Torsion vs Extension Springs: Which Do You Have, and When Should Both Be Replaced?

Direct Answer: What Is the Difference Between Torsion and Extension Springs?

A garage door uses one of two spring systems. Torsion springs are mounted on a metal shaft directly above the door and store energy by twisting; extension springs run along the horizontal tracks on each side of the door and store energy by stretching. Both do the same job: they counterbalance the weight of the door so it can be lifted and lowered safely. A typical residential door weighs well over a hundred pounds, and the opener is only designed to move a door that is already balanced — it is the springs that do the real lifting.

Knowing which system you have matters because the two systems wear out differently, give different warning signs, and are handled differently by a technician. It also matters at replacement time: when one spring on a paired system fails, the other spring has lived the same life and is usually not far behind. That is why technicians so often recommend replacing both springs in one visit.

Springs store a great deal of tension, and work on them is technician work only. No part of this guide is a winding or tensioning instruction — do not try to adjust, wind, or replace a spring yourself.

How to Tell Which Spring System Your Door Uses

You can identify your spring type from inside the garage, looking at the door while it is closed. You do not need to touch anything — just look.

• You have torsion springs if there is a metal shaft running horizontally right above the closed door, with one or two thick coils mounted on it. The springs twist on that shaft as the door opens and closes. Most doors built in the last twenty years use a single or double torsion system.
• You have extension springs if you see long, thin coils running parallel to the horizontal tracks, one on each side of the garage above your head. They stretch and contract as the door moves. You will often see a pulley and cable alongside each spring.

A few older or unusual doors use other arrangements — a Wayne Dalton Torquemaster-style enclosed system, for example — but the shaft-above-the-door vs springs-on-the-sides rule covers the vast majority of residential doors.

Feature	Torsion springs	Extension springs
Location	Shaft mounted above the door	Along the horizontal tracks, both sides
How they work	Twist to store energy	Stretch to store energy
Breakage behaviour	Spring stays on the shaft; door becomes very heavy	Spring can recoil or drop; safety cables contain the pieces
Typical cycle life	About 10,000 cycles (roughly 7–10 years of average use)	Similar rating, but often wears unevenly side to side
Best suited to	Heavier, wider, and well-insulated doors	Lighter, narrower doors; often on older installations
Upgrade path	Already the modern standard	Many doors can be converted to torsion by a technician

Modern installations almost always use torsion springs because they lift more evenly, keep both sides of the door balanced, and last longer in practice. If your older door has extension springs and they are nearing the end of their life, ask the technician whether converting to a torsion system makes sense for your door — the springs cost more, but you get a smoother, longer-lived system. Some doors with limited headroom use low-headroom torsion hardware, so a tight space does not automatically rule torsion out.

Signs Your Garage Door Spring Is Failing

Springs rarely fail with no warning. Watch for these signs — each is a reason to call before the spring lets go completely:

• The door feels heavy or hard to lift by hand. Springs do the lifting; when they weaken, the full weight of the door returns.
• The door opens unevenly or tilts to one side. On extension-spring doors, one spring often weakens faster than the other, racking the door in the opening.
• A loud bang or snap from the garage. That is the classic sound of a torsion spring breaking. The door will then open only a few inches, if at all.
• A visible gap in the coil. On a torsion spring, a break shows as a clear gap between coil sections on the shaft. On an extension spring, look for a stretched-out section or a coil that no longer sits tight.
• The door stops mid-travel or reverses. The opener strains against a door it was never designed to lift alone.
• The opener sounds strained or the door moves more slowly than it used to. A labouring opener is often a spring problem, not an opener problem.
• The door will not stay halfway open. A balanced door, lifted by hand with the opener disconnected, stays roughly where you put it. A door that slams down or shoots up has a spring-balance problem.

The last point deserves care: do not disconnect your opener and test the door by hand if you already suspect a broken spring. A door with no spring support can weigh hundreds of pounds and can fall without warning. When a technician visits, the balance check is part of their inspection, done with the right procedure and equipment.

