variation of the studio apartment known as the one room mansion.
Known as studio rooms in New Zealand, they frequently feature a bedroom with study area and an en-suite bathroom. Spaces such as kitchen, lounge and dining area are communal between other people staying in that apartment.
Studio apartments in Norway are called "1-romsleilighet", ”one-room-apartment" in English, because they count both the living room and the bedrooms. Hence an apartment with one bedroom is called a "two-room-apartment" (2-romsleilighet).
Studio apartments in generally are called One room kitchen apartment featuring a hall cum bedroom, including a bathroom and attached kitchenette to the hall mostly availed by one or more Bachelor or a small family ranging around 200 to maximum up to 450 square feet (equivalent to approximately 15 – 40 square metres).