What is the average cost to replace a spring on a garage door?

The average cost to replace a spring on a garage door varies by spring type, door size, and whether you hire a professional, which is strongly recommended. For a professional replacement, a single torsion spring, which is mounted above the door and does the counterbalancing, typically costs 200 to 400 dollars total, including the spring itself and labor. If your door uses two torsion springs, which is common on double-wide doors, replacing both at the same time costs 300 to 600 dollars total, which is more cost-effective because when one breaks the other is near the end of its life and will fail soon, saving you a second service call fee of 75 to 150 dollars. Extension springs that run along the side tracks are cheaper, with professional replacement of a pair costing 150 to 350 dollars. The spring part itself costs 50 to 150 dollars for a torsion spring and 20 to 50 dollars per pair for extension springs, while labor is 100 to 250 dollars. Factors that raise cost include heavy wood doors requiring larger springs, high-cycle springs rated for 20,000 cycles that cost more but last longer, emergency or after-hours service adding 50 to 100 dollars, and extra parts like cables or bearings that may need replacement. DIY spring cost is lower for parts only, but not recommended due to high tension danger.