Broken Spring Repair
Garage door springs counterbalance the door’s full weight. When one breaks, the door becomes too heavy to lift safely — this is the single most common reason a garage door suddenly stops working.
Garage door springs do the heavy lifting — literally. A typical residential door weighs 130 to 400+ pounds, and torsion or extension springs store the mechanical energy that makes it possible to lift that weight by hand or with a modest opener motor. Springs are rated for a fixed number of open-close cycles, commonly around 10,000 cycles, which works out to roughly 7 to 10 years of average household use (about 3–4 cycles per day). Once a spring reaches the end of its cycle life, or is weakened by rust, corrosion, or temperature extremes, it can fail suddenly — usually with a loud bang.
There are two main spring systems: torsion springs, mounted horizontally above the closed door on a metal shaft, and extension springs, mounted above the horizontal tracks on either side of the door. Torsion springs are more common on modern doors and are generally considered more durable and safer when properly installed with safety cables, though both systems fail the same way — predictably, at end-of-cycle-life, and unpredictably, from cold-weather brittleness or corrosion.
Because springs are under significant tension even when the door is closed, spring replacement is one of the least DIY-friendly garage door repairs. A technician measures the door’s weight and the wire size, coil diameter, and length of the existing spring (or calculates the correct replacement rating from the door’s dimensions) to ensure the new spring provides accurate counterbalance — too weak and the opener will strain and fail early; too strong and the door won’t stay down.
Common problems this covers
Loud bang, then a stuck door
The most common presentation of a torsion spring failure — a loud pop or bang, followed by a door that won’t open or feels extremely heavy.
Visible gap in the spring coil
A torsion spring with a visible separation in the coil (usually above the garage door) has already failed even if the door still moves slightly.
Door opens partially then stops
A weakening (not yet fully broken) spring can allow an opener to lift the door partway before stalling.
One side of the door appears to sag
On doors with two torsion springs or two extension springs, failure of just one spring often causes a visible tilt or one side dropping.
Cables appear loose or frayed
Cables work with the spring system to guide and control the door; a failing spring or cable often shows up together, and both should be inspected as a pair.
How it works
- 1
Spring system inspection
Technician identifies torsion vs. extension system, counts and measures the existing spring(s), and inspects cables and drums for related wear.
- 2
Correct spring sizing
The replacement spring is matched to your door’s exact weight and dimensions — not a generic one-size part — to restore proper counterbalance.
- 3
Safe replacement with winding tools
Old springs are safely unwound and removed; new springs are installed and wound to the correct tension using proper winding bars, never improvised tools.
- 4
Balance test
The door is manually tested at the half-open position — a properly balanced door should stay in place without drifting up or down.
Why it matters
A broken spring doesn’t just mean an inconvenient door — it means the door’s entire counterbalance system has failed, putting extreme strain on the opener if someone tries to use it, and creating a serious risk of injury if someone tries to lift the door manually. Most manufacturers and professionals recommend replacing both springs on a two-spring system at the same time, since the second spring is typically near the same end of its cycle life.
Frequently asked questions
How long do garage door springs last?
Most torsion springs are rated for approximately 10,000 open-close cycles. For an average household opening the door 3–4 times a day, that works out to roughly 7–10 years, though usage patterns, spring quality, and climate (cold brittleness, humidity/corrosion) can shorten or extend that range.
Should I replace one spring or both?
On a two-spring system, most professionals recommend replacing both at the same time even if only one has broken, since both springs were installed at the same time and are typically close to the same point in their cycle life. Replacing only one can also leave the door unevenly balanced.
Why did my garage door spring break in cold weather?
Cold temperatures make spring steel more brittle and can amplify stress on a spring that’s already near the end of its cycle life, which is why spring failures are noticeably more common during cold snaps in northern and midwestern climates.
Is it dangerous to replace a garage door spring myself?
Yes — torsion springs are under high mechanical tension even when the door is closed, and improper winding or unwinding is a well-documented cause of serious injury. This is one of the few garage door repairs almost universally recommended to be left to a trained technician with the correct winding tools.
Can I still use my garage door with a broken spring?
It is not recommended. With a broken spring, the opener has to lift the door’s full weight unassisted, which can strip gears, burn out the motor, or cause the door to fall unexpectedly. Leave the door closed and avoid using the opener until the spring is replaced.