Description Modtech Holdings adds a little class to school districts. A leading maker of permanent and portable buildings, Modtech primarily designs, manufacturers, and installs modular classrooms and other education facilities, such as libraries, multipurpose rooms, science labs, and concrete block restrooms. It also serves the commercial market (office, retail, and administrative spaces); the residential sector (apartments, condos, and town homes); government agencies (military buildings, justice centers, police departments, and fire stations); and the health care industry (doctor's offices, fitness centers, rural medical clinics, urgent care centers, and diagnostic buildings).