2026-09-16 6 min read
If you've got a stuck garage door or you're wondering what those heavy metal coils above your door actually do, you're not alone. The springs in your garage door do the heavy lifting, quite literally. Two main types power most doors: torsion springs and extension springs. Knowing which one you have matters because they fail differently, cost different amounts to replace, and require different safety precautions when something goes wrong.
Your garage door weighs between 300 and 500 pounds. Lifting that weight manually every time would be exhausting (and dangerous). Springs counterbalance the door's weight so the opener motor only needs to nudge it up or down. Without working springs, your door either won't open at all or will fall hard. That's why a snapped spring turns your garage door into a paperweight faster than you'd think.
Springs aren't optional parts. They're critical safety components. When one fails, the other spring (if you have two) takes the full load and often snaps within days or weeks. This is why we always recommend replacing both springs together, even if only one has failed.
Torsion springs sit on a horizontal rod above your garage door opening. They twist and unwind as the door moves. A single torsion spring can handle most residential doors in Cupertino and the surrounding Bay Area. If your door is heavier (like if you have a steel or insulated panel), you might have two torsion springs side by side.
Torsion springs typically last 7 to 9 years with normal use. They're more durable than extension springs and they fail more safely. When a torsion spring snaps, it usually breaks at the center, and the door stays roughly balanced. The break is also more obvious, so you'll know immediately you need service.
The cost to replace a torsion spring is higher than an extension spring, but the durability and safety trade-off makes it worth it. Learn more about garage door spring replacement costs in Cupertino for specific pricing details.
Stand in your garage and look directly above the door opening. If you see a tightly wound coil on a metal rod, that's your torsion spring. It will be under extreme tension. Never, ever try to adjust or remove it yourself. The stored energy can cause serious injury.
Extension springs run along both sides of your garage door, parallel to the horizontal tracks. They stretch and contract as the door moves up and down. Most extension springs are found on lighter, single-layer aluminum or vinyl doors.
Extension springs last 4 to 7 years on average. They're less expensive to replace than torsion springs, which appeals to homeowners watching their budget. However, they have a higher failure rate and can snap more unpredictably. When an extension spring breaks, the other one has to support the entire door weight, which often causes it to snap within days.
If you have extension springs, they should also have safety cables running through them. These cables catch the spring if it snaps, preventing it from whipping across your garage. If your safety cables are missing or frayed, that's a serious hazard.
**Need garage door springs in Cupertino today?** Call 669-345-7782. we cover same-day service across the area.
The easiest way: look above your door. If you see a coil running horizontally across the top center, it's torsion. If you see two springs running along the side tracks, they're extension springs. If you're unsure, take a photo and send it to us, or contact us for a free estimate and we'll identify them during our inspection.
Another clue: if your door closes slowly and smoothly, you likely have a newer torsion spring system. If it drops fast and jerky, or if it's stuck halfway, extension springs may be failing.
Many homeowners ask if they can replace just one spring. The answer is no, not really. Both springs share the load. When you replace only one, the new spring and the old spring are now mismatched in strength and wear. The older spring will fail soon after, often within weeks. You'll be paying for two service calls instead of one.
Replacing both springs at the same time also keeps your door balanced and your opener from working harder than necessary. Your opener will last longer, and your door will operate safely and smoothly.
For more guidance on what happens when a spring fails, read about what to do when one snaps.
Spring replacement is not a DIY job. Springs are under thousands of pounds of tension. A mistake can cause the door to fall, the spring to whip, or worse.
If you notice your door is moving slowly, making noise, or sticking, don't wait. Small problems become expensive ones fast. Browse our full spring repair and installation services to see how we can help, or schedule a free quote today.
A working garage door is part of home safety. Springs are the reason it works. Treat them with respect and call a pro when they need attention.
Q: Can I replace just one garage door spring? A: Technically yes, but it's not recommended. Both springs share the load equally. Replacing only one creates imbalance and causes the remaining spring to fail within weeks. Replace both springs together to avoid repeat service calls and ensure safe, even door operation.
Q: How long do garage door springs last? A: Torsion springs typically last 7 to 9 years. Extension springs last 4 to 7 years. Lifespan depends on usage frequency, climate, and maintenance. Regular lubrication and inspection extend spring life and catch problems early before they become emergencies.
Q: What's the difference in cost between torsion and extension springs? A: Torsion springs cost more to replace but last longer and fail more safely. Extension springs cost less upfront but wear out faster and fail more suddenly. Over time, torsion springs often provide better value despite higher initial replacement expense.
Q: Is it safe to repair a garage door with a broken spring myself? A: No. Broken springs store dangerous amounts of tension. Attempting DIY repair risks serious injury or death. Springs can snap unexpectedly, and the door can fall without warning. Always hire a licensed professional for spring replacement or repair work.
Q: How do I know if my garage door spring is about to fail? A: Watch for slow opening or closing, jerking motion, creaking sounds, or the door sticking partway. If you notice your opener running harder or longer than usual, a spring may be weakening. Have it inspected promptly to prevent a full failure that leaves your door stuck.
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