Must "red walls and green tiles" be palaces?

Ancient architecture in China has a strict hierarchy, which is distinguished by color and architectural form. For example, yellow glazed tiles can only be used by the royal family, and the Hall of Supreme Harmony in the Forbidden City has the only roof form in China. As for the blue tile, it is not royal, but ordinary people can never use it. Ordinary people can only use black tiles. There seems to be no limit to red walls, but red walls and black tiles are generally ugly, right? So there are hardly any, I haven't seen them anyway, hehe ~