If you just heard a loud bang from your garage and now the door won’t open, there’s a good chance one garage door spring is broken. The next question homeowners ask us all the time is simple: Do I really need to replace both springs, or can I just replace the broken one?
Here’s the honest, technician-level answer—no upsell, just facts.
Quick Answer (Read This First)
If your garage door uses two torsion springs, replacing both garage door springs is usually the smarter, safer, and more cost-effective option. When one spring breaks, the other is typically near the end of its lifespan too. Replacing only one often leads to balance issues—and a second breakdown soon after.
Important: Don’t force the opener or try lifting the door yourself. A door with a broken spring is extremely heavy and unsafe.
Why Garage Doors Have Springs in the First Place
Garage door springs do the heavy lifting. They counterbalance the weight of the door so it can open smoothly and safely. Your opener is designed to guide the door—not lift hundreds of pounds on its own.
When one spring breaks, the system instantly becomes unbalanced. That’s why the door may:
- Open only a few inches and stop
- Feel extremely heavy
- Look crooked or uneven
- Cause cables to appear loose
The Technician Rule of Thumb: Replace Both Springs
From a field perspective, here’s when we almost always recommend replacing both springs:
- Your door has two torsion springs on the same shaft
- Both springs were installed at the same time
- The door is double-wide, insulated, or heavier than average
- The remaining spring shows signs of wear (rust, gaps, noise)
Why? Because springs wear out based on cycle life—how many times the door opens and closes. If one spring has reached the end of its life, the other usually isn’t far behind.
Think of it like tires on the same axle. When one is bald, the other isn’t “new”—it’s just next.
What Happens If You Replace Only One Spring
We see this scenario weekly:
- The door lifts unevenly
- One side carries more weight than the other
- Cables lose proper tension
- The opener works harder than it should
- The second spring breaks weeks or months later
That second visit often costs more than replacing both springs upfront—because you’re paying for labor, diagnostics, and downtime all over again.
When Replacing Just One Spring Can Make Sense
There are a few situations where replacing only the broken spring is reasonable:
- The other spring was replaced recently
- The springs are clearly different ages
- You’re planning a door replacement soon
- Budget is tight and you understand the trade-off
Even then, a professional should always check door balance and confirm the remaining spring is still within safe operating range.
Matching Springs Matters (A Lot)
Garage door springs aren’t interchangeable. Proper replacement means matching:
- Wire size
- Spring length
- Inside diameter
- Wind direction
- Torque required for your door’s weight
When springs aren’t matched correctly, the door won’t behave properly—even if it technically opens. That’s when you see slamming, drifting, or premature wear on cables, drums, and bearings. You can check how to measure a garage door spring as a pro with our blog.
A Word on Safety (Please Don’t Skip This)
Torsion springs are under extreme tension. DIY spring replacement is one of the most dangerous garage door repairs. If cables are loose or the door looks crooked, stop using it and keep the opener unplugged until it’s repaired.
What a Proper Spring Replacement Should Include
A professional spring replacement isn’t just swapping metal parts. It should include:
- Confirming door weight and configuration
- Installing correctly rated springs (standard or high-cycle)
- Full balance test
- Cable and drum inspection
- Hardware check and lubrication
- Opener force and safety test
Final Verdict
If one garage door spring broke, replacing both garage door springs is usually the safest and most reliable solution—especially when they’re the same age. It keeps the door balanced, protects your opener, and helps avoid another breakdown in the near future.
If you’re unsure what setup you have or what makes sense for your door, a quick inspection can save you time, money, and frustration. If you are looking for a garage door spring replacement done by a professional, contact us today.
