A plain house is a simple dwelling that lacks elaborate architectural features or decorative elements. It typically has a straightforward design, with a rectangular or square shape and a basic roof structure. The exterior of a plain house is often unadorned, with minimal ornamentation or embellishments. Inside, the layout is usually functional and practical, with rooms serving their intended purposes without excessive frills. While lacking in extravagant details, a plain house provides a comfortable and functional living space for its occupants.