garage door springs are one of the most important parts of your garage door. They are what help to counterbalance the weight of your door so that it can be opened and closed with ease. Over time, however, these springs can become worn down and need to be replaced. The cost of replacing a spring on a garage door can vary depending on a few factors, such as the type of spring needed and the size of your garage door. Generally speaking, you can expect to pay anywhere from $100 to $300 for a new spring.