This discussion provides deep insights into the processes and procedures for factory construction in industrial zones (IZs) in Vietnam, with special focus on legal changes from 2025. The document emphasizes the importance of obtaining construction permits, developing detailed factory plans (including building density and setbacks), ensuring adequate infrastructure (electricity, water, wastewater treatment), and complying with fire safety and environmental impact assessment regulations. The main purpose is to help foreign investors better understand Vietnam's legal and business environment