Wincore Windows adds capacity in Georgia Plastics News Report Wincore Windoow Co. LLC Wincore Window Co. LLC plans to more than double the size of its plant in Swainsboro, Ga., to meet a sharp increase in demand from the home remodeling and building. Parkersburg, W. Va. — Twenty months after opening a 75,000-square-foot manufacturing plant in Swainsboro, Ga., Wincore Window Co. LLC plans to more than double in size in the city to meet a sharp increase in demand from the home remodeling and building markets. The Parkersburg-based company will invest $5 million into a 100,000-square-foot facility adjacent to its current site and hire another 100 people, bringing its total to 271 employees and bumping it up to be the fourth largest employer in Emanuel County.