There are many aspects that indicate your garage door needs to be replaced. However, the most common indicator that you need a new door is when hinges are broken beyond repair. For swinging doors, the hinges can be repaired when broken. However, when the repairs are done often, the hinges get worn out and become a threat to safety. You can also consider replacement when you need an upgrade for the door. Some garage doors do not allow installation of electric components for automatic operation. See here for information about Why You Should Consider Replacing Your Garage Door.