Torsion vs extension garage door springs: what's the difference?
Short answer
Torsion springs mount on a bar above the door and twist to lift it. They are smoother, last longer and are standard on most South Florida doors. Extension springs run along the side tracks and stretch. The parts usually cost less, but they need safety cables. Send us a photo of your springs and we tell you which type you have and quote the replacement.
How do I tell which springs I have?
Close the door and stand inside the garage.
- Torsion: one or two large coil springs on a metal bar (shaft) that runs across the top of the door opening, with cable drums at each end.
- Extension: two long springs running parallel to the horizontal tracks near the ceiling, one on each side, connected to pulleys and cables.
Torsion vs extension at a glance
| Torsion springs | Extension springs | |
|---|---|---|
| Where they mount | On a bar above the door | Along the side tracks, near the ceiling |
| How they work | Twist (wind) to store energy | Stretch to store energy |
| Door movement | Smoother and more balanced | Can be jerkier as springs age |
| When one breaks | Stays on the bar | Can whip loose without safety cables |
| Typical on | Most double and newer doors in South Florida | Older or lighter single doors |
| What we replace | Both springs (or the one spring on a 1-spring door) | Both springs, with safety cables |
Which lasts longer?
Spring life is measured in cycles: one open plus one close. Standard springs for both types are commonly rated around 10,000 cycles. Torsion springs tend to wear more evenly because they twist on a supported bar, and higher-cycle torsion springs are available for doors that move many times a day. In Miami, humidity and salt air cause rust that weakens spring wire, so real-world life can be shorter than the rating. See how long garage door springs last in Miami.
Why do extension springs need safety cables?
An extension spring is stretched tight every time the door closes. If it snaps without a cable running through its center, the broken pieces can fly across the garage. A safety cable keeps the spring contained. Every extension spring pair we install includes safety cables.
Is it safe to replace springs myself?
Neither type is a good DIY job. Torsion springs are wound under high torque and need winding bars and the right number of turns for the door’s weight. Extension springs are stretched under load when the door is closed. Industry guidance (DASMA TDS-190) is that springs should match the door’s counterbalance requirement and be installed per the manufacturer’s instructions; a wrong spring wears out the opener and makes the door unsafe to lift by hand.
How do I get a quote for my door?
WhatsApp us a photo of the springs, or text it to (561) 724-0724. We’ll identify the type and send a written quote. What changes the cost is explained in our spring repair cost guide.