Artificial Intelligence, if applied to architecture, opens completely new horizons in designing, planning, and realization. AI can substantially speed up and facilitate the process of elaboration of architectural projects with high accuracy and cost optimization. On the other hand, the integration of AI into architectural practice brings about a number of legal issues that need attention and adaptation to the existing legislative and regulatory frameworks. The use of AI in architectural projects allows one to get, in a very short time, the design concept based on set parameters and preferences of the client. AI is able to analyse vast amounts of data about the functionality of the buildings, helping to reach the most efficient planning solutions. It is used in the simulation of the behaviour of buildings in various environments, allowing preliminary assessment of sustainability, energy efficiency, and other key parameters. AI can design intelligent buildings integrated with building management systems to enable better resource usage and provide improved living conditions for the occupants. There is an urgent need to question issues like intellectual property in using AI in architecture, originality of design, and who is the author and software developed using AI. Designs developed using AI must comply with all the relevant building and architectural codes and standards. Ethical considerations in using AI relate to both privacy and accessibility issues in architectural solutions. Artificial Intelligence can radically change architectural practice by providing new tools for designing and managing buildings. In any case, the full and effective use of AI in architecture requires the development and implementation of particular legal frameworks governing intellectual property, liability, compliance, and ethical standards. Only well-considered legal regulation will maximize the benefits of AI in architecture: safety, innovation, and sustainability.