Replace One Spring or Both?

This is the most common question at a spring visit, and the answer is almost always the same: replace both.

Situation	Best call	Why
One torsion spring broke on a paired system, door is 7+ years old	Replace both	The surviving spring has the same age and cycle count. It usually fails weeks or months later, which means a second visit and a second period with a door you cannot use.
One torsion spring broke and the door is relatively new	Ask the technician	If the springs are genuinely young and the break was from a defect or an isolated cause, a single replacement can make sense.
One extension spring broke	Replace both	Extension springs live identical lives on each side. Replacing one leaves the door unbalanced and the other spring on borrowed time.
A spring is only showing wear signs, not broken	Replace the pair on a schedule	Replacing both before a breakage avoids the bang, the stuck door, and the secondary damage a failure can cause to cables and the opener.
One spring broke years after the other was replaced	Ask the technician	The older spring may still have life, but the door should be inspected for balance — the surviving spring's condition decides.

There is also a practical reason beyond the springs themselves: a single-spring replacement is only as good as the balance it produces. Two springs of the same age, wound to the same spec, balance the door evenly. A new spring paired with a tired one can pull the door unevenly and strain the opener, which is why technicians check the balance after every spring job.

What the Technician Does During a Spring Replacement

Replacing springs is a controlled, step-by-step job, and the tension in the system is what makes it strictly professional work. Here is what to expect when a technician arrives.

1. Identify the system and size the springs. The technician confirms whether your door uses torsion or extension springs, weighs or measures the door, and selects springs rated for that door's actual weight — not a one-size-fits-all spring. On a paired torsion system, both springs are replaced together.

2. Secure the door. The door is clamped and held so it cannot move while the springs are worked on. The opener is disconnected so nothing can run the door mid-job.

3. Release the tension with the proper tools. A torsion system is unwound with winding bars made for the job; extension springs are released from their cables and pulleys in a controlled way. This is the dangerous step, and the reason spring work is never a homeowner job. A wound spring stores enough energy to lift the whole door — an uncontrolled release can cause serious injury.

4. Install and tension the new springs. New springs are mounted, tensioned to the door's weight, and set so the door balances. Extension-spring jobs include safety cables if they are missing — those cables are what keeps a broken extension spring from becoming a projectile.

5. Inspect the system around the springs. Springs do not live alone. The technician checks cables, drums, pulleys, and bearings, because a spring failure stresses everything connected to it. A frayed cable found at spring time is a future off-track failure caught early — if it needs attention, a garage door cable repair can be handled in the same visit.

6. Balance and test the door. The door is run through its full travel by hand first, then with the opener. It should move smoothly, sit level, stay where it is lifted, close fully, and not strain the opener. If anything is off, the job is not finished.

7. Explain what was done. You should hear, in plain language, which springs were replaced, what condition the rest of the system is in, and what to watch for going forward.

When to Call — and What It Costs

Call when you notice any of the warning signs above, especially a loud bang, a door that will not open, or a door that suddenly feels far heavier than it used to. A door with a broken or weakening spring should not be run repeatedly: every cycle strains the opener and the cables, and a door that fails completely can jam shut or drop.

Most garage door repairs fall between $150 and $600, depending on the problem and the parts involved. Spring replacement typically falls in the $200–$350 range for most residential doors, varying with the door's weight, the spring system, and whether the door can be converted to torsion. The exact figure depends on your door, so call Garage Door Repair Pros at (210) 964-8892 and describe what you see. You should hear the options and the likely range before any work begins.

If your door is stuck open with a broken spring and your home is unsecured, say so when you call — an emergency garage door repair call connects you with a local technician who can secure the opening first and then carry out the repair. For California homeowners, heat and daily multi-car use wear springs faster than gentler climates suggest, so treat a weakening spring as a before-it-breaks job, not an after.

Frequently Asked Questions