Walls which meet a door or glass panel need to be completely vertical, or "plumb", in order to prevent gaps, uneven joints, and hinge "bind". This means the wall can't lean in any direction, or be "bowed" or "bellied". Any walls that are more than 1/4" out of plumb make it very difficult to install a shower properly because they cause unsightly gaps, are more likely to leak, and have a greater likelihood of hinge bind. We can work with walls that are less than 1/4" out of plumb.
When one of our technicians comes out measure your bathroom shower, he'll use a six-foot level to test your bathroom walls and floor (and ceiling for airtight enclosures).
About 75 percent of the homes we work in do not have perfectly straight walls, so this is a common problem that we're very good at handling. For less than 1/4" out of plumb walls, we will cut the glass so it will lie flush against your wall.