At Performance Windows we pride ourselves on the quality of our windows and of our service, with each of our installers having installed thousands of Alside windows and working exclusively for Performance. Additionally, each of our installed windows comes with two warranties. The LIFETIME LIMITED WARRANTY covers any damages or changes to the window, it's frame, or to the installation for as long as you live in your home. This is also transferable to any other owner in the case of a sale of your home if the sale occurs within the first ten years of installation.