Centennial Glass did a fantastic job installing a dog door (ordered separately) into my sliding glass patio door. They were very quick in responding to our questions about whether such a service could be provided and they gave us a solid quote with all the expenses broken down. It wasn't cheap, but the job that they did was well worth it and much simpler than a competitor company that we also had in for an estimate.
We had two site visits from Centennial, the first to remove our door so they could replace the glass and put in the glass with the dog door, and then the second appointment a few days later to install it.
The staff that came out to our home both times were incredibly professional. Our glass door was difficult to remove due to the unusual frame but they didn't give up, and called in a more experienced veteran who showed up right away to try and figure out the problem.
Replacing the glass door was much simpler, but I appreciated that the staff stuck around afterward to try and help figure out how I could replace the lock keeper that I had misplaced. Ended up finding it shortly afterward but it was very nice of them to help out even after they had completed their part of the work.
The door itself works fantastic, they did a great job and we're very happy with the finished product.