Is It Safe to Fix My Own Garage Door Spring?

Searching for "how to replace a garage door spring" is one of the more dangerous DIY rabbit holes on the internet. We're not saying that to drum up business — we're saying it because we've seen the results when it goes wrong. Here's an honest look at why garage door springs are different from most home repairs.

What Makes Springs Dangerous

Garage door springs store an enormous amount of energy. A typical torsion spring on a residential door is wound to between 7 and 9 full turns of tension and can release that energy almost instantly if it lets go. That energy has to go somewhere — usually into whatever (or whoever) is closest.

Extension springs above the side tracks have the same issue. If they break or if a cable snaps, the spring can fly across the garage at high speed.

Real-World Injuries

The Consumer Product Safety Commission tracks garage-door-related injuries each year. Spring incidents account for a meaningful share — broken fingers, lacerations, fractures, and concussions. Many happen during DIY repairs by people who didn't realize the spring was still under tension after the door was open.

What Actually Goes Wrong With DIY Spring Replacements

• Wrong-size spring. Spring selection isn't just "torsion" or "extension." Diameter, wire gauge, length, and IPPT (inch-pounds per turn) all have to match the door weight. A wrong spring fails fast or hurts the opener.
• Improper winding. Winding bars are specific tools. Using rebar or a screwdriver is a common shortcut that often ends with the bar flying out of the cone.
• Not setting the cable drums correctly. Cables that aren't seated and tensioned properly will jump off the drum the first time the door moves.
• Replacing only one spring of a pair. Door becomes unbalanced, the opener fights it, and the new spring fails early.
• Not checking opener force settings after. A new spring changes the resistance the opener feels. Wrong force settings can damage the door.

What a Professional Spring Replacement Includes

When we replace a spring, the visit covers more than just swapping a part. We:

1. Weigh the door to verify the correct spring rating.
2. Replace both springs together if they're a matched pair.
3. Inspect cables and drums; replace if worn.
4. Reset the spring tension to balance the door (it should hold position at any height).
5. Lubricate the new spring and adjacent components.
6. Adjust opener force and limit settings.
7. Test the safety reverse.

The One Exception

If you have a small overhead-style door with extension springs (common on detached one-car garages built decades ago), and you're an experienced DIYer with the right tools, it can be done. Even then, we'd recommend hiring it out the first time so you can see how it's set up correctly. Torsion-spring doors — the kind on most modern two-car garages — are not a starter DIY project.

When to Call

If you can see a gap in the torsion spring above your door, hear a loud bang followed by a door that won't open, or notice the door hanging at an angle, the safest next step is a phone call (or the form on our home page). We're in Mt Juliet and serve Lebanon, Hermitage, and Donelson.