Broken Garage Door Spring? What to Do Next (and What Not to Do)

You pressed the opener, heard the motor strain, and the door barely moved. Or maybe you heard a sharp bang from the garage last night, like something heavy hit the floor. In most homes around Oshawa and the rest of Durham Region, that combination points to one thing: a broken garage door spring.

It's one of the most common garage door repairs we see, and it's also one of the most misunderstood. This guide explains how to tell if a spring has failed, why you shouldn't try to fix it yourself, and what a proper repair looks like.

How garage door springs work

A typical residential sectional door weighs well over 100 pounds, and a double door can weigh a lot more. The opener isn't designed to lift all that weight on its own. The springs do the heavy lifting by storing energy when the door closes and releasing it when the door opens. A balanced door should feel almost weightless when you lift it by hand.

Most homes use one of two systems:

• Torsion springs sit on a metal shaft above the door opening. They twist to store energy. Most newer homes in Durham Region use torsion springs.
• Extension springs run along the horizontal tracks on each side of the door and stretch to store energy. They're more common on older or lighter doors.

Every spring is rated for a certain number of open-and-close cycles. Industry-standard springs are commonly rated for around 10,000 cycles, which works out to several years for a household that uses the door a few times a day. Cold Ontario winters, rust, and poor balance can shorten that life.

Signs your garage door spring is broken

You don't need to climb a ladder to spot the most common symptoms:

1. A loud bang from the garage with no obvious cause. A torsion spring releasing its tension is surprisingly loud.
2. A visible gap in the spring on the shaft above the door, usually a two-inch or so separation in the coil.
3. The door lifts a few inches and stops, or the opener hums while the door stays put. Many openers have a safety feature that stops the motor when the load is too heavy.
4. The door feels extremely heavy when you try to lift it manually.
5. The door closes fast or unevenly, sometimes slamming the last few feet.
6. Loose or dangling cables beside the door. When a spring fails, the lift cables often lose tension and jump off their drums.

Why you shouldn't replace a spring yourself

We understand the temptation. Online videos make it look like a 30-minute job. But spring replacement is the one garage door repair we always tell homeowners to leave alone, for a few reasons:

• Stored energy. A wound torsion spring holds enough force to break bones or cause serious head injuries if a winding bar slips.
• Specialized tools. Proper winding bars, clamps, and the correct replacement spring (matched by wire size, length, and inside diameter to your door's weight) are all required.
• Balance matters. A spring that's even slightly wrong for your door will make the opener work harder, wear out rollers and cables faster, and can cause the door to drift or slam.
• Cables and drums are often involved. A spring failure can knock cables off their drums or fray them, and those need to be reset correctly under tension.

What to do right now

If your spring has just broken, here's how to handle the next few hours safely:

1. Leave the door where it is if it's closed. A closed door with a broken spring is secure and stable.
2. Unplug the opener so nobody in the house accidentally presses the remote or wall button.
3. Don't pull the red emergency release while the door is open. Without spring tension, the door can drop suddenly.
4. Move your car only if the door is already open and stable. If it's stuck partly open, keep people and pets clear of it.
5. Call a technician and describe what you heard and saw. Mention whether the door is open or closed and whether cables are hanging loose.

What a professional spring repair involves

A proper spring repair is more than swapping one coil for another. When we replace springs for homeowners across Oshawa, Whitby, and Courtice, the visit typically includes:

• Measuring and matching the correct spring for your door's weight and height rather than guessing.
• Replacing springs in pairs on doors that use two. If one has reached the end of its life, the other usually isn't far behind, and matched springs keep the door balanced.
• Inspecting cables, drums, bearings, and rollers for damage caused when the spring let go.
• Balancing the door so it stays put when lifted halfway by hand.
• Testing the opener and safety sensors so the whole system works together.

That last step matters. A spring replacement is the perfect moment to catch worn rollers, a frayed cable, or an opener that's been struggling for months. Our garage door spring repair service always ends with a full safety inspection and balance test, and anything else we spot, from rollers to the opener, is covered by our garage door repair service.

Can you make springs last longer?

Springs will eventually wear out, but you can help them reach their full lifespan:

• Lubricate the springs lightly a couple of times a year with a garage-door-rated lubricant (not grease).
• Watch the balance. Once or twice a year, disconnect the opener and lift the door halfway. If it slides up or down on its own, the springs are losing tension.
• Keep the door moving smoothly. Worn rollers and dry hinges make the whole system work harder.
• Ask about higher-cycle springs when yours are replaced. If your household uses the garage as the main entrance, a longer-life spring can make sense.

Our garage door maintenance checklist for Ontario winters walks through these steps in more detail.

Frequently asked questions