If a window replacement contractor is willing to show you examples of their past installations, it means they probably take pride in what they do, and feel confident enough in their work to show it to potential clients. Seeing a contractor’s previous work will also help you decide if you want a similar finished product. If their prior installations don’t appeal to you at all, then you know it’s time to move on. Many reputable contractors will ask past clients if it’s okay to give potential customers their address, so they can drive by and see the contractor’s work in person. If you’re able to speak to one of the contractor’s clients, learning about their experience with the company can be incredibly helpful. Make sure to ask them if they had any problems with the window replacement contractor, and if they would work with them again in the future.