Torsion vs. Extension Springs: Which Does Your Duluth Garage Door Have?
Quick answer: most residential garage doors use either torsion springs, mounted on a metal shaft directly above the closed door, or extension springs, stretched along the horizontal tracks on either side. Both do the same job, counterbalancing the door’s weight so the opener isn’t doing all the lifting, but they differ in cost, lifespan, and how they fail. Here’s how to tell which one you have and what that means for repairs.
How to Tell Which Type You Have
- Torsion springs: one or two tightly wound springs mounted horizontally on a metal rod directly above the closed door, usually centered.
- Extension springs: long springs that run above the horizontal sections of track on each side of the door, stretching and contracting as the door moves.
Torsion Springs
Torsion springs wind and unwind on a shaft as the door opens and closes, which gives smoother, more controlled movement and generally puts less strain on the opener. They’re standard on most doors installed in recent years and tend to hold up well with normal use. They’re also more specialized to service, the spring is under significant tension even with the door closed, so this is firmly a job for a technician with the right winding bars and experience, not a DIY repair.
Extension Springs
Extension springs are common on older garages and some lower-headroom setups where a torsion shaft doesn’t fit well above the door. They’re generally less expensive hardware, but should always be paired with safety cables that run through the center of each spring, if a spring snaps under tension without one, it can become a projectile. If your garage has extension springs without visible safety cables, that’s worth having a technician address even before anything else fails.
Torsion vs. Extension: Side by Side
| Torsion | Extension | |
|---|---|---|
| Location | Single shaft above the door | Above the horizontal tracks, one per side |
| Operation | Smoother, less opener strain | Can be jerkier without regular maintenance |
| Common on | Most doors installed in recent years | Older garages, lower-headroom setups |
| Safety note | Under constant tension, service only by a technician | Should have safety cables through each spring |
Does It Affect Repair Cost?
Both types fall within similar overall ranges for replacement, the bigger cost factor is usually whether one spring or both need replacing, and the size and weight of your specific door, not which system it uses. See our cost guide for current ranges, or our spring replacement page for more detail on the service itself.
Neither Type Is a DIY Job
Whichever system your door uses, the spring is storing real mechanical energy any time the door is closed. We always recommend leaving spring work, inspection, adjustment, or replacement, to a technician with the right tools and training, this is one of the few garage door issues where the DIY risk genuinely isn’t worth it.
Frequently Asked Questions
Can I switch from extension springs to a torsion system?
Yes, it’s sometimes done when replacing an older door or upgrading an aging setup, it usually means added hardware and labor beyond a straight spring swap. We can tell you whether it makes sense for your garage during an on-site visit.
How do I know if I have one or two torsion springs?
Look at the shaft above the door, a single wide spring in the center is a one-spring system, two separate springs side by side is a two-spring system. Either is normal, the right setup depends on the door’s weight.
Do extension springs need safety cables even on a lightweight door?
Yes, regardless of door weight. A spring under tension can fail unpredictably, and the safety cable is inexpensive insurance against it becoming a hazard if it does.
Is one type of spring louder than the other?
Extension springs can be a bit noisier in operation, especially if the guide rods or pulleys they run through aren’t well lubricated. A torsion system is generally quieter by design.
If only one spring in a two-spring torsion system breaks, do I need to replace both?
We generally recommend replacing both at the same time, even though only one failed, the surviving spring has typically seen the same wear and often fails not long after. It also keeps the door balanced evenly on both sides.