Torsion vs Extension Springs: Which Does Your Door Have?

Torsion vs Extension Springs: Identifying What You Have

When a homeowner calls us about a broken spring, the first question we ask is: torsion or extension? Most people have no idea. And that is fine — until a spring breaks at 6 AM and you need to describe what happened to your garage door tech. Here is how to tell the difference and why it matters.

How to Identify Your Spring Type

Torsion springs are mounted on a metal shaft that runs horizontally above the inside of the garage door opening. Stand inside your garage and look up at the top of the door frame. If you see one or two tightly wound springs sitting on a bar directly above the door — that is torsion. The springs connect to cable drums on each end of the shaft, and cables run down to the bottom brackets on each side of the door.

Most double garage doors (16 feet wide) in the Tacoma and Olympia area have two torsion springs. Single-car doors usually have one, though some older installations use two smaller springs.

Extension springs run along the horizontal tracks on both sides of the door, parallel to the ceiling. They are easier to spot because they visibly stretch and contract as the door moves. When the door is closed, extension springs are fully stretched. When the door is open, they are relaxed. You will also see a set of pulleys and cables connecting the springs to the door.

If your home was built before the mid-1990s and the garage door has not been replaced, there is a good chance you have extension springs. Most new installations in western Washington use torsion springs exclusively.

Pros and Cons Comparison

Torsion Springs

Advantages: - Smoother, more controlled door movement — the door does not jerk or bounce - Longer lifespan — torsion springs typically last 15,000 to 20,000 cycles compared to 10,000 for extension - Safer when they break — the spring stays on the shaft rather than flying across the garage - Better for heavy doors — double-car doors and insulated doors perform much better on torsion - Less wear on the opener motor and tracks because the lifting force is more evenly distributed

Disadvantages: - Higher upfront cost — a single torsion spring replacement runs $200 to $350 in our area - Requires more headroom above the door (typically 12 inches minimum) - Must be serviced by a licensed professional — the winding tension is lethal if mishandled

Extension Springs

Advantages: - Lower cost — a pair runs $150 to $250 in the Puget Sound area - Require less headroom — good for garages with low ceilings - Simpler mechanism — fewer specialized parts

Disadvantages: - Shorter lifespan — typically 10,000 cycles - More jerky door movement, especially as springs age - Dangerous if safety containment cables are missing — a broken extension spring becomes a projectile - More wear on opener and tracks due to uneven force distribution - Noisier operation

Safety Containment Cables

If you have extension springs, check right now whether safety containment cables are installed. These cables run through the center of each extension spring and anchor to the wall or track at each end. If a spring breaks, the cable contains it — preventing a high-tension steel spring from launching across your garage.

We see homes regularly — especially older homes in Lakewood, University Place, and south Tacoma — where extension springs were installed without containment cables. This is a serious safety hazard. If your extension springs do not have cables running through them, call a garage door professional to add them. It is a quick, inexpensive fix that could prevent a serious injury.

When to Upgrade from Extension to Torsion

We recommend upgrading to torsion springs when:

• Your extension springs have broken and need replacement anyway — the cost difference to switch to torsion is only $100 to $200 more than replacing extension springs, and you get a better, safer system
• You are installing a new, heavier insulated door — extension springs struggle with heavier doors and wear out faster
• You are replacing your garage door opener — this is a natural time to upgrade the full system
• Your extension springs do not have safety containment cables and you want a safer overall setup
• You have rooms above or adjacent to the garage and want quieter, smoother operation

The conversion requires adding a torsion spring bar and bracket above the door, which your technician can typically complete during the same service visit. Most garages in our service area have adequate headroom for the conversion.

Can You Mix Spring Types?

No. You cannot run one torsion spring and one extension spring on the same door. The counterbalance systems work differently and would create uneven lifting forces that damage the door, tracks, and opener. When upgrading, both sides convert to the same system.