The difference between torsion vs tension garage door springs comes down to how they store energy. Torsion springs are wound around a shaft above the door and twist as it closes; tension springs, also called extension springs, stretch as the door moves and pull it back. Both counterbalance the weight of the door so it can be lifted by hand or by a modest opener.
Knowing which type you have helps you understand how the door works, describe a fault accurately and recognise a failure early. This guide explains how each system works, which doors commonly use them, how to identify yours by sight and why both should be left to an engineer when they need attention.
Why garage doors need springs at all
A steel or timber garage door is heavy, far heavier than most people could lift comfortably without help. The springs carry most of that weight. When they are correctly matched and adjusted, a balanced door feels light to lift and will stay roughly where you leave it partway open.
That balance is also what protects an electric opener. The motor is designed to guide a balanced door, not to haul a dead weight. If a spring weakens or breaks, the opener strains, the door may stop or reverse, and other parts start to wear quickly.
The springs store a large amount of energy to do this job. That is what makes them effective and also what makes them dangerous to adjust or replace without the right tools and training.
How torsion springs work
A torsion spring is a tightly wound coil fitted over a horizontal steel shaft above the door opening. One end of the spring is fixed to a bracket, and the other is attached to a winding cone clamped to the shaft. As the door closes, the lift cables unwind from drums at each end of the shaft, turning it and twisting the spring tighter. When the door opens, the spring unwinds and turns the shaft, winding the cables back onto the drums and lifting the door.
Where you find them
- Most sectional garage doors, with springs mounted on a shaft at the front above the opening, or at the rear of the tracks on some low-headroom installations
- Some up-and-over door designs that use a shaft-mounted spring arrangement
- Manual roller doors, where springs inside the barrel help balance the curtain
Torsion systems are generally smooth and controlled, and when a spring breaks it stays on its shaft rather than flying loose. They are, though, wound to a high tension and must only be adjusted with proper winding bars by someone trained to do it.
How tension springs work
Tension springs, often called extension springs, work by stretching. They are long coils fixed at one end to the frame and at the other to the door's lifting arms, pulleys or cables. As the door closes, the springs stretch and store energy; as it opens, they contract and help pull it up.
Where you find them
- Most traditional up-and-over garage doors, both canopy and retractable types, where the springs sit at each side of the frame and connect to the pivot arms
- Some sectional doors, particularly certain ranges where the springs sit in the side frames, sometimes in a spring-in-spring arrangement
- Some older or lighter doors where a simple counterbalance is enough
Tension springs are simpler in principle, but they carry their own risk. When one snaps under load, the broken parts can whip or fly unless the spring is contained or has a safety cable running through it. Older up-and-over doors often have neither.
Torsion vs tension garage door springs: the key differences
This side-by-side comparison covers what matters most to an owner.
| Torsion springs | Tension (extension) springs | |
|---|---|---|
| How they store energy | Twisting around a shaft | Stretching along their length |
| Where they sit | On a horizontal shaft above the door, or inside a roller door barrel | At the sides of the frame, or alongside the tracks |
| Common door types | Sectional doors, manual roller doors | Up-and-over doors, some sectional ranges |
| Typical feel | Smooth and controlled travel | Can feel springier, especially as springs age |
| When one breaks | Gap appears in the coil, spring stays on the shaft | Spring snaps apart, parts may hang loose or fly if uncontained |
| Usual signs of failure | Loud bang, door very heavy, cables slack | Door lopsided or heavy on one side, spring visibly broken or stretched |
| Who should replace them | An engineer | An engineer |
Neither type is simply better. The right spring is the one designed for your door's weight, height and mechanism, sized and set correctly.
How to tell which springs your garage door has
You can usually identify the system with a quick look from inside the garage. Do it with the door closed, and look without touching.
- Look above the door. A horizontal metal bar running across the top of the opening, with one or two coiled springs wrapped around it and drums at each end, means torsion springs.
