Before selecting a replacement, document why the existing door is no longer working for the property. That separates a genuine whole-door project from a repair decision and helps identify what the new door should improve.
Sections
Look at the extent of dents, cracking, separation, rust or other deterioration across the complete door rather than one visible blemish.
Hardware
Springs, cables, rollers, tracks and hinges should be considered separately so one hardware problem is not mistaken for proof that every section needs replacement.
Repair history
Note whether recent work has been isolated or whether several substantial issues are starting to overlap.
Weather sealing
Check bottom and perimeter gaps, but keep broader runoff or drainage problems separate from the garage-door replacement decision.
Garage use
Consider whether the garage is mainly vehicle storage, attached to living space, used as a workshop, or has other comfort and noise priorities.
Exterior design
Decide whether the goal is to preserve the existing appearance or use replacement as an opportunity to change panel design, windows, colour or finish.