In Leonia the practical answer is a fabricator, not a reseller. A shop that cuts its own glass can size panels to walls that lean and revise a cut list once it has seen the room. Accurate Glass & Mirror cuts, edges and machines every panel at its Lodi shop, about 14 minutes from town, and installs with its own crew.
Ask three questions and the answer sorts itself out. Who cuts the glass, and in what building. Who does the measure, and are they the same people who install. What happens if the opening turns out to be an inch off the plan. A fabricator answers those without hedging, because the bench, the tape and the truck all belong to the same company. A reseller has to make a phone call.
It shows up in the schedule and in the outcome. A shop that owns the cutting table can adjust a panel while the job is still open. A middleman ships the problem upstream and waits for an answer.
Bathroom walls are rarely plumb, and tile makes it worse by adding thickness unevenly. Say a wall leans out three eighths of an inch over seven feet. A rectangular panel set against it will either sit tight at the bottom with a gap at the top, or the reverse. There are three usual moves: cut the panel with a slight taper so it follows the wall, set it in a channel that hides the discrepancy, or seal the joint. Which one is right depends on how much lean there is and how the room reads.
None of those calls can be made from a catalog width, and none of them are available on a panel that was tempered before anyone looked at your bathroom.
Renovated bathrooms in older houses hide a lot behind the finish. Sometimes there is solid blocking exactly where a hinge wants to go, sometimes there is a stud bay and air. Sometimes the curb is a mortar bed pitched the wrong way. We look for all of it at the measure and design the hardware around what is really there, rather than opening finished tile on install day to find out. That is the advantage of measuring, fabricating and installing under one roof: the discovery and the fix belong to the same people.
Yes, within reason. A slight taper on the wall edge of a panel is standard practice when a wall leans, and it is invisible once installed. Larger deviations get handled with a channel or a filler instead, because a panel tapered too far starts to look wrong against the tile line. The measure tells us which.
Usually not. Hinges and clips are drilled through tile into whatever backing sits behind it, using bits made for that job. Removing tile only comes up when there is nothing solid to fasten into and the layout cannot shift to a spot that has backing. We check for that before quoting, not on install day.
Leonia is roughly 14 minutes from the Lodi shop that would cut, edge and machine your panels. Ask for a free measure on (201) 460-1313, and the walls get read properly before a single dimension goes to the saw.