Broken Garage Door Spring: Signs, Dangers & What to Do

Your garage door weighs a lot more than it feels like, often between 150 and 350 pounds. The springs are what counterbalance that weight so the opener, or your arm, can lift it easily. When a spring breaks, all of that weight is suddenly working against you. A broken spring is the most common major garage door failure we see, and it is also the one people most often try to muscle through, which is exactly what you should not do.

How to tell your spring is broken

• You heard a loud bang. A breaking torsion spring releases a lot of energy at once and makes a sound like a firecracker or a heavy metal snap. Many people think something fell in the garage.
• The door will not lift, or feels extremely heavy. With a broken spring, the opener cannot raise the door, and by hand it feels like dead weight.
• There is a visible gap in the spring. Look at the coiled spring on the bar above the door. A two-inch gap where the coil separated is a dead giveaway.
• The opener lifts the door a few inches and stops. It senses the weight and gives up, sometimes with a strained hum.
• The door looks crooked or the top section bends. One corner lifting before the other means the door is fighting the missing spring.

Torsion vs extension springs

There are two common systems. Torsion springs mount on a metal bar above the door and are the more modern, safer, longer-lasting design. Extension springs run along the horizontal tracks on each side and stretch as the door closes. Both wear out, and both are dangerous to service without the right tools. A technician will confirm which you have and match the correct size and rating.

Why a broken spring is dangerous

Torsion springs are wound under enormous tension. Releasing or winding one without the proper winding bars and technique is how people break fingers and injure their faces and eyes. The springs also have to be sized to your specific door weight. Too weak and the door will not stay up, too strong and it slams and wears the opener. This is why spring replacement is a job worth leaving to a pro who does it every day.

What to do right now

1. Stop operating the door and unplug the opener so no one runs it by accident.
2. Do not pull the emergency release with the door open. If the spring is broken, the door can drop.
3. If a car is trapped and you must move the door, get help and lift together only if the door is already closed. When in doubt, wait for a technician.
4. Call for a same-day replacement.

How a professional fixes it, and what to expect

A technician confirms the spring type, measures the wire size, inside diameter, and length, and installs the correctly rated replacement. On a two-spring door we recommend replacing both since they age together. We also offer high-cycle springs that last significantly longer for busy households. If you want to know what drives the number on the invoice, see what spring replacement costs in King County. Most replacements take under an hour, and you get an upfront written price first. See full details on our spring replacement page, or if other parts are involved, our garage door repair service. We replace springs same-day across Seattle, Renton, Kent, and the wider Eastside.

Frequently asked questions

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

The clearest signs are a loud bang from the garage, a door that will not lift or feels extremely heavy by hand, and a visible gap of a couple of inches in the coiled spring above the door. The opener may also strain, lift the door an inch, and stop. If you see any of these, stop using the door.

Can I replace a garage door spring myself?

We strongly recommend against it. Torsion springs are wound under extreme tension and can cause serious hand, face, and eye injuries if they release suddenly. The right winding bars, correctly sized springs, and technique matter. A professional replacement is fast, safe, and warrantied.

Should I replace one spring or both?

If your door has two springs and one broke, replacing both is almost always the better choice. They wear at the same rate, so the second is likely close behind. Replacing the pair saves you a second service call and keeps the door balanced.

How long does a spring replacement take and is it warrantied?

Most spring replacements are done in under an hour. We carry commercial-grade springs on the truck, offer high-cycle upgrades that last longer, and back the work with a written warranty. You get an upfront price before we start.