In architecture, a porch or walkway with a roof ? either open or partly enclosed ? supported by columns and often with a pediment, usually leading to the entrance of a building. It has been a standard feature of classical and neoclassical styles. Porticos can be one or more stories high, and may be as narrow as a door or as wide as an entire building. Porticos an galleries are often confused, and some can be described as being both. The plural form can be either porticoes or porticos. Each can have a colonnade, and each can be a long porch.