- Look at the sides of the frame. Long coiled springs running vertically up each side, hooked to arms that pivot with the door, mean tension springs. This is the classic up-and-over layout.
- Look along the horizontal tracks. On some sectional doors, springs run parallel to the tracks or sit inside the side frames.
- Check the barrel. On a roller door, any springs are hidden inside the barrel housing above the opening.
If you have a wide double garage door, perhaps on a detached house in Heswall, or an older single up-and-over door on a semi in Mossley Hill, the layout will usually be obvious once you know what to look for. If you are still unsure, a photo of the area above and either side of the door is often enough for an engineer to identify it.
How long do garage door springs last?
Springs are rated in cycles, where one cycle is a full opening and closing. Standard springs are commonly rated at around 10,000 cycles, and higher-cycle springs are available for doors that are used very often. How long that lasts in years depends almost entirely on how much the door is used: a garage opened several times a day will reach its rating far sooner than one used for storage.
Other factors shorten spring life, including:
- damp and corrosion, which are common in Merseyside garages and worse near the coast
- springs that were the wrong size for the door in the first place
- a door that is out of balance, overloading one spring
- lack of maintenance, so rust and friction build up on the coils
Our guide on how to tell if a garage door spring is broken covers the warning signs in more detail.
Why spring replacement is a job for an engineer
Whatever type you have, replacing or adjusting springs is one of the most dangerous jobs on a garage door. Torsion springs have to be unwound and rewound under high tension using winding bars, and tension springs, cables and arms must be released and refitted in the right order. A slip can cause serious injury.
A proper garage door spring replacement involves identifying the correct spring by size, wire thickness and length, fitting matched pairs where the door uses two, and setting and testing the balance. On torsion systems the cables and drums are checked at the same time, as a broken spring often goes hand in hand with cable damage, as explained in our article on what to do when a garage door cable has snapped.
On older up-and-over doors, an up-and-over garage door repair may also involve the pivot arms, brackets and frame fixings, which wear alongside the springs. For sectional doors, a sectional garage door repair covers the shaft, bearings, drums, cables and rollers that work with the torsion springs.
Booking a spring check
If your door has become heavy, lifts unevenly, has made a loud bang, or you can see a gap in a coil or a stretched spring, stop using it and leave it closed if possible. Don't try to lift it by hand or adjust any part of the spring system.
Call us or book online with our garage door repair company in Liverpool and a local engineer will identify the spring type, check the condition of the rest of the counterbalance system and explain the options before any work begins.
Frequently asked questions
Are torsion springs better than tension springs?
Not as a rule. Torsion springs tend to give smoother, more controlled travel and stay on their shaft when they break, which is why most sectional doors use them. Tension springs suit the design of most up-and-over doors. The best spring is one correctly matched to the door.
Can I change my garage door from tension to torsion springs?
Sometimes, but it depends on the door. Up-and-over doors are designed around their spring and arm geometry and usually can't simply be converted. On some sectional doors a different spring system is possible. An engineer can advise whether it is practical for your door.
How do I know if my garage door spring needs replacing?
Common signs are a loud bang from the garage, a door that suddenly feels very heavy or won't stay open, a visible gap in a torsion spring coil, a stretched or broken tension spring, or slack cables. If you notice any of these, stop using the door and get it checked.
Should garage door springs be replaced in pairs?
Where a door uses two springs, replacing both is usually recommended. They have done the same number of cycles, so the other is likely to fail soon, and matched springs keep the door balanced evenly.
Why are tension springs dangerous when they break?
A tension spring is stretched under load, so when it snaps the broken ends can whip or fly. Containment or a safety cable through the spring reduces this risk. Older doors often lack these, which is another reason to keep clear of a door with a broken spring.
Do electric garage doors still need springs?
Most do. The opener is designed to move a balanced door, and the springs take most of the weight. Some roller doors rely mainly on a tubular motor, but up-and-over and sectional doors with openers still depend on correctly set springs.