2026-07-12 7 min read
Your garage door relies on a spring system you probably never think about until it breaks. Torsion and extension springs are fundamentally different mechanisms, and understanding which one your door uses matters for safety, cost, and repair timelines. I've responded to dozens of emergency calls in San Dimas where homeowners didn't realize a snapped spring could leave them trapped or create a genuine safety hazard.
Springs counterbalance your door's weight, making it safe to open and close. Without them, a 300 to 400-pound door would slam down hard enough to cause serious injury. Springs wear out because they cycle thousands of times per year. Most residential springs last between 7 to 9 years under normal use, though climate and maintenance affect this timeline significantly.
San Dimas summers are hot and dry. Temperature swings and dust accumulation accelerate spring fatigue. When a spring finally fails, it doesn't happen gradually. It snaps suddenly, often with a loud bang that sounds like a gunshot. At that moment, your door becomes a hazard. It won't open smoothly, if at all.
Torsion springs sit horizontally above your door opening, attached to a metal shaft. When you open the door, the springs twist (torsion means twisting motion) and store energy that helps lift the door. They then release that energy on the way down, controlling the descent so the door doesn't crash.
Torsion springs are more durable and precise than their counterparts. They last longer and wear more evenly across their lifespan. If you need to learn more about when replacement becomes necessary, that post covers the warning signs in detail.
The downside? Torsion springs require professional installation. The shaft is under extreme tension. Attempting a DIY replacement can cause serious injury or death. I've seen people try this at home, and it never ends well. The energy released when that shaft unwinds can break bones or worse.
A single torsion spring replacement typically costs between $200 and $400, including labor. If both springs need replacement (which is common when one fails, the other is usually near the end of its life), expect $400 to $600 total. Same-day service is available in San Dimas, though emergency pricing may apply for weekend calls.
**Need garage door springs in San Dimas today?** Call (424) 380-4217. we cover same-day service across the area.
Extension springs run along the sides of your door opening, parallel to the horizontal tracks. Instead of twisting, they stretch and contract as the door moves. They're cheaper to install and take up less space, which is why they're common on older doors or budget installations.
The catch? Extension springs are less smooth in operation and wear less predictably. One side can fail before the other, creating uneven door movement. They also require safety cables running through the center of each spring. If a spring snaps without cables in place, the spring can whip across your garage like a dangerous projectile.
Extension springs cost $150 to $250 per spring, plus labor. Because they're simpler to replace, total cost is often lower than torsion work. But they don't last as long, and the safety margin is smaller.
A broken spring doesn't just inconvenience you. It forces all the weight of the door onto your garage door opener, which wasn't designed to handle that load. The opener can burn out in days. You're then looking at a $500 to $1,500 opener replacement on top of the spring repair. If you want to understand that scenario better, check out our guide on when to fix versus replace your opener.
More importantly, a door without functioning springs can drop suddenly and trap a child, pet, or vehicle underneath. In my years doing this work, I've seen minor injuries become serious ones because a broken spring went unrepaired for too long.
Stop using the door immediately. Call a professional the same day if possible. Don't try to manually prop the door open or operate it with a broken spring. The liability and safety risks are too high. Getting a free estimate takes minutes, and our team can usually diagnose the problem over the phone.
If you need to understand the full scope of garage door issues, our troubleshooting guide covers common problems you can identify yourself. But springs are never a DIY fix.
Schedule a free quote today, and let's get your door safe and functional again. Broken springs aren't something to postpone. Call (424) 380-4217 or book online through our service areas. We serve San Dimas and surrounding communities in the Los Angeles basin with fast, honest service.
Spring failure is predictable. Replacement is straightforward for trained technicians. Don't wait until a snapped spring creates a bigger problem.
How do I know which type of spring I have? Look above your door. If you see a horizontal shaft with springs wound around it, you have torsion springs. If springs run vertically along the tracks on each side, those are extension springs. When in doubt, call us for a visual inspection.
Can I replace just one spring if the other is still working? Not recommended. When one spring fails, the other is near the end of its lifespan too. Replacing both at once saves money long-term and prevents another service call in months. Both springs should always match in age and quality.
Is spring replacement covered by my homeowner's insurance? Usually not. Springs are wear-and-tear items, and most policies exclude them. Call your insurance agent to confirm, but plan to budget for this repair yourself. It's a normal home maintenance cost.
How long does a spring replacement take? Torsion spring replacement typically takes 1 to 2 hours. Extension springs take 30 to 45 minutes per side. A two-spring job takes longer but is usually completed within a single service window.
What's the difference between a same-day estimate and a phone estimate? A phone estimate is a rough quote based on what you describe. A same-day estimate means a technician visits your home, inspects the springs and door, and gives you an exact price before starting work. Same-day estimates are free and help avoid surprises.