When something goes wrong with a garage door, the first thing a technician asks on the phone is “do you have torsion springs or extension springs?” Most homeowners pause. They’ve never had a reason to look. They’re not sure what they have.
Knowing the difference matters. The two systems look different, fail differently, cost different amounts to repair, and carry different safety risks. With thousands of 5-star ratings across Google, Yelp, Facebook, and Thumbtack, Local Garage Doors services both spring types across California and Nevada — and the right diagnostic starts with knowing what’s mounted on your door.
This guide walks through how to identify your spring system in under a minute, what each type does mechanically, and what that means when you need service or replacement. If you already know your spring is broken and need same-day service, call 
866-337-1631, 
email info@localgaragedoors.com, or schedule your appointment today.
The 30-Second Visual Check
You don’t need tools or a ladder. Just walk into your garage with the door closed and look up.
Look at the wall above the door. If you see a long horizontal metal shaft mounted to the wall directly above the door opening — usually with one or two large coiled springs wrapped around it — you have torsion springs. The shaft typically runs the full width of the door. Drums sit at each end where cables attach. The springs sit in the middle of the shaft (single-spring system) or split on either side of the center (two-spring system).
Look at the horizontal tracks on either side of the door. If you see long, thin coiled springs running parallel to those horizontal tracks — stretching from the front of the garage toward the back wall — you have extension springs. There’s one spring on each side of the door, mounted between the front pulley and a back hanger. They’re usually paired with a thinner safety cable threaded through the center of each spring.
That’s it. Torsion springs sit above the door on a shaft. Extension springs sit alongside the horizontal tracks on either side. If you can see at least one of these clearly, you’ve identified your system.
If you see both — that’s not a hybrid system. It’s almost always a torsion system that was added later, with leftover extension hardware that should have been removed. We’ve fixed plenty of installations like this across Sacramento and Bay Area homes where a contractor took shortcuts during a partial upgrade. The extension hardware doesn’t do anything in that case, but it’s not supposed to be there either.
How Torsion Springs Work
Torsion springs counterbalance the door’s weight by twisting under load.
When the door is closed, the springs are wound tight and storing energy — typically 200–300 foot-pounds of torque on a standard residential two-spring system. When you (or the opener) lift the door, the springs unwind, and that stored energy releases through the shaft, which rotates the cable drums, which pull the cables, which lift the door. The system is engineered so the spring force matches the door’s weight almost exactly. The opener only has to overcome a small amount of additional force to start the door moving.
This is why a properly balanced torsion-spring door can be lifted easily by hand when the opener is disconnected. The springs are doing 95% of the work.
Torsion systems have several advantages over extension systems, which is why almost every door installed in the last 20 years uses them. They’re more durable — typical lifespan runs 10,000+ cycles before replacement. They operate more smoothly because the cables don’t stretch and contract through their full range. They’re safer when they fail because a broken torsion spring stays on the shaft rather than flying loose.
The trade-off is that torsion systems are more dangerous to service. The setscrews on the winding cone hold all that stored torque. Loosening them without proper winding bars and proper technique is one of the most common ways homeowners get seriously injured doing DIY repairs.
How Extension Springs Work
Extension springs counterbalance the door’s weight by stretching and contracting.
When the door is closed, the springs are stretched tight along the horizontal tracks — storing energy in the elongation. When you lift the door, the springs contract back toward their relaxed length, pulling on the pulleys and cables that lift the door. Each side has its own spring doing its own work, with the safety cable running through the spring’s center to contain it if it breaks.
Extension springs were the standard for decades — most doors installed before the 1990s used them, and you’ll still find them on older homes across Sacramento, the Bay Area, San Diego, and across California and Nevada generally. Pre-1990s tract homes throughout Berkeley, Pasadena, Burlingame, and the older parts of the Sacramento area still routinely have original extension setups.
They’re less expensive to manufacture, simpler to install in some configurations, and work fine on lighter, shorter doors. The downsides are that they wear faster than torsion springs (typical lifespan around 10,000 cycles, but real-world conditions often shorten it), they operate less smoothly because the cables stretch under load, and they’re more dangerous when they fail. A snapped extension spring under tension can become a high-speed projectile inside the garage. The safety cables running through them reduce that risk significantly — but only if the cables are properly installed and maintained. We’ve serviced extension setups in older homes where the safety cables were missing or had been removed during a previous repair, which is a serious hazard.
What That Means for Service: Repair Cost
Spring replacement ranges from $250 to $800 depending on a few factors, with both spring types fitting within that range — but the breakdown looks different.
