Short answer: If a loud bang came from the garage and now the door won't open, this guide explains how to confirm it's the spring, why you should not try to replace it yourself, and what a professional repair actually involves.
If a loud bang came from the garage and now the door won't open, this guide explains how to confirm it's the spring, why you should not try to replace it yourself, and what a professional repair actually involves.
How to Tell It's the Spring and Not the Opener
The sound gives it away first. A torsion spring failing usually announces itself with a single loud bang; people often think it was a gunshot or someone breaking in. Afterward the door simply won't open, or the opener strains, lifts an inch, and gives up. To confirm, look at the spring mounted on the horizontal shaft above the door opening. An intact spring is one continuous tight coil; a broken one has an obvious gap where the two halves separated, sometimes several inches wide. Contrast this with an opener problem: if the motor is silent and unresponsive but the door still lifts easily by hand after you pull the release cord, the spring is fine and your issue is electrical. If the door is impossible to lift by hand, the spring, not the opener, is almost always the reason.
Why This Isn't a DIY Job: The Real Danger of Wound Springs
A garage door spring stores an enormous amount of energy; it's the counterweight that makes a door weighing well over a hundred pounds feel light. Torsion springs are wound under high tension, and the winding bars, cones, and set screws involved are exactly where serious injuries happen when someone without the right tools tries to swap one. A slip can send a winding bar or the spring itself flying. On top of the safety issue, springs are sized precisely to your door by wire gauge, inside diameter, and length; guessing wrong leaves you with a door that won't stay down or won't stay up. This is the repair we most strongly urge homeowners not to attempt. The proper tooling and the experience a technician brings turn a genuinely hazardous job into a short, controlled visit.
What a Pro Does to Replace It, and What to Expect
A technician starts by confirming the spring type and measuring it, then safely unwinds any remaining tension with proper winding bars before removing the old spring. Good practice is to replace springs in matched pairs when your door has two, because if one has reached the end of its cycle life the other is close behind, and doing both saves you a second service call within months. They'll also inspect the cables, drums, and bearings while everything is apart, since a spring that ran to failure often stressed those parts too. As for cost, single-spring replacement typically runs in the low-to-mid hundreds and a two-spring job somewhat more, depending on spring size and door weight; ask for the price to be confirmed against your actual door before any work begins. Most spring replacements are completed same-day.
Frequently Asked Questions
How to Tell It's the Spring and Not the Opener?
The sound gives it away first. A torsion spring failing usually announces itself with a single loud bang; people often think it was a gunshot or someone breaking in. Afterward the door simply won't open, or the opener strains, lifts an inch, and gives up. To confirm, look at the spring mounted on the horizontal shaft above the door opening. An intact spring is one continuous tight coil; a broken one has an obvious gap where the two halves separated, sometimes several inches wide. Contrast this with an opener problem: if the motor is silent and unresponsive but the door still lifts easily by hand after you pull the release cord, the spring is fine and your issue is electrical. If the door is impossible to lift by hand, the spring, not the opener, is almost always the reason.
Why This Isn't a DIY Job: The Real Danger of Wound Springs?
A garage door spring stores an enormous amount of energy; it's the counterweight that makes a door weighing well over a hundred pounds feel light. Torsion springs are wound under high tension, and the winding bars, cones, and set screws involved are exactly where serious injuries happen when someone without the right tools tries to swap one. A slip can send a winding bar or the spring itself flying. On top of the safety issue, springs are sized precisely to your door by wire gauge, inside diameter, and length; guessing wrong leaves you with a door that won't stay down or won't stay up. This is the repair we most strongly urge homeowners not to attempt. The proper tooling and the experience a technician brings turn a genuinely hazardous job into a short, controlled visit.
What a Pro Does to Replace It, and What to Expect?
A technician starts by confirming the spring type and measuring it, then safely unwinds any remaining tension with proper winding bars before removing the old spring. Good practice is to replace springs in matched pairs when your door has two, because if one has reached the end of its cycle life the other is close behind, and doing both saves you a second service call within months. They'll also inspect the cables, drums, and bearings while everything is apart, since a spring that ran to failure often stressed those parts too. As for cost, single-spring replacement typically runs in the low-to-mid hundreds and a two-spring job somewhat more, depending on spring size and door weight; ask for the price to be confirmed against your actual door before any work begins. Most spring replacements are completed same-day.
How do I get help with this?
Call (408) 906-0446 and describe the situation, your exact location, and what you need. Timing is confirmed on that call rather than promised in advance.
Call for help: (408) 906-0446 — a straight answer and an honest estimate before any work begins.