Incorporated in 1921, Penn Sheet Metal was originally part of Pennsylvania Supply & Mfg Co., founded by the Kuhns brothers, Charles and George, who fabricated and installed metal cornices and roofing. Despite the Great Depression, which hit in 1929, the business continued to grow. By the 1940s, two distinct businesses had emerged – the sheet metal shop and a supply warehouse.

In 1989, Pennsylvania Supply sold the sheet metal shop (Penn Sheet Metal) to a long-time customer, who in turn sold the company in 2003 to the current owners.