A visible gap or drop at one corner of the door, while the other side looks fine, almost always comes down to one worn roller doing all the work. Here's how to spot it and fix it.
Look at the top corners of the door frame from across the room. If one corner sits noticeably lower or the gap is uneven side to side, it's a one-sided roller issue.
We replace the worn roller and adjust both sides to match, restoring a flush, even fit without needing to touch the panel itself in most cases.
A drop at one specific corner, while the rest of the door looks fine, points to one worn roller rather than a general wear issue.
Don't ignore a one-corner sag assuming it'll even out, it typically means one roller is failing faster than the other.
Continued use with an uneven panel accelerates wear on the good-side roller too, eventually making it a two-roller repair.
Cost: $180-$300 for the affected roller and adjustment.
Time: 45-60 minutes typically.
Repair, targeting the specific worn roller causing the sag.
Uneven wear is common when one side of a door gets more direct sun or moisture exposure than the other.
Look at the top corners of the frame from across the room, an uneven gap side to side is the sign.
Sometimes temporarily, but if the roller is actually worn, replacement is the longer-lasting fix.
Get a free quote, most one-sided roller fixes are done same-day.