Repair is often reasonable when
The damage is isolated, the surrounding material remains serviceable, matching materials are available and there is no broad decking or moisture problem.
Replacement becomes more likely when
Damage affects multiple slopes, materials are brittle or discontinued, leaks repeat in different locations, decking needs extensive work or storm impact is widespread.
Use the roof's condition—not age alone
Age is useful context but not a complete diagnosis. Installation quality, ventilation, exposure, maintenance, material type and storm history also influence condition.
Compare written scopes
A repair proposal and replacement proposal should each explain assumptions, included components, exclusions, cleanup, access, warranties and what happens if hidden damage is discovered.