Torsion vs. Extension Springs in South San Francisco: Which Type Do You Have?
2026-08-07 7 min read A2Z Garage Doors
Most homeowners in South San Francisco don't know which type of garage door springs they have until one breaks. That gap in knowledge costs money. Torsion and extension springs work differently, fail differently, and cost differently to replace. Learning the distinction now prevents confusion and overspending when you need same-day repairs.
What Are Garage Door Springs and Why They Matter
Your garage door weighs 300 to 500 pounds. Springs counterbalance that weight, making the door easy to open and close. Without working springs, your opener would burn out in weeks trying to lift dead weight. Springs are the unsung workhorses that keep your door moving smoothly for 7 to 9 years before replacement becomes necessary.
Two spring types handle this job in South San Francisco homes: torsion springs and extension springs. Understanding which one you have matters because they require different replacement procedures, different tools, and different safety precautions.
Torsion Springs: The Wound-Up Solution
Torsion springs sit horizontally above your garage door opening. They look like a metal rod with coils wrapped tightly around it. When the door closes, these springs wind up like a clock spring. When you open the door, they unwind and release stored energy to help lift the door.
Torsion springs are the modern standard for most homes. They're more durable, more reliable, and balance the door weight more evenly across the opening. They last longer and tend to fail more predictably than extension springs. When a torsion spring snaps, you'll hear a loud bang that sounds like a gunshot.
Extension Springs: The Older Design
Extension springs run vertically along each side of your door opening. They stretch and contract as the door moves up and down. Think of rubber bands that extend when you pull them and snap back when released.
Homes built before the 1980s often have extension springs. They're cheaper upfront but don't last as long as torsion springs. They also require safety cables running through them. Without those cables, a snapped extension spring can whip across your garage with dangerous force.
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How to Identify Your Spring Type
Walk into your garage and look above the door. If you see a horizontal metal rod with coils running along the center, you have torsion springs. If you see two springs running vertically on either side of the door frame, you have extension springs.
Don't touch the springs themselves. They store enormous tension even when the door is closed. Poking or adjusting them can cause serious injury.
One snapped spring doesn't always mean both are failing, but they usually wear out together. If one breaks, the other will likely fail within months. Most repair shops recommend replacing both springs at the same time to avoid a second service call and expense.
Replacement Cost Differences
Torsion spring replacement typically costs more than extension spring work because the installation is more complex. You're looking at $200 to $400 per spring for torsion systems, depending on your door's weight and the spring's gauge.
Extension springs run $150 to $300 per spring. Cheaper, but remember: they need safety cables, and the total lifespan is shorter. Over a decade, torsion springs often prove more cost-effective even though the upfront bill is higher.
If you've already had a snapped spring, check our detailed breakdown on garage door springs repair cost in South San Francisco to avoid sticker shock.
When Springs Need Professional Help
Never attempt DIY spring replacement. The tension in these springs can cause permanent injury or death. Professionals have the right tools, knowledge of proper spring gauge selection, and insurance coverage if something goes wrong.
A qualified technician can schedule a free quote and assess whether you need one spring or both replaced. They'll also check if your door is balanced correctly after replacement, which many DIYers skip.
If you already have a snapped spring, don't use your garage door opener. It will strain and potentially damage the motor. Our guide on what to do with a snapped garage door spring covers immediate steps and safety precautions.
Maintenance Extends Spring Life
Springs don't fail overnight. You can catch early wear signs by scheduling regular garage door tune-ups in South San Francisco. A technician will lubricate springs, check for rust or fraying, and measure spring tension.
In the foggy coastal climate around South San Francisco, rust accelerates spring wear. Salt air corrodes metal faster than inland areas experience. Annual inspections catch rust before it weakens the spring structure.
Simple maintenance like keeping springs lubricated and your garage door balanced can add years to spring life and prevent expensive emergency repairs.
Next Steps
Know your spring type. Check if both springs are intact. If either one has failed or looks worn, contact us for a same-day estimate on garage door spring services.
Call Garage Door South San Francisco at (650) 297-0859 or get a free quote online. We'll identify your spring type, explain your replacement options, and give you an honest price with no surprises.
Frequently Asked Questions
How long do garage door springs last? Torsion springs typically last 7 to 9 years with proper maintenance. Extension springs fail sooner, often at 5 to 7 years. Lifespan depends on use frequency, climate, and lubrication habits.
Can I replace just one spring? Technically yes, but we don't recommend it. The second spring will fail within months. Replacing both at once saves time, money on service calls, and prevents garage door imbalance that stresses your opener.
Why do springs cost so much to replace? Spring replacement requires specialized tools, precise tension adjustments, and significant safety risk. Professional installation ensures proper balance and protects your door and opener from damage.
What's the difference between a snapped spring and a stretched spring? A snapped spring breaks completely and loses all function immediately. A stretched spring still works but has lost tension and won't properly counterbalance your door. Both need replacement.
Do I need safety cables with torsion springs? No. Torsion springs don't require safety cables because they wind around a rod rather than extending. Extension springs must have safety cables to contain the spring if it snaps.