屋子 (wū zi) is a colloquial, everyday noun meaning 'house' or 'home'—referring to a building where people live. While 屋 (wū) alone means 'room' or 'building', adding the diminutive suffix 子 (zi) softens it and makes it sound more familiar and informal, like saying 'place to live' rather than a formal architectural term. It’s commonly used in spoken Mandarin when talking about one’s residence, rental apartments, or simple dwellings—not for grand mansions or official buildings.

This word carries a warm, down-to-earth connotation, often implying comfort, familiarity, or personal space. You’ll hear it in casual conversation ('My house is small but cozy'), not in legal documents or real estate listings (where 房子 or 住宅 would be preferred). It can refer to the entire dwelling or sometimes just a single room, depending on context—but always with an intimate, homely feel.