2026-07-17 7 min read
Here's what most homeowners don't realize about garage door springs: there are two completely different types, and they work in opposite ways. One sits above your door and twists. The other hangs on either side and stretches. Most people never learn the difference until something snaps, then they're calling for emergency service. Understanding which system you have, and how it functions, puts you in control of repair decisions and costs.
Your garage door weighs between 300 and 500 pounds. That weight needs to be balanced so the opener can lift it smoothly. Torsion springs do this by storing rotational energy. Extension springs do it by stretching under load. Each design has its own lifespan, failure pattern, and repair cost.
Torsion springs mount horizontally above the door opening on a steel shaft. As the door closes, the springs wind up tightly, storing energy like a clock spring. When you open the door, that stored energy unwinds and helps lift the weight. These springs typically last 7 to 9 years with normal use. They're more durable than extension springs and safer because they're contained above the door.
Extension springs run along the top of each vertical track, one on each side. They stretch as the door lowers and contract as it rises. Most residential doors built before 2010 use this design. Extension springs live 5 to 7 years on average. When they snap, the broken coil can whip across your garage with serious force, which is why modern codes require safety cables.
Garage door springs fail because metal fatigues over thousands of cycles. Every time you open and close the door, tiny stress fractures form inside the coil. After 10,000 to 15,000 cycles (roughly one cycle per day for 7 to 9 years), the metal gives way. A snapped spring happens without warning. You hear a loud bang. The door drops hard or becomes extremely heavy.
Temperature swings accelerate wear. Winter cold makes metal brittle. Summer heat makes it expand and contract. Here in Zebulon and the surrounding Wake County area, we see spring failures spike in late fall and early spring when temperatures swing 30 degrees in a week.
Rust also weakens springs faster. If your garage stays damp or you live near salt air, corrosion eats into the metal, shortening lifespan significantly. Overuse and poor maintenance multiply these factors. If you haven't had a tune-up in years, dirt and lack of lubrication add stress to the system.
**Need garage door springs in Zebulon today?** Call 1-984-646-0343. we cover same-day service across the area.
Springs hold enormous tension. A fully wound torsion spring can snap a finger or break an arm if you slip. Extension springs can snap and whip like a whip. Even experienced mechanics use specialized tools to safely adjust, replace, or remove springs. The shaft supporting torsion springs spins under high torque. One mistake and the whole assembly can fail catastrophically.
Professional technicians have proper tools, safety training, and liability insurance. Zebulon Garage Doors dispatches certified technicians who replace springs the right way, every time. They test the system afterward to ensure balanced operation and smooth door motion.
If only one extension spring has snapped, you can often replace just that one. However, if the other spring is already 6 or 7 years old, it will fail soon after. Most professionals recommend replacing both at the same time to avoid a second service call and ensure balanced operation.
For torsion springs, replacement is almost always the answer. Repairs are rarely practical. A professional can learn more about repair versus replacement decisions to help you choose the right path for your door.
Regular maintenance prevents premature failure. A yearly inspection and lubrication can extend spring life by one or two years. You can read our complete maintenance guide for step-by-step tips.
Spring replacement cost depends on the type, quantity, and your door's weight. Torsion springs run $150 to $300 per spring installed. Extension springs cost $100 to $200 per spring. Labor typically adds $200 to $400. High-end doors or specialty systems cost more. The best way to know is to schedule a free quote from a technician who inspects your door in person.
When you call, describe what happened: did the door stop opening, drop suddenly, or become extremely heavy? Tell them how old the door is and whether you've had springs replaced before. This helps them arrive with the right parts and tools for same-day service if needed.
If you hear a loud snap or bang from the garage, stop using the door immediately. Don't try to force it open or closed. A broken spring can damage the opener, tracks, and panels. Contact a professional right away. If the door is stuck up, don't leave it that way. Broken springs leave the door unsupported and it can fall unexpectedly.
If your door is old and springs are starting to wear, address it proactively. Browse our full garage door springs service options to see what we offer, then call us at 1-984-646-0343 for an estimate.
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How do I know if my garage door spring is broken? The door becomes extremely heavy to open manually, or it won't open at all. You may hear a loud snapping sound. The door might drop suddenly or hang unevenly. Stop using the door and call a professional immediately.
Can I replace a garage door spring myself? No. Springs hold dangerous tension and can cause serious injury. Professional technicians use specialized tools and have liability insurance. DIY replacement risks broken bones, lacerations, or worse.
How long do garage door springs last? Torsion springs last 7 to 9 years with normal use. Extension springs last 5 to 7 years. Lifespan depends on door weight, frequency of use, maintenance, and climate conditions.
What's the difference between torsion and extension springs? Torsion springs sit above the door and twist to store energy. Extension springs hang on the sides and stretch. Torsion springs are safer and more durable but cost slightly more to replace.
How much does spring replacement cost? Typical cost ranges from $300 to $600 for both springs installed, depending on type, door weight, and your location. Call for a free estimate from a local technician.