Garage Door Springs in Thornton: Torsion vs. Extension (And When Yours Snaps)
2026-08-29 7 min read
Your garage door springs are the hardest working part of your entire system. After 15 years on service calls around Thornton and the metro area, I've seen every spring failure imaginable. Let me cut through the confusion: there are two types, they fail differently, and one snapped spring means you need professional help fast. This post walks you through what you're dealing with.
Two Types of Springs (And How They Work)
Most residential doors in Thornton use one of two designs: torsion or extension springs.
Torsion springs sit horizontally above your garage door opening, wound tight like a clock spring. They store energy by twisting. When you push the opener button, that coiled tension unwinds, doing the heavy lifting. These last roughly 7 to 9 years under normal use (about 10,000 cycles). Torsion springs are safer, more reliable, and more expensive to replace.
Extension springs run along the sides of your door frame, parallel to the tracks. They work like a slingshot: they stretch as the door closes, then contract to pull it back up. Extension springs wear faster, typically 5 to 7 years, and they're the culprit in most DIY injuries. A snapped extension spring can whip across your garage with lethal force.
Knowing which one you have matters before you even pick up the phone. Pop your garage door open manually and look above the door. Horizontal coil? Torsion. Vertical springs on the tracks? Extension.
Why Garage Door Springs Fail
Springs fail because metal fatigues. Every single cycle (up and down) bends the metal slightly. After thousands of cycles, that metal crystallizes and snaps.
Rust accelerates this. If you live near moisture, salt air, or skip regular maintenance, corrosion eats into the metal faster. Thornton winters mean salt and road spray, especially if your garage faces the street. Poor lubrication speeds failure too. Springs need annual lubrication with a silicone-based spray.
Cheap springs fail earlier. Some homeowners buy economy replacements to save $50 or $100. You'll be calling again in three years instead of eight.
Weight changes matter as well. If your door is older and you've added insulation or panels, the springs may not be sized right anymore. An undersized spring works harder and dies sooner.
What a Snapped Spring Costs in Thornton
A single snapped spring isn't a small fix. Learn what to expect when your garage door breaks down to get a full picture of common repair expenses.
For torsion springs, expect $200 to $350 per spring, including labor. Most single-car doors have one spring; some heavier doors have two. If both snap (rare, but it happens), you're looking at $400 to $650 total.
Extension springs run $150 to $250 per spring plus labor. They're cheaper parts, but you'll want a professional to replace them safely. Never do this yourself.
**Need garage door springs in Thornton today?** Call 18022754356. we cover same-day service across the area.
Labor costs depend on your specific door and whether we spot secondary damage. A technician will inspect the tracks, pulleys, and cables while we're there. Sometimes a snapped spring damages nearby hardware, which adds cost. Always ask for an estimate before work begins.
Prevention Beats Repair Every Time
The cheapest spring replacement is the one you never need. Schedule annual maintenance with a trusted local technician. Read our garage door maintenance checklist for the full list of what should happen each year. Lubrication, visual inspection, and adjustment take about 30 minutes and cost far less than an emergency call.
Keep your garage reasonably dry. If condensation pools on your door in winter, wipe it down. Use a silicone spray (not WD-40) on springs and hardware every six to eight months.
If your door is 10 years old or older and you haven't replaced the springs, talk to us about proactive replacement. Catching a failing spring before it snaps means you control the timeline and cost. Schedule a free quote or call us at 18022754356 to discuss options.
When It's Time to Call a Pro
Never attempt spring replacement yourself. This isn't a DIY job, no matter how handy you are. Springs are under extreme tension. A slip means serious injury. We've seen broken fingers, gashes, and worse from homeowners who tried.
Our spring service page covers residential and commercial doors across Thornton. We'll diagnose the problem, replace the broken spring (or both if needed), and test the door balance and safety features before we leave.
If your door won't open at all after a loud snap or bang, you likely have a snapped spring. Don't force the door open manually. Call us same-day if possible. The longer you wait, the more stress sits on your opener and other components.
Your garage door springs keep your family safe and your car protected. When one fails, act fast. Thornton Garage Doors is here to help with a real diagnosis and honest pricing.
Frequently Asked Questions
How long do garage door springs last? Torsion springs typically last 7 to 9 years under normal use. Extension springs wear faster, usually 5 to 7 years. Lifespan depends on usage frequency, maintenance, and climate. Rust and poor lubrication shorten life significantly.
Can I replace one spring if only one snapped? You can, but we often recommend replacing both if your door is older than six years. The surviving spring is likely near the end of its life too. Replacing both at once saves you a second emergency call in six months.
What's the difference between a snapped spring and a broken cable? A snapped spring makes a loud bang and the door stops moving. A broken cable usually lets the door drop unevenly. Both require professional repair, but the fix is different. Never assume which one without a technician's inspection.
Is a snapped spring an emergency? Yes. Don't try to force the door open or close. A broken spring means the door has no support. Attempting manual operation risks personal injury and damage to the opener. Call a technician right away.
Do I need both springs replaced even if only one broke? Not always, but it's often smart. If both are original and your door is over six years old, replacing both costs less than a second emergency call. Ask your technician for advice based on the condition of the surviving spring.