Duncan's Window & Door LLC

Duncan’s Window & Door LLC is a family-owned window and door replacement company based in Oshkosh, Wisconsin, serving homeowners within a 90-mile radius, including Appleton, Neenah, Menasha, Fond du Lac, Green Bay, Omro, Winneconne, and surrounding areas. We specialize in energy-efficient window and door replacement, including double-pane and triple-pane windows, full-frame installations, custom window sizing, patio door replacement, and entry door replacement. All windows and doors are purchased factory direct and installed by our own in-house employees—never subcontractors. Because we supply and install our products, our warranty is clear and straightforward. If service is ever needed, it starts and ends with us.