Fix Garage Door Spring: Complete Guide for Homeowners

A garage door spring stores an enormous amount of energy, enough to lift a 150-pound door, and that same energy is what makes a broken one dangerous to handle. If your door suddenly feels impossibly heavy, will not open, or you heard a loud bang like a gunshot from the garage, you almost certainly need to fix a garage door spring. Before you grab a wrench, understand this: torsion spring work sends people to the emergency room every year, and it is one of the few home repairs where I genuinely urge caution. This guide explains how to fix a garage door spring safely, what you can do yourself, and where the line is that you should not cross.

Part of our Garage Doors guide — explore the full guide →

Understanding the Two Spring Types Before You Fix a Garage Door Spring

You cannot repair what you cannot identify, so the first step is knowing which system you have. Residential garage doors use one of two spring types, and they behave very differently.

• Torsion springs: mounted horizontally on a metal shaft above the door opening. They twist to store energy and are the more common, safer, and longer-lasting design.
• Extension springs: run parallel to the horizontal tracks on each side of the door. They stretch and contract to counterbalance the door.

Torsion springs typically last 10,000 to 20,000 cycles, roughly 7 to 12 years of normal use, before they fatigue and snap. Extension springs are common on older or lighter doors. Look above your door: a shaft with springs wound around it means torsion; long springs stretched along the tracks mean extension. This tells you what parts to buy and how risky the job is.

Signs Your Spring Has Failed

Diagnosing the problem correctly saves you from replacing the wrong part. A failed spring shows clear symptoms, and confusing them with an opener issue is common.

• A visible gap in the torsion spring coil, since it usually snaps cleanly
• The door will not open with the opener, or the opener strains and stops
• The door is extremely heavy to lift by hand when disconnected from the opener
• A loud bang heard earlier, the sound of the spring breaking
• The door opens a few inches then stops or falls

Test it safely: pull the red emergency release cord to disconnect the opener, then try to lift the door by hand. A door with good springs should rise smoothly and stay put halfway. If it slams down or feels like dead weight, the spring is the problem, not the opener.

The Critical Safety Warning

I have to be blunt here because it matters. A wound torsion spring holds tremendous stored energy, and if a winding bar slips or a spring lets go while you are working, it can break bones, remove fingers, or worse. This is the single most dangerous common garage task.

For torsion springs specifically, unless you have the correct winding bars, understand the winding process precisely, and are confident, hire a professional. It is not worth an injury to save a couple hundred dollars. Never use screwdrivers or rebar as winding bars, never put your face in the path of the spring, and never work on a spring under tension without the proper tools. If you are the least bit unsure, stop and call a pro.

Replacing an Extension Spring (Homeowner-Friendly)

Extension springs are the more DIY-approachable of the two, because you can relieve their tension safely by opening the door. When the door is fully open, the extension springs are relaxed, which makes the job manageable for a careful homeowner.

1. Open the door fully and clamp locking pliers on the track just below the bottom roller so the door cannot move.
2. Disconnect the opener with the red release cord.
3. With the spring now slack, unhook the safety cable and detach the old spring from the track hanger and the pulley.
4. Install the matching new spring, reconnecting it in the same configuration, and rethread the safety cable, which is essential to contain a future break.
5. Remove the clamps, reconnect the opener, and test the balance by hand.

Always replace springs in pairs even if only one broke, because the second is near the end of its life and matched springs keep the door balanced. Never omit the safety cables on extension springs; they are what stop a snapped spring from flying across the garage.

What Torsion Spring Replacement Involves

Even if you decide to hire out torsion work, knowing the process helps you understand the quote. A pro will measure the existing spring’s wire diameter, inside diameter, and length to order an exact match, since these determine the counterbalance force.

They then clamp the door, unwind the old spring with winding bars, slide it off the torsion shaft, install the new spring, and carefully wind it to the correct number of turns, typically around 7.5 to 8 turns for a standard 7-foot door but always to spec. Finally they check the balance and adjust. The winding step is precisely where the danger lives, which is why it commands a professional’s tools and experience.

Costs and When to Call a Pro

Knowing the numbers helps you decide. The springs themselves are inexpensive; the labor and risk are what you pay for.

• Torsion spring parts: $30 to $100 per spring
• Extension spring parts: $15 to $50 per spring
• Professional replacement: $200 to $350 for a pair installed, including labor and a service call
• Winding bars set: $15 to $30 if you DIY extension work

My honest recommendation: extension springs with the door safely open are a reasonable DIY job for a careful, mechanically inclined homeowner who installs the safety cables. Torsion springs are best left to a professional unless you are experienced and properly equipped. Given that a pro often finishes a torsion job in under an hour with the right tools and warranties the work, the modest cost buys real peace of mind. Whichever route you take, replace springs in pairs, match the specs exactly, and never underestimate the energy stored in that innocent-looking coil.

How to Read Your Spring Specs Before Ordering

Ordering the correct replacement is half the battle, and torsion springs in particular must match four measurements exactly or the door will be unbalanced. Whether you DIY or hand the specs to a supplier, know how these are read. Getting even one wrong means a door that flies open or refuses to lift.

• Wire diameter: measure across 10 or 20 coils and divide; typical residential wire is 0.207 to 0.250 inches
• Inside diameter: the ID of the coil, commonly 1.75 or 2.0 inches, often stamped or color-coded on the cone
• Length: the relaxed length of the spring in inches
• Wind direction: left-wound and right-wound springs are paired; a two-spring door uses one of each

The wind direction is color-coded on the stationary cone, black for right-wound and red for left-wound on many springs. Measure the broken spring precisely or take it to a supplier who can match it. If you cannot get accurate measurements, a professional will size it correctly from the door’s weight and height, which is another reason many homeowners hand off torsion work.

Maintenance That Extends Spring Life

Springs wear by cycles, not just years, so a little care stretches their lifespan and gives you warning before a failure. The single best habit is lubricating the springs and moving parts a couple of times a year with a garage-door-specific lubricant, not WD-40, which is a cleaner rather than a lubricant.

Spray a light coat of white lithium or silicone-based garage door lube along the torsion spring coils, the rollers, the hinges, and the bearings. This reduces friction and metal fatigue. Twice a year, run the balance test by disconnecting the opener and lifting the door halfway; if it holds, the springs are healthy, and if it drifts, they are wearing. Keep the tracks clean and the door itself in good repair, since a binding door strains the springs. If your door cycles many times a day, consider higher-cycle springs rated for 20,000 or more cycles when you replace, which cost a little more but last far longer. These small steps will not make a spring immortal, but they push the failure years down the road and give you a heads-up before you are stranded with a door that will not open.

One last piece of practical advice: when a spring breaks, resist the urge to force the door open with the opener. The opener motor is designed to move a counterbalanced door, not to lift the full dead weight on its own, and running it against a failed spring can strip the opener gears or burn out the motor, turning a $200 spring job into a $200 spring plus a new opener. Instead, pull the emergency release, and if you must get a car out, get a helper and lift the door together carefully, propping it with locking pliers on the track. Better yet, park elsewhere and wait for the repair. Springs almost always fail with little warning, so the real protection is the maintenance and balance checks that let you catch a tired spring and schedule replacement on your terms rather than discovering it the morning you are already late for work.