Broken garage door spring: signs, risks, and what to do

By Daniel Brooks, Home maintenance writer and appliance troubleshooting specialist based in Charlotte, NC. Reviewed [date — human adds].

Quick answer

A broken garage door spring means the coiled spring above the door (torsion) or alongside the tracks (extension) has snapped or lost tension. The door will feel very heavy, won't stay open, or won't move at all. This is not a repair to attempt yourself.

Broken garage door torsion spring showing a visible gap in the coil.

Why this is not a DIY repair

Torsion springs are wound under extreme tension, storing enough energy to lift a door that can weigh well over a hundred pounds. Handling one without the correct winding bars and training has caused serious injuries, including amputations. This isn't a matter of difficulty or confidence with tools. It's about the stored energy in the spring itself, and that energy doesn't care how many other home repairs you've done.

A licensed technician has the winding bars, the training, and the experience to release and reset that tension safely. This is one of the rare repairs on this site where the honest answer is simply: call a professional.

How to tell if it's actually the spring

A loud bang. Many homeowners hear a sharp bang, sometimes mistaken for a car backfiring or something falling, at the exact moment the spring breaks.
The door won't lift more than a few inches. Without spring tension assisting it, the door becomes far too heavy for the opener or a person to lift normally.
A visible gap in the coil of the torsion spring mounted above the door. A broken one shows a clear separation in the metal.
The door feels dramatically heavier when lifted by hand, even for just a few inches.
A cable that's loose or off the drum, the spool the lifting cable winds around. A broken spring can cause the cable to slacken or slip off it entirely.

A broken spring isn't the only reason a door can feel stuck. If the spring coil looks intact but the door is crooked or grinding rather than just heavy, a door that's come off its track instead is worth ruling out first. And if the spring looks fine and the door simply doesn't respond when you use the opener, it's worth checking why the door won't open at all before assuming a spring problem.

What not to do until it's repaired

Don't use the automatic opener to force the door open or closed. It can damage the opener motor and doesn't fix the actual problem. Don't try to prop the door open manually either, since without spring assistance it isn't stable and can come down without warning. Keep the area under and around the door clear of people, pets, and vehicles. If the door is stuck partway, disconnect the opener using the manual release cord so it isn't fighting against a jammed mechanism, then leave the door as it is until a technician arrives.

What a spring repair typically involves

A technician will generally replace the spring, and often both springs on a two-spring system even if only one broke, since they're installed together and wear at a similar rate. They'll also check the cables and pulleys at the same time, since a snapped spring sometimes stresses those parts too, and they'll test the door's balance afterward to confirm it opens and closes evenly. This is a description of what to expect, not a step-by-step guide. Replacing a spring involves winding bars and specialized technique that fall outside the scope of this site.

When to call a professional

If you've confirmed the spring is broken using the signs above, the answer here is almost always now. There's no safe waiting period once a spring has failed. The door is either stuck in place or dangerously heavy to operate, and every day it sits broken is a day someone in the household could try to force it open.

FAQ

How do I know if my garage door spring is broken?

The clearest sign is a visible gap in the coil of the torsion spring mounted above the door, often paired with a loud bang you may have heard when it happened. The door will also feel much heavier than normal if you try to lift it manually, and it typically won't stay open on its own.

Is it dangerous to replace a garage door spring myself?

Yes. Torsion springs are wound under very high tension, and releasing or winding that tension without the correct winding bars and technique has caused serious injuries. This is one of the few home repairs where professional replacement is strongly recommended regardless of your general DIY experience.

Can I still open my garage door if the spring is broken?

Technically the door can sometimes be lifted manually, but it will be extremely heavy, potentially over 100 pounds without spring assistance, and unsafe to hold in place. Avoid using the automatic opener to force it, since this can damage the motor and doesn't address the underlying issue.

Why do garage door springs break?

Most springs fail from simple metal fatigue after thousands of open-close cycles, which is a normal wear pattern rather than a sign of misuse. Extreme temperature swings and lack of lubrication can shorten a spring's lifespan, but eventual failure is expected with age.

If only one of my two springs broke, do both need replacing?

Most technicians recommend replacing both springs on a two-spring system even if only one failed, since they're installed at the same time and wear at a similar rate. Replacing only the broken one often means the second follows within a relatively short window.