Cornerstone Windows & Doors (Tony Szik, the owner) is very professional. I really appreciate how courteous and efficient he was with the repair of a window. He is licensed, was on time, very efficient and did a great job! We’ve been hiring Cornerstone to do work on our house over the last ten years and we couldn’t be happier! They are trustworthy!

Since they only just finished the job, I cannot comment on the quality of windows we purchased from Cornerstone, OR any warranty-related issues. What I CAN say is that their staff is professional and a pleasure to work with. The installation was on time and ALL their installers as polite as they were professional. Because we were so happy with dealing with Cornerstone, we cannot comment on value because we didnt bother getting prices from anyone else.

Tony and his crew did an awesome job on our home! Had all 13 windows and 3 sliders replaced and couldn’t be happier. I would definitely recommend them for any job big or small!!!

Very professional company, and workmanship outstanding. Would recommend to my friends for repairs and or replacement of windows and doors.

Rockler