Wear parts. Cheap on their own, and often bundled with a spring job.
Cable is frayed, snapped, or has come off the drum
Cables are usually replaced in pairs and often fail alongside a spring, since a spring break shock-loads them.
0.75–1.5 hrs on site · Scales with door size
Grinding or squealing, door drags in the track
Nylon rollers cost more than steel and run markedly quieter — the usual upgrade if noise is the complaint.
0.75–1.25 hrs on site · Scales with door size
Door is crooked, jammed, or hanging out of the rails
Price depends on what knocked it off. A roller that jumped is quick; a door hit by a vehicle usually means bent track and damaged panels too.
1–2 hrs on site · Scales with door size
Track is visibly bent, dented, or pulling off the wall
Minor bends can be straightened. Once a track is kinked at a curve, it gets replaced — a straightened curve will keep throwing the door.
1–2 hrs on site · Scales with door size
Creaking at the joints, or visible cracks around a hinge
Bottom brackets are under full spring tension and are not a DIY item — they are the single most dangerous part on the door.
0.5–1.25 hrs on site · Scales with door size
Daylight, water, or draft under or around the closed door
Cheap job with a real payback on an attached or heated garage. If the concrete has settled unevenly, the seal alone may not close the gap.
0.5–1.25 hrs on site · Scales with door size