The pharmaceutical industry necessitates strict regulation of manufacturing environments for Active Pharmaceutical Ingredients (APIs) to guarantee product stability and adherence to regulatory standards. This thesis examines the optimization and design of API pharma rooms with a focus on improving product stability and ensuring compliance with regulatory standards. The study begins by introducing the essential role of controlled environments in API production. It then provides a thorough examination of global regulatory standards and their implications for pharmaceutical manufacturing facilities. Key environmental parameters impacting API stability, such as temperature, humidity, air quality, and light exposure, are thoroughly investigated. Advanced HVAC systems, air filtration, and real-time monitoring technologies essential for maintaining optimal conditions are examined. The analysis extends to architectural and structural factors, including cleanroom classifications, building materials, and surface finishes, to ensure contamination control and facilitate maintenance. Case studies demonstrate the positive impact of precise environmental control on product stability. The study also explores risk assessment approaches, contingency planning, and the integration of automation technologies to enhance reliability and compliance. This thesis presents effective strategies and insights for optimizing API pharma rooms, aiming to guide future research and development in this crucial area, ultimately contributing to higher product stability, regulatory adherence, and operational excellence in the pharmaceutical sector.