When your spring breaks and a technician tells you to replace it, a common question comes up — should you go with one spring or two? Some companies push for two automatically. Others replace only what broke. The right answer depends on your specific door.
Here’s an honest breakdown so you can make an informed decision — not just go with whatever someone tells you on the spot.
First — Understand the Two Types of Springs
Not all garage doors use the same spring system. Before answering one or two, you need to know which type you have.
Torsion Springs
Mounted horizontally above the door on a metal shaft. Most modern homes have this system. Smaller or lighter doors often use one torsion spring. Heavier or wider doors — especially two-car garage doors — typically use two.
Extension Springs
Mounted on the sides of the door, running along the horizontal tracks. These always come in pairs — one on each side. If one breaks, both should be replaced at the same time. Always.
One Torsion Spring — When It Makes Sense
Single torsion spring setups are perfectly fine for the right door. A standard single-car garage door that’s not too heavy is typically designed for one spring. If that’s what your door came with and the spring is the correct size and tension for the door weight, one spring does the job.
The downside
One spring means one point of failure. When it breaks — and it will eventually — the door stops completely. There’s no backup. For some homeowners that’s fine. For others, especially those who rely on the garage as their main entry, it’s worth upgrading to two.
Two Torsion Springs — When It’s Worth It
Two springs share the load equally. This has real advantages beyond just having a backup.
Each spring works less
Two springs rated for 10,000 cycles each, sharing a load that one spring would handle alone, will each last significantly longer than a single spring doing all the work. The math is simple — less stress per spring means more life per spring.
Better for heavier doors
Two-car garage doors, wood doors, and insulated steel doors are significantly heavier than standard doors. Running one spring on a heavy door puts it under far more stress than it was designed for. Two springs is the correct setup for these doors — not an upsell.
Redundancy
If one spring breaks on a two-spring system, the door usually still operates — slower and harder on the opener, but it moves. This gives you time to schedule a repair rather than dealing with an emergency. For a garage that’s your main entry point, that matters.
Should You Replace Both Springs at Once?
If you have two springs and one breaks, the honest answer is yes — replace both.
Both springs were installed at the same time and have the same number of cycles on them. The one that didn’t break is at the same point in its life as the one that did. Replacing only the broken one means you’re paying for another service call within months — plus labor twice instead of once.
It’s not an upsell when both springs are the same age. It’s the practical choice.
The Short Version
Extension springs: Always replace in pairs. No exceptions.
Single-car light door: One torsion spring is fine if that’s how it was designed.
Two-car door or heavy door: Two torsion springs is the correct setup, not optional.
One spring broke on a two-spring system: Replace both — same age, same wear.
SPRING REPLACEMENT · UPSTATE SC
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