Garage Door Springs Explained: Why Yours Broke, What It Should Cost, and the Number Nobody Tells You

The spring is the single most misunderstood component on a garage door, and the misunderstanding costs people real money. Two facts explain almost everything about the repair: the spring, not the opener, lifts the door, and springs are rated in cycles rather than years.

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Get those two into your head and the rest of this article — including why a technician wants to replace both, and why one quote is $260 and another is $900 — stops being mysterious.

What the spring is actually doing

A sectional garage door weighs between 150 and 400 pounds. Your opener is typically half a horsepower. It cannot lift that, and it is not asked to. The springs store energy when the door comes down and release it when the door goes up, counterbalancing the weight so precisely that a correctly balanced door can be lifted with one hand.

The opener only overcomes friction and the small residual imbalance. That is why a broken spring turns the door into a dead weight the motor cannot move — and why running the opener against it destroys the gear, the cables and often the top section.

The one test that tells you everything

Pull the release cord, lift the door by hand to waist height and let go.

• Stays put — correctly balanced. This is what you want.
• Sinks — the springs have lost tension. The opener is dragging the difference every single cycle, and it is wearing out early because of it.
• Climbs — over-wound. The door will slam upward when the cord is pulled, which is its own hazard.

That single test predicts more failures than any visual inspection, and almost nobody has ever been shown it.

Torsion or extension — which do you have?

Torsion springs

One or two springs mounted on a steel shaft above the door opening, wound under tension. They are the modern standard because they are safer, control the door better, last longer, and fail more predictably. If you look above your door and see a bar running across with springs wound around it, that is torsion.

Extension springs

Long springs running along the horizontal tracks on each side, stretching as the door closes. Older and cheaper. The critical safety detail is the safety cable — a cable running through the centre of each spring, so that when the spring fails the pieces cannot become projectiles. If you have extension springs and no safety cables, that is worth correcting whatever else you do.

Why yours broke — the honest answer

Not because it was defective, and not because of anything you did. A spring is a fatigue component. Every cycle — one open and one close — puts it through a full loading and unloading, and steel accumulates microscopic damage each time. Eventually a crack propagates and the coil separates. That is the gap you can see.

The number nobody tells you: cycle rating

A standard builder-grade spring is rated for about 10,000 cycles. Translate that into real life:

• 2 cycles a day (occasional use) — roughly 13 years
• 4 cycles a day (garage is the main entrance) — roughly 7 years
• 6 cycles a day (two drivers plus a teenager) — roughly 4 years
• 10 cycles a day (busy household, home business) — under 3 years

Now the useful part. A 25,000-cycle spring costs perhaps sixty to a hundred dollars more per pair and lasts two to three times as long. On any household running four or more cycles a day, that is the best-value decision in this entire repair — and it is almost never offered unless you ask.

What shortens the life further in Naples

Corrosion pits the wire surface, and every pit is a stress concentration where a crack can start. Salt-laden humid air does this continuously. Galvanised or coated springs cost slightly more and are genuinely worth it within a few miles of the water. An unbalanced door, an added insulation kit that was never accounted for, and a door that binds on a seized roller all shorten spring life as well, because they change the load the spring is carrying.

Why both get replaced — and why that is not an upsell

People assume this is the classic padding move. It is not, and the arithmetic is simple. Both springs were installed on the same day, have been through the same number of cycles, and have aged in the same air. When one fails, the other is at the same point in its fatigue life — usually within weeks or months of its own failure.

Replacing one means paying a second call-out shortly afterwards, and running a door that is out of balance in the meantime, which drags on the opener and the cables. On a two-spring door, replacing one also leaves the two springs with different remaining tension, which makes correct balancing impossible.

You are entitled to refuse. Ask for it to be noted on the invoice. But you will very likely see us again.

What it should cost

All of those include winding, balancing and testing. A quote in the $700 to $1,200 range for a residential spring replacement is not a Naples price — the usual pattern is a very low advertised service fee followed by a total that has quadrupled by the time the van leaves. Our full published price list covers the rest of the jobs the same way.

The four numbers that define your spring

This is why “a garage door spring” is not one product:

1. Wire diameter — measured to thousandths of an inch. Two thousandths difference is a different spring.
2. Inside diameter — must match the shaft and the cones.
3. Length — sets the total energy stored.
4. Wind direction — left-hand and right-hand wound, and they are not interchangeable.

Get any one wrong and the door is unbalanced, which wears the opener and the cables and shortens the life of the spring you just paid for. This is also why a technician who measures rather than eyeballs is worth having.

Why this is not a DIY job

A wound torsion spring on a standard double door stores a serious amount of energy. Releasing it without properly fitted winding bars, or with hardware-store rod that flexes, is how people lose fingers and take a bar to the face. The forums that make it look manageable are not lying about the steps — they are quiet about what happens when a bar slips.

There is plenty you can safely do yourself: the balance test, cleaning the sensor lenses, testing both safety reversals, replacing a bottom seal, lubricating hinges and rollers. Anything under spring tension — the springs, the cables, the bottom brackets, the drums — is where this trade earns its living.

What to do the moment a spring breaks

1. Stop pressing the button. Every attempt bends track, tears hinges and burns the opener gear. This single decision often saves several hundred dollars.
2. Unplug the opener so nobody else tries.
3. Do not try to lift the door. With the spring gone you are holding the full weight, and the manual release does not change that.
4. If the car is inside and you need it, call us — that is a routine after-hours job, not a crisis. Our emergency page covers what genuinely warrants a night call and what does not.

The one thing to remember

Ask for the cycle rating before you agree to the repair. If the answer is vague, you are getting standard 10,000-cycle springs, and on a busy household that means you will be paying for this again in three or four years. Sixty extra dollars, asked for at the right moment, is the whole difference.

Frequently asked questions

How long should garage door springs last?

It depends entirely on cycles, not years. A standard 10,000-cycle spring gives about 13 years at two cycles a day, seven years at four, and under three years at ten. Count how often your door actually runs and you have your answer. A 25,000-cycle upgrade costs $60 to $100 more per pair and roughly doubles or triples that.

Why do both springs have to be replaced?

Both were installed the same day, have run the same number of cycles and have aged in the same air, so when one fails the other is at the same point in its fatigue life. Replacing one means a second call-out within months, and on a two-spring door it makes correct balancing impossible because the tensions no longer match.

Can I replace a garage door spring myself?

We would strongly advise against it. A wound torsion spring stores a serious amount of energy, and releasing it without properly fitted winding bars is how people are badly injured. The balance test, sensor cleaning, seal replacement and lubrication are all safe DIY. Anything under spring tension is not.

How much should spring replacement cost in Naples?

$250 to $600 installed for a torsion pair, depending on wire size, door weight and whether you take the higher cycle rating. Extension springs with safety cables run $170 to $350. Quotes in the $700 to $1,200 range are well outside the normal market here.

My door is heavy to lift by hand. Is the spring going?

Almost certainly it has lost tension, yes. Release the door and lift it to waist height: a correctly balanced door stays where you leave it. If it sinks, the opener has been dragging the difference on every cycle, which is why openers on doors like this fail early too.

I added an insulation kit. Do the springs need changing?

Yes, and this is not optional. A retrofit kit can add forty pounds or more, and your springs were sized for the original door weight. Leaving them means an unbalanced door that overloads the springs, the cables and the opener. The springs must be re-checked and usually re-sized.