A SEMI is a type of house that is typically a single-family dwelling with one-half of the structure attached to another dwelling. A frat house is a type of house that is owned by a fraternity or sorority and is used as a residence for members. A VILLA is a type of house that is usually a large, luxurious residence. A penthouse is a type of house that is located on the top floor of a building and is usually more expensive than other apartments in the building. A roadhouse is a type of house that is typically a large, rural dwelling. A SAFE house is a type of house that is designed to provide protection from danger or harm. A tree house is a type of house that is built in the branches of a tree and is often used as a play area for children. A prefab is a type of house that is constructed off-site and then transported to its final location for assembly.