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Founded in 1971, Kensington produced its first aluminum windows in a small factory in New Kensington, Pennsylvania. Anticipating an industry demand for new, modern, energy efficient, and maintenance free materials, the company shifted its focus to vinyl later in the decade. The 1980's brought about a growing acceptance of vinyl building materials in many residential areas of the country and Kensington continued to develop revolutionary products to meet the demand. Through growth, expansion, and reinvestment in new technologies, today Kensington is one of the premiere window manufacturers in the country. In fact, combined with its sister companies, Kensington is one of the top ten vinyl window producers in the U.S. and one of the top ten producers of vinyl building materials.