2026-07-11 7 min read
In our 15 years serving Sunnyvale, we've seen this problem again and again: homeowners don't know what type of spring holds up their garage door until one fails. Torsion and extension springs do the same job but in completely different ways. Understanding which one you have matters because the cost, replacement timeline, and safety concerns vary significantly between the two.
Your garage door uses one of two spring systems. Most homes built after the 1980s have torsion springs. Older Sunnyvale homes and some lighter doors run extension springs instead.
Torsion springs sit horizontally above your garage door opening, wound tight like a clock spring. When you open the door, they unwind and release stored energy. This design is safer, lasts longer (typically 7 to 9 years with normal use), and handles heavier doors with ease.
Extension springs run along both sides of your door opening, above the horizontal tracks. They stretch and contract like actual springs. They're cheaper upfront but wear out faster, typically lasting 5 to 7 years, and carry higher safety risks because a snapped spring can send sharp metal flying.
Most modern Sunnyvale homes use torsion. But if your door is older or lighter, you might still have extension springs.
Walk into your garage and look above the closed door. If you see a horizontal spring wound around a metal shaft running left to right, that's torsion. If you see two springs running vertically along the tracks on either side, those are extension springs.
Don't touch either one. Springs under extreme tension can cause serious injury. If you need to inspect or service your springs, call a professional. We've handled countless spring replacements across Sunnyvale and the surrounding Bay Area, and safety is non-negotiable.
**Need garage door springs in Sunnyvale today?** Call 669-257-6136. we cover same-day service across the area.
Torsion springs are the industry standard for a reason. They distribute weight evenly across the door, making the opener work less hard and last longer. The door moves smoothly and quietly.
Because torsion springs sit above the door, a failure is less dangerous than an extension spring snap. The broken pieces stay contained. Replacement typically takes 1 to 2 hours, and a same-day estimate is usually possible if you call early.
The trade-off: torsion springs cost more to replace than extension springs. But they last longer and are safer, which most Sunnyvale homeowners see as worth the investment. If you're unsure about the cost for your specific door, get a same-day estimate from our team.
Extension springs were standard before torsion technology became reliable. You'll find them on vintage homes, lighter single-car doors, or budget garage door systems.
The advantage: lower upfront cost. Extension springs are cheaper to replace than torsion springs.
The disadvantage: safety. When an extension spring snaps, it can whip across the garage or break through the door's safety cables. Injuries happen. They also require safety cables running through the center of each spring to contain a failure. Over time, those cables wear out and need replacement too.
If you have extension springs and one snaps, don't use the door. Call us right away. We service extension spring systems, but we also recommend upgrading to torsion if your door frame allows it. Read more about what to do when a spring snaps.
This is a practical question we hear constantly. Extension spring replacement typically runs $150 to $300 per spring, depending on the door weight. Torsion springs usually cost $200 to $400 per spring, sometimes more for heavy commercial-grade doors.
Both types almost always need replacement in pairs, so double those costs. Labor adds another $100 to $200 to the bill. For a detailed breakdown of what you might expect, review our guide to garage door spring repair costs in Sunnyvale.
Springs wear out from friction, temperature changes, and constant cycling. A typical spring opens and closes your door roughly 10,000 times before failure. That's why springs last 7 to 9 years on average, not indefinitely.
Sunnyvale's climate, with hot summers and mild winters, doesn't stress springs as badly as extreme regions. But rust from coastal humidity and dust from the Bay Area still take a toll.
If you notice a loud bang, a door that won't open, or uneven door movement, a spring is likely failing. Don't wait. A broken spring can damage your opener and leave you stranded. Explore our full range of spring services and schedule help today.
Never attempt to replace or adjust garage door springs yourself. The tension is powerful enough to cause broken bones or worse. Even removing a failed spring requires specialized tools and knowledge.
Garage Door Sunnyvale handles torsion and extension spring replacement for residential and light commercial doors across Sunnyvale. We stock both types and aim for same-day or next-day service on most calls. Schedule a free quote with our team by calling 669-257-6136.
What's the main safety difference between torsion and extension springs? Torsion springs sit above the door and stay contained if they fail. Extension springs run along the sides and can snap violently, potentially injuring someone nearby. Torsion springs are inherently safer.
Can I upgrade from extension springs to torsion? Usually yes, if your door frame and garage structure support the change. Some older doors or lightweight models aren't compatible. We can assess your door and recommend the best option during a free estimate.
How often do springs need maintenance? Springs don't require regular maintenance, but we recommend an annual inspection to catch rust, wear, or misalignment early. This keeps your door running smoothly and extends spring life by catching problems before failure.
What happens if one spring breaks but the other seems fine? Replace both. Springs wear together, and the surviving spring will fail soon after. Replacing both at the same time saves money on labor and prevents another service call in a few weeks.
Can a snapped spring damage my garage door opener? Yes. When a spring fails, the door becomes much heavier. The opener tries to compensate and overworks itself, often burning out the motor. Fix the spring immediately to protect the opener.