The bang and the broken spring: why this is not a job to try yourself

What it sounds like and looks like

The event has a recognizable shape. There is a loud bang from the garage. Afterward the opener hums or strains and the door does not rise. Or it rises a few inches and stops, or will not stay up. A door that lifts only partway, hangs crooked, or feels far heavier than it did yesterday points to a spring that no longer carries its share of the weight. If you can see a gap in a spring coil, look at it from the floor and from a distance, and leave the door alone.

A bang can mean a spring, but we have no figure for how often it does, so we do not say it usually does. A bang plus a door that will not lift is how a broken spring presents, and the right response does not depend on being certain.

What a spring does

A garage door is heavy. Springs counterbalance that weight so that a person, or a small motor, can raise it. DASMA says that if a door is heavy or needs two hands to lift, it is probably out of balance, and that “the answer is not a more powerful garage door opener.”

There are two arrangements. A torsion system uses a spring wound on a shaft above the door opening, and cables run from drums on that shaft to brackets at the bottom corners. An extension system uses a pair of springs that stretch along the horizontal tracks on each side, with cables and pulleys. The difference matters to a technician more than to you. Both store a lot of energy in a spring, and both hold it through cables and brackets that share the load.

What the safety sources say

The federal rule for residential door openers, 16 CFR 1211, requires owner and installation instructions that include the words: “Have a qualified service person make repairs to cables, spring assemblies and other hardware.” The same instructions warn that “Weak or broken springs may allow the door to fall rapidly, causing injury or death.”

DASMA is blunt. Its safety page says: “Your garage door’s springs are arguably the most important and most dangerous part of your door.” It says spring systems “are dangerous and should be repaired only by trained professionals,” and it adds that older doors should have their springs inspected by a professional technician.

This page prints no injury or death statistics. The wording above comes from the rule and the trade association themselves, and it is enough.

Replace both springs

If your door has two springs and one breaks, DASMA says to replace both, even if the other is not broken. Its reason is to prevent damage when the second one breaks and to keep the door working efficiently. When you compare quotes, check that the quote says how many springs it covers. A cheap quote for one spring on a two-spring door answers a narrower question than a quote for both.

Extension springs and the safety cable

DASMA says an extension spring needs a safety cable run through it and secured to the wall or ceiling at each end. With the door down the spring is under high tension and a break may cause injury, so the cable is there to contain it. If the company is working on an extension system, ask whether the safety cables are in place, and whether it will add them where they are missing. That is a question about equipment, and you can see the answer yourself from the floor.

Cables and bottom brackets

The spring is not the only part under load. DASMA says to inspect cables visually down to the bottom brackets, that frayed or worn cables can break and cause injury, and that “due to the dangers associated with high spring tension, these cables should be replaced only by a trained technician.” It says the bottom brackets are connected to the springs and under extreme tension, and “should be adjusted or loosened only by a trained door systems technician.” A door that sits low on one side, or a cable that hangs loose, belongs in the same category. See cable repair.

Why this is not a DIY job

The spring stores energy, the cables and brackets hold it, the door’s own weight falls if any of them lets go, and two separate authorities tell homeowners to leave it to people trained to do it. We give no odds of being hurt. What we can say is that DASMA and the federal rule both direct the work to trained people.

Verdict: pro job. What you can safely do is keep people, pets and vehicles away from the door, leave it closed if it is closed, and not use the opener against a door that will not move. Do not try to lift it. If a car or person is trapped, call emergency services first.

Winter and lubrication

DASMA’s technical sheet on climate says doors in places with extreme heat or cold and frequent precipitation should be kept closed where possible, and that lubrication per the manufacturer’s instructions helps spring life. We found no Michigan source that says cold weather breaks springs sooner, so we do not claim it. DASMA also recommends monthly safety checks and an annual visit from a trained door systems technician.

What to ask the company

Before anyone starts, get the price in writing and find out what the call-out fee covers. The quote should say whether it covers both springs, the cables and the bottom brackets, and whether a safety cable is fitted on an extension system. Also ask who will do the work on your door. Afterward, have the technician test the door’s balance and run the opener’s reversal test; the reversal test guide explains it.

If you phone in an emergency and the company asks you to sign a statement describing the emergency and waiving a cancellation right, that is the exception Michigan’s home solicitation act allows, and it has to be separate, dated, handwritten and signed. LARA’s payment advice still applies: never pay for the entire job in advance, and pay by check to the company name.

Price and the calculator

The service page shows our estimate for the job, $155 to $330 per job, both springs, a model and not a quote, and the wage evidence behind it: Michigan mechanical door repairers, the nearest BLS code, had a median wage of $25.18 an hour in May 2025, read through O*NET OnLine. That is pay, not price. To see how a spring’s rated cycles relate to how often your door runs, the spring life calculator does the arithmetic and makes no prediction. For the job itself, see spring replacement and emergency garage door.