Garage door cable replacement is the repair you need when a steel cable on either side of the door has snapped, frayed or slipped off its drum. Fitted by a professional, a new pair typically costs $150 to $350 including labour. The cables themselves are cheap, often under $50 a pair. What you are paying for is the safe handling of the springs they are attached to — and that is not a formality: the industry safety body is blunt that these cables should be replaced only by a trained technician.
Read This First: The Spring Warning
Your door does not lift itself. A typical double door weighs 150 to 400 pounds, and nearly all of that weight is carried by the spring system — a torsion spring wound on a shaft above the door, or extension springs stretched along the tracks. The cables link those springs to the bottom corners of the door, so the cables, the bottom brackets they attach to, and the drums they wind onto are all part of a system under extreme tension.
DASMA — the Door & Access Systems Manufacturers Association, the industry’s own trade body — puts it plainly: check your cables visually, and if they are frayed or worn they are in danger of breaking, but “due to the dangers associated with high spring tension, these cables should be replaced only by a trained technician.” Its opener safety guide is blunter still: do not loosen or adjust any bottom brackets, red-coloured fasteners, cables or supports — only trained technicians should adjust these components.
So the rule for this whole article:
- Never unwind, adjust or remove a torsion spring, and never put anything except a proper winding bar in its winding cone. A screwdriver used as a winding bar is how many of the serious injuries happen.
- Never loosen the bolts on the bottom brackets of the door. They look like ordinary brackets. They are connected directly to the springs and are under extreme tension.
- Do inspect and maintain everything that is not under tension — the checklist near the end is yours to do.
Some guides present torsion-door cable replacement as a routine weekend project. That advice skips the dangerous step: the cable cannot be removed and refitted without dealing with the wound spring’s tension. Follow DASMA’s line, not theirs.
What the Cables Actually Do
Torsion spring system (a thick spring on a metal shaft above the door). Each cable runs from a bottom bracket at the door’s lower corner up to a grooved drum on the spring shaft. As the door opens, the spring unwinds and the cables wind onto the drums, lifting evenly from both corners; as it closes, the spring rewinds and the cables unwind. These are lift cables, two of them — one per side. If one fails, the other side keeps lifting, which is why the door usually jams or hangs crooked rather than falling flat.
Extension spring system (springs running alongside the horizontal tracks). Each spring stretches as the door closes and contracts as it opens, pulling the lift cable through a pair of pulleys. Extension systems also use a second, separate part: a safety cable running through the middle of each spring. It does no lifting — its job is to catch the spring if it snaps, so the broken spring stays threaded on the cable instead of flying across the garage. If your extension springs have no safety cables, DASMA says to call a dealer for a safety inspection.
The cable itself is not exotic. Most residential lift cables are galvanised steel aircraft cable in a flexible 7×19 construction (seven strands of nineteen wires), most often 1/8 inch diameter on standard doors, 5/32 or 3/16 inch on heavier ones. Length is matched to the door’s height.
Signs a Cable Is Broken — or About to Break
Catch the cable at the fraying stage and you get a planned repair instead of an emergency call-out. The warning signs:
- Frayed strands. Individual wires sticking out like a tiny wire brush, most often near the bottom bracket or the drum. Any fraying at all means replacement is due now, not soon.
- Rust. Orange or dark staining along the cable, worst near the floor where water and road salt collect. Rust eats the inner strands you cannot see.
- Slack or loose cable. A cable hanging loose on one side, or loops tangled around the drum or shaft — it has snapped, stretched or jumped off the drum.
- The door hangs crooked. One corner sits lower than the other, or the door skews as it moves — one side has lost its lift.
- The door will not open, or opens a few inches and stops. The opener strains, hums, or reverses. Stop pressing the button — the opener is not built to lift a door whose counterbalance has failed, and forcing it can strip the opener’s gears. If the opener cuts out or the garage lights flicker under load, that points to a separate electrical fault — see why lights flicker.
- A loud bang from the garage. That is more often a spring snapping than a cable, and the two failures travel together: a broken spring dumps slack into the cables, and a broken cable can leave the door hanging off one spring. Treat it as the same emergency either way.
- The door feels dead heavy if you try to lift it manually, or it slams rather than glides down. The counterbalance — springs and cables together — is no longer carrying the weight.
Why Cables Fail
Cables rarely snap out of nowhere. The usual causes are rust creeping in from the bottom of the door, strand-by-strand wear where the cable bends over the drum or rubs a misaligned track, a cable that was the wrong size for the door’s weight, and age. A working estimate used across the trade puts cable life at roughly 7 to 15 years, shorter in damp or coastal garages. That is also why one snapped cable condemns the other: both sides were fitted on the same day, have done the same trips, and live in the same air. Replace only the broken one and you usually buy a second visit within a year or two — and run an unbalanced door in the meantime.
If a Cable Snaps: What to Do Right Now
- Stop using the opener. Unplug it or switch off its breaker so nobody opens the door by remote by habit.
- Keep people and cars clear of the doorway. A door held by one cable can drop or skew without warning.
- Do not try to lift it manually. Without its counterbalance the door is most of its full weight, and lifting it can pull the remaining cable off its drum.
- Do not touch the springs, bottom brackets or drums while you wait.
- Call a technician and describe what you see. “One cable has snapped and the door is sitting crooked” gets you the right van and usually a same-day slot. A photo of both bottom corners and both drums is safe to take from a standing position, without touching anything, if the company asks for one.
