The interior design process is divided into several stages, and at each stage, the design solution must meet technical, functional, ergonomic, aesthetic, and regulatory requirements. Traditionally, achieving these requirements relied on the knowledge and experience of designers and was a labor-intensive, manual process. This article analyzes in detail the main stages of interior design—preparatory, conceptual, sketching, visualization, and working project stages. For each stage, the technical, functional, ergonomic, aesthetic, and regulatory demands are outlined, and how artificial intelligence (AI) can support them is illustrated with real-world examples. Modern tools such as Midjourney, ChatGPT, Planner 5D, ReRoom AI, Autodesk Forma, Coohom, and Twinmotion are examined through the lens of each design stage. The analysis results are summarized in a comparative table, and the ethical and safety aspects of using AI are also discussed. The article concludes with key findings and practical recommendations for professional practice.