In this technical paper, Pete Makowenskyj, Sr. Director of Design Consulting at G-CON, explains how cleanroom facilities handling hazardous materials must balance patient safety, product sterility, and operator protection. The paper outlines the regulatory landscape, highlighting gaps between contamination-control guidance and containment requirements for high-risk agents such as ADCs, radiopharmaceuticals, and spore-forming organisms. It details key design considerations—including pressure schemes, HVAC zoning, filtration, and decontamination strategies—that ensure safe, compliant operations. The paper also emphasizes the value of prefabricated cleanroom solutions for achieving tighter environments, flexibility, and future-proofing.