DIY or Pro? The Honest Decision Guide
The parts are cheap and the job looks simple on video, so the temptation is real. Here is where the line falls, following DASMA’s guidance rather than sales copy:
| Task | Who should do it |
|---|---|
| Looking at the cables for fraying and rust (eyes only) | You |
| Monthly door-and-opener checks: photo-eye test, auto-reverse test, balance check | You — these are in DASMA’s opener safety guide |
| Lubricating rollers, hinges and springs with a garage-door lubricant | You |
| Checking that extension springs have safety cables fitted | You — and if they are missing, have them installed |
| Replacing a lift cable on an extension-spring door | Pro recommended — the spring is under high tension whenever the door is closed |
| Replacing a lift cable on a torsion-spring door | Pro only — the cable cannot be swapped without controlling the wound spring |
| Anything involving the torsion spring, winding cones, drums or bottom brackets | Pro only, no exceptions |
| Loosening red-coloured fasteners anywhere on the door | Nobody at home — these mark parts under tension |
The money argument for DIY is weaker than it looks, too: the cables are the cheapest part of this repair, so all you save is the labour on a $150–$350 bill — against a heavy door and a wound spring.
What a Professional Replacement Involves
Knowing the shape of the job helps you spot a rushed one. A technician will typically:
- Disconnect the opener and secure the door so it cannot move.
- Control the spring tension — on a torsion system, unwinding the spring with proper winding bars; this is the step the whole safety warning exists for.
- Remove both old cables from the drums and bottom brackets.
- Fit the new pair, matched to the door’s height and weight, seated evenly in the drum grooves.
- Re-tension the springs to the manufacturer’s specification and re-check the balance — a balanced door stays roughly where it is left when lifted halfway by hand.
- Run several full cycles and test the opener’s safety reverse before leaving.
Ask, while they are there, for a look at the springs, drums and bottom brackets themselves. A cable that frayed because a drum is worn or a bracket is corroding will fray again on the same schedule.
How Long Does It Take — and Can a Cable Be Repaired Instead?
For a straightforward pair swap with nothing else wrong, expect the visit to run about an hour — most technicians land between 30 and 90 minutes on site. It stretches when the inspection finds company for the cable — a worn drum, a corroding bracket, a spring near the end of its life — all worth doing in the same visit rather than paying for a second call-out.
And no, a frayed cable does not get repaired. There is no safe patch, splice or clamp for a lift cable — once strands start breaking, the cable has lost the strength the door hangs from, and DASMA’s wording for frayed or worn cables is that they “should be replaced.” Replacement, as a matched pair, is the whole fix.
Cost of cable replacement
All figures are approximate US prices checked in November 2026. Published guides disagree — sometimes wildly — so treat any single number, including ours, as a range, not a promise.
| Item | Typical price (approximate) |
|---|---|
| Pair of lift cables, parts only (galvanised 7×19) | $10–$50 at hardware retailers |
| Stainless steel cable pair (for damp/coastal garages) | A little more than galvanised — roughly $20–$30 extra |
| Safety cables for extension springs, pair (parts) | $10–$25 |
| Professional replacement, both cables, parts and labour | $150–$350 (most guides cluster here) |
| Wider published range, all sources | $100–$500 depending on door, region and call-out type |
| Cables plus a broken torsion spring in the same visit | $300–$600+ |
What moves the price: a heavier or taller door (thicker, longer cables), emergency or after-hours call-outs, a TorqueMaster or non-standard spring system, and whatever else the inspection finds. A quote far below the range sometimes covers one cable only — check that both sides are included.
Buying the Right Cable (for the Quote, or the Shelf)
Even if a technician does the fitting, knowing the specification stops wrong parts being fitted to your door:
- Replace both sides together, always.
- Match the length to the door height and the diameter to the door’s weight — 1/8 inch is standard for most residential doors; heavier doors use 5/32 or 3/16 inch. Never fit a thinner cable than the one that came off.
- 7×19 galvanised aircraft cable is the normal construction — flexible enough to wind on the drum thousands of times.
- Consider stainless steel if your garage is damp or coastal, or the last pair died of rust. It costs a little more and resists corrosion.
- Do not substitute bulk wire rope or a generic cable of roughly the right look. A lift cable is a rated lifting component, and the bottom fitting is what your door hangs from.
Keep the Next Pair Alive Longer
Cables mostly die of simple neglect:
- Look at them monthly. Door closed, stand back and look at both cables end to end for fraying, rust or slack. This is the exact check DASMA recommends, and it is eyes-only.
- Run DASMA’s monthly opener tests. The door should reverse when it meets an obstruction and when the photo-eye beam is blocked, and it should balance — staying put when lifted about 3–4 feet off the floor with the opener disconnected.
- Lubricate the moving hardware (rollers, hinges, springs) once or twice a year. The cable itself does not need oil; the parts it works against do.
- Keep the bottom of the door dry. Clear leaves and standing water from the door line, and rinse road salt off the lower door area in winter — the bottom bracket zone is where corrosion starts.
- Act on the first fray. A few broken strands is a cheap, schedulable repair. Ignore it and it becomes a snapped cable, a crooked door and an emergency rate.
The Short Version
A garage door cable is a cheap part doing a dangerous job. Diagnose it by eye — fraying, rust, slack, a crooked door — budget roughly $150 to $350 for a professional to replace the pair, and leave the cables, springs, drums and bottom brackets to a trained technician. Your share of this repair is the inspection, the phone call and the questions — and catching the fray before it becomes a bang.
More cheap-parts, high-judgement repairs: how to fix a leaky faucet and a dishwasher not draining.