Garage door springs alone cost 30 to 100 for a torsion spring and 20 to 50 for an extension spring.
How to replace a broken garage door extension spring.
Since extension springs are determined by how much weight they each lift and the pulley system cuts this in half you need to replace your old springs with 200 pound extension springs.
Garage door spring cost.
Garage door spring replacement costs 120 to 350 on average.
Step by step replacement of extension springs must be done with caution.
Do not try to remove the extension spring that is not broken when the garage door is closed.
Keep in mind that a long metal spring is being stretched to the point that it will lift your entire garage door which can weigh several hundred pounds.