How to Fix a Broken Garage Door Spring: Torsion and Extension Spring Replacement Guide

Frequently Asked Questions

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

A broken garage door spring is usually obvious: you'll hear a loud bang from the garage (often described as a gunshot), and the door will become very heavy and refuse to open more than a few inches. With a torsion spring (mounted horizontally above the door), look for a visible gap in the coil. With extension springs (mounted along the side tracks), look for a spring that's hanging loose or stretched out of position.

Is it safe to replace a garage door spring myself?

Extension springs can be replaced by a careful DIYer with the right safety precautions. Torsion springs are a different matter — they store enormous energy under tension (enough to cause serious injury or death if released suddenly) and should be replaced by a professional unless you have specific training and the correct winding bars. Never attempt to wind or unwind a torsion spring with a screwdriver or improvised tool.

How much does it cost to replace a garage door spring?

DIY extension spring replacement costs $15–$40 for parts. Professional spring replacement costs $150–$350 for a single spring or $200–$500 for both springs (torsion springs are typically replaced in pairs). A professional has the tools, experience, and insurance to handle torsion springs safely — the labor cost is worth it for most homeowners.

Why did my garage door spring break?

Garage door springs are rated for a certain number of cycles (open/close operations) — typically 10,000 cycles for standard springs, or 20,000–100,000 for high-cycle springs. At two cycles per day, a 10,000-cycle spring lasts about 14 years. Springs also break prematurely due to: lack of lubrication, rust and corrosion, temperature extremes, and imbalanced door weight. Cold winters are especially hard on springs because metal contracts and becomes more brittle.

Should I replace both springs even if only one is broken?

Yes — always replace both springs at the same time. If one spring has reached the end of its life cycle, the other is close behind. Replacing both now saves you from a second service call in a few months. It also keeps the door balanced, since mismatched springs put uneven stress on the opener motor, cables, and tracks.

Can I open my garage door manually with a broken spring?

You can, but it requires two people and extreme caution. Disconnect the opener by pulling the red emergency release cord. With a helper, manually lift the door from both sides simultaneously. A standard garage door weighs 130–350 pounds — without spring counterbalance, it requires significant force to lift and will drop immediately when released. Do not leave the door propped open. If you must get your car out, get help and work carefully.

Garage door spring replacement: This is the most dangerous DIY garage door repair. Torsion springs are under extreme tension and can cause serious injury if mishandled.

A broken garage door spring is one of those home repairs that announces itself dramatically — a loud bang from the garage, then a door that won’t budge. It’s one of the most common garage door problems, and understanding how springs work helps you respond safely and get the door operational again.

This guide covers both torsion and extension spring systems, explains the real safety risks of torsion spring replacement, and walks you through extension spring replacement as a DIY project.

What You Need

Before starting any work, make sure you have the right parts and safety gear. Buying the wrong spring size is the most common DIY mistake — measure carefully before ordering.

• Garage door extension springs replacement pair ($15–$35 for a matched pair rated for your door weight)
• Garage door lubricant spray ($8–$12, use on all moving parts after replacement)
• C-clamps or locking pliers ($10–$20 to secure the door in place during work)
• Safety cables for extension springs ($10–$20 for a pair — these are essential safety hardware)
• Winding bars for torsion springs ($15–$25 — only needed for torsion spring work by trained individuals)
• Digital fish scale or spring tension gauge ($15–$30 to verify balanced tension after installation)

You’ll also need a ladder, wrenches, and a tape measure. Safety glasses and gloves are mandatory.

Understanding the Two Types of Garage Door Springs

Torsion Springs are mounted horizontally on a metal shaft directly above the closed garage door, typically inside a tube or mounted on a bracket. When you open the door, the springs unwind and store energy; when you close it, they wind back up. Torsion springs are under enormous tension — a single standard torsion spring stores enough energy to cause a serious fracture or laceration if it releases suddenly. Most modern attached garages use torsion springs.

Extension Springs run along the horizontal tracks on both sides of the door. They stretch and extend as the door closes, storing energy like a rubber band. When the door opens, the springs contract and help lift the door. Extension springs are less dangerous than torsion springs but still require respect — a snapped spring under tension can act like a projectile. Extension springs must always be installed with safety cables threaded through them (most newer installations have these).

Which do you have? If you see a single spring (or two springs) mounted on a horizontal bar above the center of the door — that’s a torsion system. If you see springs running along the sides of the door parallel to the ceiling tracks — those are extension springs.

Safety Rules Before You Touch Anything

These rules are non-negotiable:

1. Disconnect the electric opener. Unplug it from the ceiling outlet or trip the circuit breaker. You don’t want the door to activate while you’re working.

2. Clamp the door in place. Use C-clamps or locking pliers on the vertical track just below the bottom roller on each side. This prevents the door from moving unexpectedly if you accidentally release tension.

3. Wear safety glasses and gloves. Springs can snap and send metal fragments flying.

4. Never use a screwdriver or improvised tool as a winding bar on a torsion spring. The cone winding end on a torsion spring will strip, snap, and release catastrophically. Only use proper hardened steel winding bars that fit the exact winding cone size.

5. If in doubt, call a pro. Torsion spring replacement is a job where a $200 service call is genuinely worth the money. An ER visit costs far more.

