Yes, a dishwasher is generally considered a plumbing fixture. Plumbing fixtures are devices or appliances connected to a building's plumbing system that facilitate the use of water for various purposes. They include items like sinks, toilets, bathtubs, showers, and dishwashers.
A dishwasher is specifically designed to wash dishes automatically, using water and detergent, making it an essential plumbing fixture in modern kitchens. It is usually connected to the hot water supply and the drain system of the building, allowing it to efficiently clean and rinse dishes without manual effort.
Since dishwashers require water supply and drainage connections, they are classified as plumbing fixtures within the context of residential and commercial buildings.