Centennial Windows & Doors is the best! I have dealt with this company twice in the past when I lived in Kitchener and I was so impressed that I didn't even call around for the prerequisite three quotes since moving here to London. In this day and age, I find so many businesses do not call back or show up as promised, but Centennial Windows & Doors does. Today they finished up a day and a half install, replacing all my windows and my patio door. The experience was a delight from start to finish! The sales rep, Sean was very knowledgeable and friendly. The lady doing the install booking (sorry, I didn't catch her name) was courteous and helpful. Last but not least, the installers, Doug and Paco were superb! Their level of efficacy and quality of workmanship would rival my late husband, Chuck, who was a perfectionist.