Family owned Larson Manufacturing has grown from a one-man shop into the largest manufacturer of storm doors and storm windows in the United States. Our factories and our Customer Care call center are and have always been, based in America, with manufacturing plants in Brookings, SD; Lake Mills, IA; and Mocksville, NC. At LARSON, we put people first. We’re devoted to our employees and their families, our customers, and our communities. Larson Manufacturing was founded with a strong commitment to quality, integrity, and service. These principles are the foundation of our company and living these core values is as essential to our success today as it was in the beginning.