Useful Documents



For as long as you live in your home, we back every window and patio door from Great Lakes® Window with our Limited Lifetime Warranty*. Our door and window warranty covers everything – from the frame, sash, glass seal failure, to hardware, screens and more. And should you ever decide to move away, your warranty is completely transferable to the next homeowner. No questions asked.



Comfort Smart Warranty
Harbor Light Warranty



Replacement Window Care & Maintenance Guide