Torsion Spring Replacement: Why This Is a Pro Job

Torsion springs for a typical two-car garage door are wound to 30 or more quarter-turns of tension. To release and re-tension them, you insert winding bars into holes in the spring’s winding cone and unwind/rewind carefully — a process where a slip or an improperly fitted bar can send the bar flying at your face with significant force, or cause the spring to unwind violently.

Professional garage door technicians do this dozens of times per week with proper tools and technique. They also know the correct spring specifications — spring diameter, wire size, and winding direction all must match your door’s exact weight and configuration.

What you can safely do for a broken torsion spring:

• Confirm the spring is broken (look for the gap in the coil)
• Measure the spring dimensions and order the correct replacement (wire diameter, inside diameter, length, and winding direction)
• Prepare the workspace and gather tools so the technician can work efficiently
• Replace the spring yourself only if you have completed hands-on training — not just watched YouTube videos

Finding a torsion spring technician: Most garage door companies offer same-day or next-day emergency spring replacement. Call 2–3 companies for quotes. Expect $150–$350 for torsion spring replacement, and pay the extra cost to replace both springs at once.

Extension Spring Replacement: Step-by-Step DIY

Extension spring replacement is within reach for a careful DIYer. The springs have much less stored energy than torsion springs, and the replacement process doesn’t require specialized tools.

Step 1: Buy the right springs. Extension springs are sold by weight capacity and length. Check the label on your existing spring if possible — it should show the door weight rating. If the label is gone, measure the spring’s length (fully relaxed) and wire diameter, and note whether your door is a standard 7-foot door or 8-foot door. Standard residential extension springs are typically rated for 100–200 lbs per spring. When in doubt, buy springs rated for slightly more weight than your door.

Step 2: Secure the door in the down position. Close the door completely. Clamp locking pliers or C-clamps on both vertical tracks just above the bottom rollers. This locks the door in place and keeps the cables at the correct position while you work.

Step 3: Disconnect the opener. Unplug the electric opener from its ceiling outlet.

Step 4: Relieve tension on the broken spring. If the spring is completely broken, there may be minimal tension remaining. If you’re replacing a worn (but not yet broken) spring, you’ll need to relieve tension first by opening the door to the fully open position and clamping it there — this relaxes the extension springs.

Step 5: Remove the old spring. Extension springs connect at one end to a bolt or pulley near the front of the track and at the other end to a cable attached to the door. The spring runs through a safety cable. Unhook the spring from both ends. Remove the safety cable from the old spring and set it aside — you’ll reuse it or replace it with new safety cables.

Step 6: Install the new spring. Thread the safety cable through the new spring before installation. Hook one end of the spring to the rear anchor bracket (usually a bolt or S-hook at the back of the track). Stretch the spring to the front of the door and hook the other end to the cable pulley bracket or front track bracket. Confirm the safety cable is properly threaded through the spring and anchored at both ends.

Repeat on the other side. Replace both springs even if only one has failed.

Step 7: Reconnect the opener and test. Remove the clamps from the tracks. Plug the opener back in. Use the wall button to open and close the door several times. Watch the door travel — it should move smoothly and evenly without jerking or sagging on one side. If one side droops, the spring tension is uneven and you may need a different spring rating.

Step 8: Test the door balance. Disconnect the opener by pulling the red emergency cord. Manually lift the door to waist height and release it gently. A properly balanced door will stay in place (or drift very slowly). A door that slams down or shoots up has unbalanced springs. A balanced door is critical for opener longevity — an unbalanced door forces the opener motor to compensate, shortening its life.

After Replacement: Maintenance

Lubricate the springs. Apply a light coat of garage door lubricant spray to the spring coils. Don’t use WD-40 — it evaporates quickly and leaves residue that attracts dirt. Use a dedicated garage door lubricant or white lithium grease.

Lubricate the rollers, hinges, and tracks while you have everything open and accessible. This takes 5 minutes and dramatically extends hardware life.

Check the safety cables (extension springs only). The cables should be taut and run straight through the center of the spring. Any fraying, kinking, or slack means they need immediate replacement.

Set a calendar reminder to lubricate. Lubricate garage door hardware twice a year — spring and fall. Cold weather in particular is tough on unlubricated springs.

When to Call a Professional

Call a garage door company if:

• You have torsion springs (unless you have specific hands-on training)
• You’re unsure of the correct spring specifications for your door
• The door cables are frayed or have jumped off the drum or pulley
• The door tracks are bent or misaligned
• The opener carriage assembly is damaged
• The door panels themselves are cracked or bent

A professional garage door technician can assess the full system, replace springs correctly, and adjust cable tension and track alignment in a single visit. Most companies charge a flat service fee of $50–$100 plus parts.

Cost Summary

Repair	DIY Cost	Pro Cost
Extension spring pair	$15–$35	$150–$275
Torsion spring (single)	$25–$60 (parts)	$150–$300
Torsion spring (both)	$50–$100 (parts)	$200–$400
Full spring + cable service	$75–$150 (parts)	$250–$500

The lifespan difference between standard springs (10,000 cycles) and high-cycle springs (25,000–100,000 cycles) is significant. When you’re having a professional replace your springs, ask about upgrading to high-cycle springs — the additional cost is usually $50–$100 per spring and can double or triple the spring’s life.

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