A single loud bang from the garage, followed by a door that suddenly weighs twice what it should, almost always means one thing: a snapped torsion spring. Garage door torsion spring replacement is one of the most common repairs on a residential overhead door, yet it is also one of the few DIY jobs where a careless move can send a winding bar flying across the garage. Understanding how the system works, what parts you need, and where the real danger lies will help you decide whether to grab your tools or call a pro.
Part of our Garage Doors guide — explore the full guide →
How a Torsion Spring System Works
Torsion springs sit on a metal shaft mounted horizontally above the door opening. Unlike extension springs that stretch along the tracks, torsion springs store energy by twisting. When you open the door, the springs unwind and transfer their stored torque through cable drums to steel lift cables, which do the heavy work of raising a panel assembly that can weigh 150 to 400 pounds.
Because these springs carry the entire load of the door, they are under tremendous tension even when the door is closed. A standard 7-foot-tall double door typically uses a spring rated for roughly 10,000 to 15,000 open-close cycles. At two cycles per day, that spring is engineered to last about 7 to 14 years. Homeowners who open the door six or eight times daily will burn through that lifespan far faster.
Signs Your Torsion Spring Has Failed
The clearest sign is a visible gap in the coil. A healthy spring is a tight, continuous helix; a broken one shows a one to two-inch separation where the metal fatigued and let go. Other symptoms point to a spring on its way out rather than one that has already snapped.
- The door will not open with the opener — the motor strains, hums, or reverses because it is not built to lift the full weight alone.
- The door slams shut or drops several inches when you try to lift it manually.
- The top section bends as the opener fights a load the spring should be carrying.
- You hear loud pops or grinding as the cables jump the drums.
Never operate the opener repeatedly on a door with a broken spring. Forcing it can bend track, strip the opener gears, or pull the cables loose, turning a single-part fix into a multi-part repair.
Single vs Double Spring Setups
Many double doors use two torsion springs, and here contractors follow a firm rule: when one breaks, replace both. Springs on the same door age at the same rate, so a spring that outlived its twin is usually only months from failing itself. Replacing the pair means one trip, one setup, and balanced tension across the shaft.
If your door was built with a single oversized spring, you replace that one unit but should verify the wire size, inside diameter, and length match exactly. A spring that is even slightly off spec will leave the door heavy at the floor or floating at the top, both of which strain the opener and the cables.
What Replacement Costs
Hiring a professional for garage door torsion spring replacement generally runs $200 to $350 for a single spring and $300 to $500 for a pair, including parts and labor. The springs themselves cost $30 to $100 each depending on size and cycle rating. Upgrading to a high-cycle spring rated for 20,000 or 30,000 cycles adds $40 to $80 but can double the service life, a worthwhile trade for a busy household.
Emergency or after-hours service pushes prices higher, sometimes $450 or more. If a technician is already replacing springs, it is smart to have them inspect the cables, rollers, and bearings, since a $15 bearing installed during the same visit is far cheaper than a separate service call later.
The Tools and Parts You Need
If you decide to tackle the job, buy the correct hardened-steel winding bars sized for your spring cones — usually 1/2-inch bars for residential springs. A screwdriver is not a substitute and has caused countless broken fingers. You will also want:
- Two matching torsion springs of the exact wire gauge, length, and inside diameter
- A set of winding bars, typically 18 inches long
- A 7/16 and 1/2-inch wrench or a socket set for the set screws
- Locking pliers or a C-clamp to secure the door
- Leather gloves and safety glasses
Measure the old spring carefully. Record the wire diameter across 10 and 20 coils, the total length, the inside diameter stamped on the cone, and the wind direction. The left spring and right spring are wound opposite each other, and installing them reversed will cause immediate failure.
Why This Repair Demands Respect
Torsion springs store enough energy to break bones. The single most important safety step is to fully unwind the old spring before loosening any set screw. Insert a winding bar, hold it firmly, back off the set screws, and let the spring release its tension in controlled quarter-turns. Keep your head and body out of the plane of the bars at all times.
When winding the new spring, the rule of thumb is one quarter-turn of tension for every foot of door height, plus a small adjustment. A 7-foot door usually needs about 7.5 to 7.75 turns. After winding, test the balance: the door should stay put when lifted halfway. If it drifts up, back off a quarter-turn; if it drops, add one.
Homeowners uncomfortable with any part of this process should hire a licensed technician without hesitation. The savings on labor are never worth a serious injury, and a professional can complete a proper torsion spring replacement, rebalance the door, and lubricate the system in under an hour.
Extending the Life of Your New Springs
Once the springs are in, a little maintenance pays off. Apply a light garage-door lubricant or 3-in-1 oil to the coils twice a year to reduce friction between the windings. Keep the door balanced by testing it every few months — disconnect the opener, lift the door halfway, and confirm it holds. A door that has drifted out of balance is silently overworking the springs and the opener alike.
Treat the torsion spring as the heart of the whole system. Replace it promptly, match the specs exactly, and respect the stored energy, and your garage door will open smoothly and quietly for another decade.
Choosing High-Cycle Springs
Standard springs are rated for about 10,000 cycles, but that number is not fixed by nature — it is a function of the wire gauge and the spring’s dimensions. By using a slightly thicker wire and a longer spring wound to the same tension, a manufacturer can build a spring rated for 20,000, 30,000, or even 50,000 cycles. Because one open-and-close counts as a single cycle, a 20,000-cycle spring genuinely doubles the expected service life of a 10,000-cycle unit under the same daily use.
For a household that uses the garage as the main entrance, upgrading to high-cycle springs is one of the smartest small investments you can make. The added cost is usually $40 to $80 per spring, and you may only replace the springs once in the time you own the home rather than two or three times. Ask your supplier or technician to spec a higher-cycle spring using the same mounting cone and shaft so it is a direct swap.
Frequently Asked Questions
Can I replace just one spring on a two-spring door? You physically can, but professionals strongly advise against it. Both springs have endured the same number of cycles, so the survivor is likely near failure too. Replacing both at once means balanced tension and one service instead of two.
How long does the job take? An experienced technician replaces a pair of torsion springs, rebalances the door, and lubricates the system in 30 to 60 minutes. A careful first-time DIYer should budget two to three hours and read the winding instructions thoroughly first.
Why did my spring break in winter? Cold weather makes steel more brittle and the garage door heavier, so springs already near the end of their life often snap on the first frigid morning. The cold did not cause the failure so much as reveal a spring that was already worn out.
Is it worth hiring a pro? For anyone uneasy with the stored tension, yes. The labor is modest — often $100 to $200 over parts — and a professional guarantees correct sizing, winding, and balance while eliminating the injury risk entirely.
