7 min read A2Z Garage Doors
After 15 years turning wrenches on Sunnyvale garage doors, I've learned that most homeowners don't know which type of spring they have, let alone why it matters. The truth is simple: understanding whether you've got torsion or extension springs can save you money, headaches, and potentially a nasty accident. Let's cut through the confusion and get you the facts.
Your garage door probably weighs 300 to 500 pounds. Without springs, that weight would crush your opener in seconds and make manual operation nearly impossible. Springs counterbalance that load, storing and releasing energy each time the door opens or closes.
Two main types handle this job in Sunnyvale homes: torsion springs and extension springs. They work differently, cost different amounts to replace, and have different lifespans. Getting the right one installed matters more than most people realize.
Torsion springs sit horizontally above your garage door, mounted on a metal rod that runs across the opening. When you open the door, the spring twists (torque, hence the name), and that rotational force lifts the weight. When you close it, the spring unwinds, controlling the descent.
Here's what makes torsion springs the preferred choice for most homes and commercial buildings: precision, safety, and durability. A properly balanced torsion spring delivers smooth, controlled motion. The door rises and falls evenly. Your opener doesn't strain. And because the spring does most of the heavy lifting, wear on the opener's motor slows down.
Most torsion springs last 7 to 9 years with normal use. Some last longer if maintained well. When they do snap, the door becomes dead weight immediately. But a snapped torsion spring is easier to diagnose than its counterpart. The door simply won't budge without the opener working harder.
**Need garage door springs in Sunnyvale today?** Call 669-356-8618. we cover same-day service across the area.
Extension springs hang on either side of the door track, stretching and contracting as the door moves. They're lighter duty than torsion springs and cheaper to purchase and install. For smaller, lighter doors or budget-conscious homeowners, they get the job done.
The tradeoff is real, though. Extension springs don't last quite as long as quality torsion springs. They put more stress on your opener because they don't distribute the load as evenly. And if one snaps, the other side still carries tension, creating uneven stress on the door and track. That imbalance often leads to bent tracks or damaged openers shortly after.
One more thing: extension springs require safety cables running through the center of each spring. If the spring breaks, those cables catch the broken coils and prevent them from flying across your garage at dangerous speed. Torsion springs don't need this because of their mounting design, though the tension itself is still serious and should only be handled by trained technicians.
Look up at your garage door opening, roughly in the middle above the door. If you see a tightly wound metal coil running horizontally across the top, that's torsion. If you see springs stretched vertically on each side of the tracks, those are extension springs.
When you need replacement, learn more about garage door spring replacement and what to expect cost wise. If you already know you've got a problem, don't wait. A snapped spring makes your door inoperable and puts strain on the rest of the system.
A snapped spring usually announces itself with a loud bang. Some people report hearing it from inside the house. The door won't open smoothly or may not open at all. The opener might run but the door doesn't move. You might feel resistance or grinding.
If this sounds like your situation right now, read our guide on what to do with a snapped garage door spring in Sunnyvale. More importantly, call us for same-day repair. Driving on a broken spring is dangerous and damages other parts quickly.
Torsion springs typically cost more upfront but save money long-term through durability and lower opener wear. Extension springs are cheaper initially but may require opener service sooner. Both benefit from regular maintenance. Keeping tracks clean, lubricating hinges, and having your system checked annually helps springs last longer.
If you're curious about the full cost breakdown before calling, check our detailed spring repair pricing guide to know what to expect. Most Sunnyvale homeowners find the cost reasonable when they understand what goes into safe, professional spring work.
Ready to move forward? Schedule a free estimate and we'll identify your spring type, assess the condition, and give you honest pricing. Many jobs can be wrapped up the same day you call.
How do I know if my garage door spring is broken? The door won't open smoothly, feels heavy to lift manually, or the opener runs without moving the door. You may hear a loud bang before symptoms appear. Never force a broken spring door open.
Can I replace garage door springs myself? No. Spring tension holds hundreds of pounds of force. A mistake can cause serious injury or death. Always hire a licensed technician for spring work in Sunnyvale or anywhere else.
How much do garage door springs cost to replace? Torsion springs typically run $200 to $400 per spring. Extension springs are $150 to $250 each. Labor adds another $150 to $300 depending on your door's age and condition.
How long do garage door springs last? Torsion springs typically last 7 to 9 years. Extension springs last 5 to 8 years. Lifespan depends on usage frequency, maintenance, and climate. Sunnyvale's moderate weather helps springs stay in good shape longer than hotter regions.
What's the difference between one spring and two springs? Most single-car doors use one torsion spring. Two-car doors often have two. Extension spring systems always have two (one per side). The number depends on your door's weight and size, not preference.