A sidesplit is a multilevel house configuration where the multiple levels are visible from the front elevation. Typically, the garage is on one side of the house and there is a floor above the garage housing the bedrooms. The other half of the house is the main living area, half a storey above the garage level and half a story below the bedroom level. Grading or steps connect the exterior street to the front door on the main level.

The advantage of sidesplits (and its closely related backsplit) is that it separates bedrooms from living space without the need for a full flight of stairs. It is less land efficient than a full 2 storey house but more efficient than a bungalow.

Sidesplits have a crawlspace that is half the size of the house as the foundation is the same for both halves of the "split" house.