Torsion spring replacement typically runs at the higher end on standard residential doors, with two-spring systems on heavier double-car doors landing toward $800. Single-spring torsion systems on standard 7-foot single-car doors fall closer to the lower end of the range. The cost reflects the spring quality, wire gauge, and labor — torsion springs require winding bars, proper cone seating, drum cable threading, and precise tensioning that takes more time than extension work.
Extension spring replacement typically runs at the lower-to-middle end of the range. The springs themselves are less expensive than torsion springs of equivalent capacity, and the labor is somewhat simpler. However, extension setups always include safety cable replacement when the springs are replaced — the cables wear at the same rate as the springs, and any reputable installer replaces them in pairs.
Both systems should always be replaced in pairs on dual-spring setups. Replacing only the broken spring leaves you with one new spring at full strength and one aged spring weeks from failure. Within months, you’re back at the same problem with the surviving spring. We always recommend replacing both at the same time — it costs slightly more upfront and saves a second service call.
What That Means for Service: Lifespan and Replacement Timing
Both spring types are rated in cycles, not years. One cycle equals one open-and-close. A typical residential door averages 1,500 cycles a year — meaning a 10,000-cycle spring lasts about 7 years.
Households that use the door more often hit replacement sooner. A Bay Area family with two working adults and kids, opening the door 8–10 times daily, can wear out a 10,000-cycle spring in 3–4 years. Pool services, contractors during a remodel, frequent deliveries — all of these accelerate spring wear.
Higher-cycle springs (15,000, 20,000, 25,000+ cycle ratings) are available for both systems. We recommend higher-cycle springs for households that use the door heavily, for properties with detached structures used as offices or workshops, and in vacation rental properties common across Lake Tahoe, Truckee, Reno, and the South Lake Tahoe region where high turnover means heavy door use. The cost premium is modest compared to the labor savings of fewer service calls over the door’s lifetime.
Climate matters too. Sacramento, Stockton, and the Central Valley face extreme summer heat that dries out spring lubrication and accelerates wear. Las Vegas and Henderson see the same pattern with even more intense temperature swings. Coastal homes from San Diego to Half Moon Bay deal with salt air corrosion that eats through spring coatings. Lake Tahoe and Sierra foothill homes cycle between freezing winters and dry summers that fatigue the steel.
What That Means for Service: Safety Considerations
Both spring types are dangerous to service. The risks are different.
Torsion springs
Carry their danger in stored energy. A spring under full tension contains enough torque to break a wrist, blind an eye, or fracture a skull if mishandled. The setscrews on the winding cone are the critical control point — loosening them without winding bars properly seated in the cone is how injuries happen. Replacing a torsion spring requires fully unwinding the existing tension before any disassembly, and that requires specific technique most homeowners don’t have.
Extension springs
Carry their danger in projectile potential. A spring under load that snaps or slips off its bracket can travel across a garage at significant velocity. Safety cables threaded through the spring’s center contain most of this risk, but the cables only work if they’re properly installed, properly anchored, and not corroded or frayed themselves. Working on an extension spring with damaged or missing safety cables — which we see in older homes where previous work was done quickly or by homeowners — is genuinely hazardous.
Both systems should be left to trained technicians. The tools, the technique, and the experience to read what the springs are doing before they fail aren’t things you want to learn on the job.
What That Means for Service: When to Consider Upgrading
Most older extension-spring systems can be converted to torsion-spring systems during replacement, and we often recommend this conversion when the existing extension setup is at end-of-life.
The conversion makes sense when:
- The existing extension springs are already failing or have failed
- The safety cables are damaged, missing, or in questionable condition
- The door has been re-paneled, re-insulated, or otherwise made heavier than the original spring spec
- The homeowner wants smoother, quieter operation (torsion is noticeably quieter)
- The garage is attached to living spaces where noise matters
- The garage door is used heavily enough to benefit from torsion’s longer cycle life
The conversion isn’t always cheaper than a like-for-like extension replacement, but the long-term value usually wins out — especially given the safety improvement. We assess this during any spring inspection on extension-spring setups across California and Nevada, and we’ll walk through the options without pushing the conversion if the existing extension system is working fine.
The Bottom Line
Torsion springs sit above the door on a horizontal shaft. Extension springs run alongside the horizontal tracks on either side. Once you’ve identified which system you have, you know more about your door than most homeowners — and you can have a much faster, more accurate conversation when service is needed.
Both systems are dangerous to work on without training. Both should be replaced in pairs when one fails. And both have a finite lifespan that’s worth tracking before they fail at the worst possible moment.
Call us at 866-337-1631,
email info@localgaragedoors.com.
🗓️Book an appointment online — same-day service available across California and Nevada.