The most common surprise on a 2001-built garage is the opener. Most homes here still have whatever came with the house, and units from that era predate rolling-code security standards - a gap we check on every install in Union Hill-Novelty Hill rather than assuming the new door will pair fine with the old motor. Sometimes it won't, and that turns a door swap into a door-and-opener job.
The other spot where jobs run long: framing. With roughly 8,555 households spread across varied lot sizes and driveway approaches here, no two openings are built quite the same, and we measure before quoting rather than after. If the header's been shimmed or the jamb has settled unevenly, that gets fixed before track goes up, which can add time we didn't originally quote.
One honest limitation: if your existing opener is more than a few years past its working life and the track hardware is original to a 2001 build, replacing just the door and reusing everything else usually isn't worth doing. We'll say so rather than sell you a door that's fighting thirty-year-old springs.