This study aims to determine the most essential standards of integrity that must be available in the design and implementation of sustainable schools in Iraq. This study was prepared by conducting a questionnaire that included several specialists and experts in the field of building school buildings in Iraq. The results were analyzed, and the relative importance index was used to compare them. The analysis of sustainability criteria for school design underscores the pivotal role of the 'Sustainable Site' (SS) factor. This element encompasses a wide range of considerations aimed at reducing the environmental impact of the school's location and maximizing the site's potential. Following this is indoor environmental quality (IEQ), the second most crucial factor in sustainable school design. This standard focuses on the conditions within the school building that influence the students' and staff's health, comfort, and productivity. Waste management emerges as the third most crucial standard in sustainable school design. Effective waste management practices are vital for reducing the environmental footprint of educational institutions. Following this is Material and Resource Efficiency, the fourth necessary standard. This criterion underscores the need for conscientious utilization of materials and resources throughout the school building's lifespan, including construction, operation, and maintenance. Energy efficiency is the fifth standard. This standard focuses on reducing the school building's overall energy consumption and utilizing renewable energy sources to minimize environmental impact. Finally, Water conservation is also a critical factor. This standard involves using water-efficient fixtures and rainwater harvesting systems. Efficient water management conserves this precious resource and reduces utility costs.