What is a garage door torsion spring?
Updated August 2026
A garage door torsion spring is the tightly wound steel spring mounted on a shaft above the door opening, storing enough energy to counterbalance the door's full weight. The spring lifts the door, not the opener. A double-wide door weighs 150 to 250 pounds, and the 1/2-horsepower motor bolted to the ceiling has only enough muscle to guide a load the spring has already made nearly weightless. Wound correctly, a door floats: raise it halfway by hand and it stays there.
Where it is
Look at the header above the door. A torsion spring rides on a 1-inch steel shaft that spans the opening, anchored at a center bracket, with a grooved cable drum at each end; wide or insulated doors carry two springs, one on each side of that bracket. The other system, extension springs, stretches along the horizontal tracks near the ceiling on both sides instead. Color-coded end cones tell a technician the wire gauge and the wind direction. A broken spring identifies itself: a gap of about 2 inches sits in the middle of the coil where the steel let go.
What it does
Closing the door twists the spring tighter and banks energy; opening it spends that energy back. Springs are rated in cycles, one cycle being a trip up and a trip down, and the builder-grade spring carries a 10,000-cycle rating. For a household coming and going 3 or 4 times a day, that is 7 to 14 years; for a family that treats the garage as the front door, closer to 5. There is no gradual decline. The spring snaps with a bang loud enough to wake the house, usually on a cold night, and from that moment the door is dead weight. An opener that keeps trying will strain, lift the panel 6 inches, reverse, and eventually strip its own plastic gears, which adds $150 to $350 to the bill. Cables jump the drums and the door racks crooked in its tracks.
Maintenance
A worn spring cannot be restored, but it can be kept from dying early. Every 6 months, spray a garage-door lubricant (lithium or silicone, never a penetrating oil) along the spring coils, hinges, rollers, and bearing plates, because dry steel rusts and rusted coils fatigue sooner. Twice a year, run the balance test: pull the red release cord, raise the door halfway by hand, and let go. A balanced door holds position. One that slams down or drifts up is out of tune, and re-tensioning is a technician's job. Timing lives in how often to replace garage door springs, the rest of the routine in the garage door checklist, and the price of skipping both in what neglected garage door maintenance costs.
What it costs to replace
A replacement garage door torsion spring runs $150–350 installed, $250–500 for a matched pair swapped at the same visit, and $50–150 extra to step up to a 20,000-cycle spring.
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Frequently asked questions
Can I replace a garage door torsion spring myself?
Almost nobody should. A wound spring holds a few hundred foot-pounds of torque, and releasing it wrong breaks wrists and worse. The job needs two correctly sized winding bars, never screwdrivers, plus an exact match on wire gauge, inside diameter, and length. A pro carries the right spring, swaps the pair, sets tension, and re-balances the door in under an hour for $150–350 per spring. The homeowner's share of this work is the diagnosis: find the 2-inch gap in the coil and make the call.
How do I know if the spring broke or the opener died?
Pull the emergency release cord and lift the door by hand. If it will not budge or feels like a loaded barbell, the spring is gone. If it glides up smoothly and holds halfway, the spring is fine and the fault sits in the opener, its drive gear, or the logic board. Supporting evidence for a broken spring: a bang overnight with nothing else wrong, a visible gap in the coil, or an opener that hums for 2 seconds and quits.
Should both springs be replaced when only one breaks?
On a two-spring door, yes. Both went up the same day and have taken the same number of cycles, so the survivor is usually months from failing. Adding the second spring while the technician is already on site costs $50–100 more, against another $150–350 service call later. On a single-spring door, ask what a high-cycle upgrade costs: 20,000-cycle springs run $50–150 above standard and roughly double the years before you repeat this.
Are torsion springs better than extension springs?
For most doors, yes. Torsion hardware sits on a shaft above the opening, winds rather than stretches, balances the door evenly, runs quieter, and stays contained when it breaks. Extension springs stretch along the side tracks and can launch across the garage, which is why safety cables threaded through them are required; a pair costs $15–30 and takes 20 minutes to add. Converting extension to torsion runs $250–500 and needs roughly 12 inches of headroom above the door.