Torsion vs extension springs: which does your door have?

Your garage door uses either torsion springs or extension springs, and telling them apart takes 10 seconds. Torsion springs sit horizontally on a metal shaft above the door opening. Extension springs run along the horizontal tracks on each side, stretching and contracting as the door moves. Torsion is the more common and durable modern setup, while extension springs appear on older and lighter Adelaide doors. Both are wound under high tension and dangerous to replace yourself. A single spring replacement costs $180 to $350, and a torsion pair $300 to $550.

How to tell which you have

Look above and beside the closed door.

• Torsion: a metal shaft runs horizontally across the wall just above the door, with 1 or 2 tightly coiled springs mounted on it. When it fails, you often see a clear gap in the coil.
• Extension: long, lighter springs run parallel to the horizontal tracks on each side of the ceiling, and they visibly stretch as the door opens. They usually have a safety cable threaded through them.

If you cannot see the spring clearly, note whether the mechanism is above the opening (torsion) or along the sides (extension). Either way, once you know a spring has gone, the broken garage door spring guide covers the signs and next steps.

How the two compare

Feature	Torsion	Extension
Location	Shaft above the door	Along the side tracks
Typical lifespan	10,000 to 15,000 cycles	8,000 to 10,000 cycles
Balance and smoothness	Smoother, better balanced	Bouncier, less controlled
Safety	Contained on the shaft	Needs safety cables to contain a break
Common on	Modern and heavier doors	Older and lighter doors
Replacement cost	$180 to $350 single, $300 to $550 pair	$180 to $350

Torsion springs generally last longer and control heavier doors more smoothly, which is why most modern Adelaide installs use them. Extension springs are cheaper up front and still common on older sectional and tilt doors, particularly across the established northern-plains estates. For the full picture on pricing, see the repair cost bands or run the repair cost estimator.

Why the spring type matters for your repair

Knowing your spring type helps a specialist arrive with the right part and quote accurately. It also affects the safety approach. Both types store serious energy, but they fail differently: a torsion spring unwinds violently on the shaft, while a broken extension spring can whip if it lacks an intact safety cable. This is precisely why spring replacement is not a DIY job. A vetted Adelaide operator carries the correct winding bars for torsion work and the right-gauge springs for your door weight.

Coastal corrosion hits both types

In the salt-air belt (Port Adelaide, Semaphore, Henley, Glenelg, Hallett Cove), both torsion and extension springs corrode from the inside and fail years earlier than inland. Near the coast it is worth paying for galvanised or marine-grade springs, because standard steel simply rusts and fails again within a few years.

Frequently asked questions

Which spring type is better?

For most doors, torsion. It lasts longer, balances the door more smoothly, and is safer because it is contained on the shaft. Extension springs are cheaper and fine for lighter, older doors, but many owners upgrade to torsion when replacing.

Can I convert from extension to torsion springs?

Often yes, if there is headroom above the door for the shaft. A conversion gives smoother, longer-lasting operation, though it costs more than a like-for-like extension replacement. A specialist can tell you whether your door and frame suit it.

How do I know if it is the spring or something else?

If the door suddenly feels extremely heavy by hand or opens 100mm then stops, it is almost certainly a spring. If it lifts easily but the motor will not run, the fault is more likely the opener or motor, covered in the grinding noise and motor guides.

To replace the right spring safely, get matched with vetted Adelaide specialists free and compare quotes.