This 1- or 1 1/2-story structure (usually with a gable roof) is similar to the incised-porch bungalow except that the porch is added-on and not built-in. Eaves of the low- to moderately-pitched roof are extended outward on all sides. Dormers, front and back, are common, providing additional space in the half-story. Floor plans vary as do chimney arrangements. Generally, rooms have access to one another without the use of large hallways: the front door commonly opening into the living room. Bungalows, promoted by commercial builders, reached their height of popularity just prior to World War I. Finley and Scott 1940, 414; Lancaster 1958, 239; Mattson 1981, 75.