You should not fix a broken garage door spring yourself unless you are experienced and have proper tools, as garage door springs store extreme high tension and can cause severe injury or death if handled incorrectly, making it dangerous DIY repair. Torsion springs that mount above door and extension springs along tracks are under hundreds of pounds of tension to counterbalance door weighing 150 to 300 pounds, and when broken, remaining spring still under tension and new spring must be wound with winding bars that require precise technique, and if winding bar slips or spring unwinds suddenly, it can strike with lethal force. Professional garage door technicians have training, winding bars, and safety equipment to replace springs safely and ensure proper size and balance, costing 200 to 400 dollars for single spring and 300 to 600 dollars for pair, which includes warranty. Extension springs are slightly less dangerous but still can snap and cause injury. If you attempt DIY, you risk incorrect spring size that makes door unbalanced, damaging opener, door, and tracks, and voiding warranty. Many states require licensed professional for spring replacement. If you must DIY, you need to buy correct spring size based on door weight and height, use proper winding bars not screwdrivers, wear safety glasses, and follow manufacturer instructions precisely, but it is strongly recommended to hire professional for safety. Regular maintenance like lubricating springs extends life and avoids need for replacement.
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