Safety: Garage doors are heavy and spring/cable systems can be under significant tension. Do not loosen or disassemble high-tension hardware unless you are qualified to do so.
The Symptom Is Not Always the Diagnosis
A door that will not open could involve a spring, opener, cable, track, control, or power issue, and those repairs can differ substantially.
Parts and Door Configuration Matter
Door size, spring system, opener type, hardware design, and parts availability can affect the work required.
Get Scope Before Comparing Prices
The most useful price comparison is based on the same diagnosed problem and repair scope rather than a generic advertised number.