Start with what can still be bought for the door. Manufacturers support replacement panels for a model for a limited run of years; past that, a single bent section can force the full door question. Springs, cables, rollers, and openers are universal enough to repair at almost any age. Panels and door structure are where age becomes destiny.
The line in High Point is drawn component by component. A healthy door that has shed one spring is a repair, priced against the published county bracket, and nothing more needs arguing. A door with storm-bent sections, tracks worn out of true, and springs at the end has assembled the replacement case out of its own parts, and this market can price the warranty side of that case locally, including the lifetime spring coverage its franchise unit's customers document. Where both readings are honestly available, both prices belong on one page.
Then do the arithmetic honestly. List every repair the door needs in the next year or two, not just today's failure: the second spring, the rusting bottom section, the opener at year fourteen. If that list totals half or more of a new door's installed price, replacement is usually the better money, and it resets the clock on every part at once, with modern safety sensors and insulation the old door never had.
Where repair clearly wins: a sound door under about twelve years old with one failed part. Where replacement clearly wins: multiple damaged sections, rust through in more than the bottom panel, or a door whose maker no longer exists. Everything between is a judgment call, and the right output of the visit is both prices in writing, with the panel support question answered in plain words.
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