Torsion vs. Extension Springs: Which Does Your Garage Door Have?
When a spring breaks, the first thing a technician needs to know is which kind you have. Here’s what to look for, how the two types differ, and why it matters here on the Grand Strand.
What Springs Actually Do
A garage door weighs a lot, often well over a hundred pounds for a single door and considerably more for a double. Springs counterbalance that weight so the door feels light in your hand and so the opener doesn’t have to do all the lifting. When a spring fails, the door becomes effectively too heavy to lift safely — one of the most common reasons behind a garage door that won’t open.
Torsion Springs
Where they are: Mounted horizontally on a metal shaft directly above the closed door, at the top of the opening.
How they work: They twist (torque) as the door closes and unwind to help lift it as it opens. Most modern residential garage doors use one or two torsion springs.
Advantages:
- Smoother, more controlled operation
- Generally longer lifespan
- Typically considered the safer design in the event of a break, since the spring stays mounted on the shaft
Cycle life: A standard torsion spring is commonly rated for around 10,000 cycles (one cycle is one open plus one close). If you use your door four times a day, that works out to roughly seven years, which lines up with the 7-9 year lifespan we see here. High-cycle springs, rated for far more cycles, are available and worth considering.
Extension Springs
Where they are: Running along the horizontal tracks on either side of the door, stretching and contracting as the door moves.
How they work: They extend when the door closes and contract to help lift it open.
Advantages:
- Lower upfront cost
- Common on older installations and lighter doors
Things to know: Extension springs should have a safety cable running through the center of each spring. If the spring breaks, the cable contains it so it doesn’t whip across the garage. If your extension springs don’t have safety cables, it’s worth having them added.
How to Tell Which You Have
Stand inside the garage with the door closed and look at the top.
- A long spring sitting on a bar right above the door: torsion.
- Springs running along the sides, parallel to the tracks: extension.
- Two springs above the door on one shaft: still torsion, just a two-spring system.
That’s it. Take a photo and tell us when you call, and we can usually plan the repair before we arrive.
Why It Matters for Repairs
- Parts and sizing. Springs must match your door’s weight and size exactly. A wrong spring makes the door unbalanced, which strains the opener.
- Pricing. A single torsion spring replacement typically runs $200-350, a pair $350-500, and an extension spring pair $200-350.
- Safety. Both types store significant energy. Neither is a DIY job. See our DIY vs. professional guide.
- Replacing one or both. With torsion springs, we usually replace both, since the second has endured the same wear and tends to follow soon after.
Which Is Better for the Coast?
Torsion springs are generally the better long-term choice, and if you’re replacing a door or upgrading from extension springs, it’s worth asking about. In our climate, upgrading to a high-cycle torsion spring is one of the most cost-effective decisions you can make, since salt air shortens standard spring life. We explain why in our coastal corrosion guide.
High-Cycle Springs: Worth Asking About
A standard spring is built to a baseline cycle rating, and a high-cycle spring is built to last considerably longer, usually with a thicker wire or longer coil. The price difference on a replacement is typically modest, often in the range of $50-100 extra, and on this coastline it tends to pay for itself, since you’re replacing springs on a shorter timeline than most of the country. If you’re going to pay for a spring visit anyway, it’s one of the few upgrades we recommend almost every time.
Signs Your Springs Are Wearing Out
- Visible rust or pitting on the coil
- A door that feels heavier than it used to
- Noisier operation
- A door that doesn’t stay put when you lift it halfway by hand
- Uneven movement
Any of these is a reason to get an inspection before the spring lets go at an inconvenient time. See our spring repair page for details.
Frequently Asked Questions
Torsion springs mount on a shaft above the door and twist to lift it. Extension springs run along the side tracks and stretch and contract.
Torsion springs generally last longer and run smoother, especially high-cycle versions.
Torsion springs sit horizontally above the door; extension springs run along the horizontal side tracks.
For torsion springs, we typically recommend it, since the second has endured the same wear.
A single torsion spring typically runs $200-350, a pair $350-500, and an extension spring pair $200-350.
Not Sure Which Springs You Have?
Call (854) 248-1833 and we’ll identify them for you.