Accurate Dorwin Company has been making the finest quality and highest energy efficient rated (ER) windows since 1952. We continue to lead the industry because we use the latest technology to meet the challenges of building high performance windows and doors. We don’t cut corners on our products, we build in the quality customers want for renovations, retrofits or new construction. This ability to build superior products that keep pace with the changing times helps to create the Accurate Dorwin difference. We call it the “Fibreglass Advantage”, and it can be your advantage too!