Window technology has changed dramatically in the last 20 years. Great Lakes^® Window has consistently led the industry with advancements that have made windows more efficient, more beautiful and more affordable. Innovations reflected in every GrandView™ 4000 product.

Our technology delivers windows that are maintenance free and leak free, with quality checks every step along the way so that our products remain trouble free. Quality that has been tested and certified by independent industry organizations including the Window & Door Manufacturers Association and the National Fenestration Rating Council. Not to mention that our units with optional multilayer, vacuum-deposition, soft-coat Low-E glass have earned the ENERGY STAR^® for meeting the strict energy efficiency guidlines set by the EPA and U.S. Department of Energy.