Open Sesame Garages · Oklahoma City
Does my garage door need one torsion spring or two?
Door weight decides it. A light single-car door can run safely on one properly sized torsion spring, while most double doors and heavy insulated doors use a matched pair. Two springs are also the better setup on any door you depend on, because when one breaks the other still carries part of the load instead of dropping the whole weight at once.
What each setup is good at
- One spring: fewer parts, lower cost, and enough for a light single-car door. The trade-off is that a break means the door goes from fully counterbalanced to carrying all of its own weight in an instant.
- Two springs: the load is split, so each spring works less hard for the same door. A failure is more gradual, and the pair can be sized more precisely to the door weight than one large spring can.
- Two springs also give you a spare margin of safety on heavy doors, which is why we default to a pair on anything double-width or insulated.
How to tell what you have now
Stand inside the garage with the door closed and look at the steel shaft running above the opening. One coiled spring in the middle means a single-spring system. Two springs, usually meeting at a center bracket in the middle of the shaft, means a matched pair.
On a pair, one spring is left-wound and the other right-wound. They are not interchangeable between sides.
Can you add a second spring later?
Usually yes. Converting a single-spring door to a two-spring system means a center bracket, a matched pair sized to the split load, and often a longer shaft — so it is a hardware change, not just an extra spring.
It is worth doing on a heavy door, a door that gets used many times a day, or a door where a single spring keeps failing early. On a light single door with a correctly sized spring, it is an upgrade rather than a fix, and we will say so.
Related questions
Is a two-spring door safer than a one-spring door?
Both are safe when properly sized and installed. The difference shows up at the moment of failure: with two springs the surviving spring keeps carrying part of the load, so the door does not go instantly to its full weight. On a heavy door that difference matters.
If I have two springs and one breaks, do both get replaced?
Yes. They have the same age and cycle count, so the survivor is usually not far behind. Replacing the pair in one visit costs less than two service calls and keeps the door balanced.
Does two springs mean twice the cost?
No. Springs sized for a split load are smaller than the single spring they replace, and the labor is the same visit either way. In the OKC metro, spring replacement runs $150 to $350 per spring depending on door weight and type.
Need this fixed, not just explained?
Open Sesame Garages serves Oklahoma City and the surrounding metro with same-day estimates and 24/7 emergency repair.