A straight maintenance visit - tension check, lube, roller inspection, opener force adjustment - costs less than a spring replacement, and a lot less than an emergency call after a cable snaps with the door stuck halfway up. We don't have a published price list here, so we won't quote you a number sight unseen, but the honest math is simple: catching a worn roller or a slightly under-tensioned spring on a scheduled visit is cheaper than replacing a spring that let go completely, and far cheaper than a new door. One limitation worth saying plainly: if your door is original to the house and hasn't had any maintenance in 25 years, there's a real chance the visit turns into a spring replacement on the spot, because some components are past adjusting and need swapping. We'll tell you which situation you're in before we do any work, not after.