You’ll often find walk-in doors on commercial and residential buildings because they are more energy efficient, after all, you lose less heat or cold air by opening a small access door than by opening a 10′ x 10′ garage door.
Walk-in doors are also practical if you have a big garage, having to walk around the structure to access it without a walk-in door may often seem impossible. While a power outage may stop you from being able to access your garage because of an electric door, you will still be able to enter through this alternative entry point, making walk-in doors a great option to have overall.