Classification for contractors specializing in design, construction, and renovation of animal testing facilities in pharmaceutical, chemical, and food manufacturing industries. Includes design and construction of GLP-compliant laboratory animal housing rooms, clean rooms, HVAC systems, water supply and drainage facilities, and waste treatment systems. Covers specialized construction services such as biosafety level compliant facilities, SPF animal breeding environments, laboratory layout design, animal transport systems, and infection prevention equipment. Supports facility development necessary for new drug development and safety testing in manufacturing industry R&D departments.