Many roof leaks come from a single failure point, not the whole roof. Flashing around a chimney, a cracked rubber boot around a vent pipe, or a few shingles lifted by a storm can all let water in while the rest of the roof is still sound. In those cases, a targeted repair is the right call.
A replacement makes more sense when the problems are everywhere. Signs include shingles that are curling or cupping across the roof, bare spots where the granules have worn away, soft spots when you walk the decking, and leaks showing up in more than one place.
Age matters too. Standard asphalt shingles in our climate usually last somewhere around twenty years. If your roof is near that age and needs a significant repair, putting that money toward a new roof is often the better long-term choice.
The only way to know for sure is to get up there and look. We inspect the shingles, flashing, and decking, show you what we find, and give you a written estimate for whichever option makes sense.