Venues
While a purpose-built tatami-floored room is considered the ideal venue, any place where the necessary implements for the making and serving of the tea can be set out and where the host can make the tea in the presence of the seated guest(s) can be used as a venue for tea. For instance, a tea gathering can be held picnic-style in the outdoors (this is known as nodate (野点?)).
A purpose-built room designed for the wabi style of tea is called a chashitsu, and is ideally 4.5 tatami in floor area. It has a low ceiling; a hearth built into the floor; shoji screens; an alcove for hanging scrolls and placing other decorative objects; and several entrances for host and guests. It also has an attached preparation area known as a mizuya. A 4.5-mat room is considered standard, but smaller and larger rooms are also used. Building materials and decorations are deliberately simple and rustic in wabi style tea rooms. Chashitsu can also refer to free-standing buildings for tea ceremony. Known in English as tea houses, such structures may contain several tea rooms of different sizes and styles, dressing and waiting rooms, and other amenities, and be surrounded by a tea garden called a roji.
Read more about this topic: Japanese Tea Ceremony