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A split-level home (also called a tri-level home) is a style of house in which the floor levels are staggered, so that the "main" level of the house (e.g. the level that usually contains the front entry), is partway between the upper and lower floors. The main level typically contains common living areas (a living room, kitchen, dining room, and/or family room). There are typically two short sets of stairs, one running upward to a bedroom level, and one going downward toward a basement area. The basement level is usually finished off, and often contains additional living areas (most often, a family room, an office and/or a hobby or playroom), as well as frequently laundry facilities and other utilities. The basement level often also features a garage, and is usually level with the driveway. Beneath the main level (downward from the basement level) is usually crawl space, or sometimes additional basement space, which is frequently unfinished.
A sidesplit is where the split level is visible from the front elevation of the home.
A backsplit is where the split level is only visible from the side elevation. The front elevations shows only a single story and the two stories are in the back. A bi-level includes two short sets of stairs and two levels. The entry is between floors. The front door opens to a landing. One short flight of stairs leads up to the top floor; another short flight of stairs leads down. The top floor tends to be full height ceilings with the living room, dining room, kitchen, bedrooms and bathrooms. The lower floor often has lower ceilings and is partially below ground. However, in many modern split foyer homes, the lower level is at grade, which necessitates an outdoor staircase to reach the front door. These homes often also have very high ceilings on the lower level to accommodate the home's HVAC ducting.
The stacked split level has four or five short sets of stairs, and five or six levels. The entry is on a middle floor between two levels. The front door opens into a foyer, and two short sets of stairs typically lead down to a basement and up to some sort of living area (often the kitchen or the living room). is on top of the foyer (containing either the kitchen or the living room), and another short set of stairs typically leads to at least one bedroom, located on top of the first living area. Often additional bedrooms are 'stacked' on top of the second living area, hence the name 'stacked split level'. This type of construction is typically used for townhouses.
The split level has two or three short sets of stairs, and three or four levels. The entry is on a middle floor between two floors. The front door opens directly into what is usually the formal living area or which are typically partially below ground. Below that may be a small crawl space. Sometimes a short flight above the bedroom floor is another single bedroom. Above that is typically an attic accessed by either another flight of stairs or an opening placed high in a closet. The architect behind the design of a split level was a graduate of University of Miami named John Lanterman. With his strides in design many other types of split level homes have been created.
A split level is definitely less than 15 feet from the window to the ground.
The split entry has two short sets of stairs (usually 5 or 6 steps per stairway) and is a one level improvement with a basement. The entry is "between" the floors. Per FNMA/FHLMC regulations the lower level is defined as a basement even if finished. Usually the basement level is "walk out". A split entry has a different look than a raised ranch from the outside as the front entry door lines up to the front windows differently. A variation of the split entry is called the "front to back split" in which there are two upper levels.
The raised ranch includes a basement on the bottom and a "full set of stairs" (a full flight of stairs, usually 12 or 13) which leads to the 1st level. A raised ranch has a different look on the front than a split-entry, as the front door lines up to the front windows differently. The front door entry is predominately at the lower floor. The top floor per FNMA/FHLMC is the living area and the lower floor is the basement, even if finished.
In some regions such as the Northeastern United States, the term "split level" is used to refer to a bi-level house with a split entry. This style of house is also known as a "split foyer." This is a two-story house that has a small entrance foyer with stairs that "split"—part of a flight of stairs go up (usually to the living room, kitchen, and bedrooms) and part of a flight of stairs go down (usually to a family room and garage/storage area). This style is very popular in other areas of the country as well.
The style gained popularity in North America during the mid-20th century, as the suburbs expanded, beginning in the years after World War II, and has remained a popular housing style from the 1950s onward.