The short answer
Most Residential Doors Benefit From Annual Service
For many residential garage doors, a professional inspection once a year is a sensible starting point. Manufacturer guidance commonly recommends annual maintenance, while some doors may benefit from semi-annual checks when they operate frequently or face demanding conditions.
The calendar is only a baseline. A door that suddenly becomes heavy, crooked, noisy or inconsistent should be inspected when the change appears—not months later because the planned service date has not arrived.

