We gutted our old shower & also removed the door jab of the old shower entrance to open it up. It was professionally re-tiled. We contracted Leo to install the custom glass partition and door. He performed the installation expertly. Even when I was advised by others that you could not drill into porcelain tile, Leo did it without any difficulty. He was able to complete the install despite that the handle side wall was skewed by about a 1/4 inch. He is an expert at caulking and was able to make up the differences in the gaps and it was not noticeable.