We are not going to post a flat price here, because the honest answer is that it depends on what is actually wrong with the door. A broken torsion spring is a different job than a bent track or a dead opener board, and quoting one number before we have seen the door does the homeowner no favors.
What drives the cost on most calls is the age and style of the door, whether the springs are original or already a second set, and whether the opener is factory equipment or something swapped in later. In much of the housing here, built mostly in the 1960s and 70s, the springs and track hardware are original to the house, which means parts the big box stores no longer stock. That adds a little time to sourcing, and it is the one honest limitation worth stating up front: an odd-size torsion spring from that era can mean we need a day to get the right part rather than fix it on the spot.
Either way, you get the number before we touch the door, not after.