What You Are Seeing
Coronado sits 11 miles out from our shop in Spring Valley
Which is the longest run we make on a regular basis. That distance matters for one reason: when a spring lets go on a double door, you don't want a second truck making that trip because the first one didn't have the right part. We load for this before we leave, not after we see the door.
- 11 miles
Most houses here went up around 1974, putting Coronado right in the middle of the 1967-1988 build window that defines a lot of this part of San Diego County
A spring snapping on a door this age usually means a torsion spring that's done its roughly 10,000-cycle life, not a defect in your door. You'll hear it before you see it - a bang like a gunshot, then the door won't lift, or it slams down on its own when you try. If one cable has gone slack on one side while the other stays tight, that's a spring gone on a double-spring setup, and the door is not safe to run until it's replaced.
Coronado's income level runs well above the wider service area average
And we see that reflected in the doors - more original hardware kept in good shape rather than patched repeatedly, which actually makes some of these jobs faster once we're on site.
Parts We Carry
For a 1974-built door, we're usually dealing with torsion springs sized for a standard single or double door of that era, wound for a 7-foot or occasionally 8-foot opening. We carry the common torsion spring sizes on the truck along with the extension spring setups still found on some older single-car doors that haven't been converted.
What we don't carry on every run is a spring wound to a nonstandard shaft diameter or an oversized commercial door spring - those get ordered once we've measured the door in person, which can add a day. We'd rather tell you that up front than have you wait on a truck that doesn't have what your door needs.
We also stock standard safety cables, end bearing plates, and center brackets, since a spring failure on a door this age often takes a bearing or bracket with it. Given the mild coastal-influenced climate here, we're not dealing with spring steel that's rusted through from road salt or heavy freeze-thaw cycling - the failures we see are almost always straight fatigue from cycle count, which is a cleaner, more predictable repair.
How We Fix It
We unwind and remove the broken spring, check the shaft, bearings, and cable drums for wear the break may have caused, and install a matched replacement spring set sized to your door's weight and height. On a double door we replace both springs even if only one broke - the second one is on the same clock and failing it separately a few weeks later means a second trip you shouldn't need to pay for.
We test the door's balance by hand after the new springs go on. A properly balanced door should hold at waist height without the opener holding it there. If it doesn't, we adjust spring tension before we call the job done, not after.
We also inspect the opener's force settings, since a mistimed opener straining against an old spring is part of why some of these failures happen in the first place. On a 1974-era door we're also checking whether the original drums and shaft are flexing - occasionally that hardware needs replacing alongside the spring rather than years later as its own separate call.
Why This Fails Locally
A torsion spring's life is measured in open-close cycles, not years, and a door installed around 1974 has had five decades to run through them
Houses in Coronado built in that window often still carry the original spring and drum setup if no one's touched the door, which means the spring failing now isn't bad luck - it's arithmetic.
The mild temperate climate here is actually a point in your favor
We don't see the rust-driven spring failures that show up in places with real winter freeze-thaw or road salt exposure. What we do see is fatigue failure from straight use, which tends to happen cleanly - the spring breaks at a coil, not gradually weakening in a way that gives you warning.
One honest limit: if your door's drums or shaft show flex or wear beyond the spring itself
Replacing just the spring is a short-term fix. We'll tell you when the smarter move is replacing the hardware set rather than patching around it, even if that's a bigger job than the one you called about.
The Cost of This Job
We don't post flat prices for spring jobs because door size, spring count, and whether drums or cables need replacing alongside the spring all move the number. What we can tell you is that a single broken torsion spring on a standard double door, with no other hardware damage, is the more common and more affordable version of this call. Add a second failed spring, worn drums, or a bent shaft and the job grows.
Given that Coronado runs 11 miles from our shop, plan the call for when you notice the problem rather than after the door's been forced open a few more times - each cycle on a broken spring setup stresses the opener and cables further, and that's often where a simple spring job turns into a bigger one.
