What It Costs
Mercer Island has 9,893 households, a small slice next to the roughly 251,878 across the whole Seattle service area we cover. That size matters for cable work: it's a tight island of houses built in a narrow window, so the failures we see repeat the same pattern instead of spreading across fifty different eras of hardware. We don't have a set price to quote you here, and we're not going to make one up. What drives the number is whether one cable frayed or both, whether the drum grooved from the old cable digging in, and whether the spring on that side needs to come off first to get the drum safe to handle. A single snapped cable on a torsion door is usually a straightforward swap. A cable that's been dragging loose against a stuck roller for months, and has chewed up the track along with it, is a different job. Ask for the number after someone's looked at the drum and the track, not before.
Worth knowing: at a median household income of $202,359, we find more owners here choose to replace both side cables and the drums together rather than fix the one that broke and wait on the other. That's a homeowner's call to make, not one we push.
Doing It Yourself
A garage door cable is not a DIY repair, and we'll say that plainly rather than hedge it. The cable is under load from a torsion or extension spring that can hold well over a hundred pounds of tension, and that tension doesn't go away just because the cable already snapped, the spring is often still wound tight, waiting to unload through whatever's nearest, which is usually a hand. You can safely do a few things yourself: pull the emergency release cord so the door doesn't try to run on the broken cable, and leave the opener unplugged so nobody triggers it by accident. Past that, leave the drums, the spring, and the shaft alone. If the door is a single lightweight panel and the spring is already fully unwound, some owners can get it manually lowered and blocked, but if you're not certain the spring has no tension left, don't guess. The honest limitation here: we don't walk people through cable replacement over the phone, because a mistake on this specific job causes real injuries, not just a redo.
The Complications
The median home on Mercer Island went up around 1973, which puts a good number of these garages on torsion hardware from before galvanized aircraft cable became the standard fix-all spool at the supply house. Original drums from that era can be worn or slightly undersized for a modern replacement cable, so the swap isn't always a straight pull-and-thread, sometimes the drum needs replacing too, or the cable needs to be sized to match an odd original spool rather than whatever's on the truck by default.
The climate here runs mild with only occasional freeze, which changes how these cables fail. In a place with hard winters, cables tend to snap outright when ice locks a roller and the door tries to force through it. Here, the more common failure is slow: damp air working into the strands over years until the cable frays rather than parts cleanly. That shows up as a rough, fuzzy section of cable rather than a sudden break, and it's easy to miss until the door starts running crooked on one side.
The Symptom
The door hangs unevenly, one side higher than the other, or the whole panel racked at an angle in the opening. If a cable has fully let go, the door will drop hard on that side and may jam sideways in the track, sometimes bending the track itself on the way down. Before a full break, you'll often hear it first: a grinding or clicking sound as a frayed strand catches on the drum with every open and close cycle. Some owners notice the door suddenly feels heavier to lift by hand, which usually means one cable is carrying load it shouldn't be carrying alone anymore.
Don't run the opener again once you notice any of this. Running a door on a partially failed cable is what turns a cable job into a cable-plus-track-plus-panel job, and that's a repair bill nobody needs to create for themselves.
Time on the Job
We run these trucks out of Seattle, about 7 miles to reach Mercer Island, so a cable call here gets folded into the day's route rather than treated as a separate dispatch. Once someone's on site, a standard two-cable replacement on a torsion door, including checking the drums and re-tensioning the spring afterward, usually runs under an hour. Add time if the drum needs replacing, if the track took damage from the door dropping crooked, or if the opener's travel limits need resetting once the door is hanging level again. We won't quote a fixed window before we've seen the drum condition, because guessing on that just sets up a broken promise later in the day.
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Questions, answered
How do I know if it's the cable and not the spring?
A broken cable usually lets the door drop unevenly on one side while the opposite side stays roughly in place, and you may see the loose cable hanging or coiled near the bottom bracket. A broken spring tends to make the whole door feel dramatically heavier but doesn't usually leave the door tilted. Either way, stop using the opener and call it in rather than guessing which part failed.
Can one cable be replaced without touching the other?
Mechanically, yes, but most shops replace both sides together, since the second cable is carrying the same age and wear as the one that already failed. Given the median income here, we see more owners choose to do both at once rather than pay for a return trip when the second one goes a few months later.
Will the mild climate here shorten cable life?
Not the way hard winters do. In this climate, cables usually fail from slow fraying due to persistent damp rather than sudden snapping from ice-locked rollers. That means a cable can look fine on the outside longer, so a grinding sound or slight drag is worth checking before it lets go completely.
Is my garage's original hardware from the 1970s a problem?
Not on its own, but a lot of Mercer Island garages built around 1973 still have original drums sized for older cable stock. When we replace the cable, we check whether the drum groove is worn or undersized before assuming a standard replacement cable will seat correctly.
Tell Us What the Door Is Doing
Call and we'll ask a few questions before a truck leaves, then give you a straight answer on repair versus replace.