?Larson Manufacturing was founded with a strong commitment to quality, integrity, and service. These principles are the foundation of their company and living these core values is as essential to their success today as it was in the beginning. More than 60 years ago, Oscar Larson founded thei company through his entrepreneurial mindset and desire to produce a better product. 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.