A standard 10,000-cycle torsion spring lasts 7 to 10 years in most of San Francisco. In the fog belt, meaning the Outer Sunset, the Outer Richmond District, and anywhere the marine layer parks daily, we routinely see the same spring fail in 4 to 6 years. Salt in the fog pits the steel. A high-cycle, corrosion-resistant spring adds from $60 and usually pays for itself out here.
Our shop is at 1726 Great Hwy, a block from the ocean, so we answer "how long will these springs last?" from our own service records, not a national chart. The answer depends on two things: how many times a day your door moves, and how far you live from the water. Here's the math.
Springs age by the cycle, one full open and close, not by the calendar. The standard residential torsion spring is rated for about 10,000 cycles. Divide that by your household's use:
Notice the "in theory." Those numbers assume the steel stays healthy for every one of those 10,000 flexes. In most of the city it roughly does. Within a mile or so of Ocean Beach, it doesn't, and that's the whole story of the next section.
A torsion spring is a long coil of high-carbon steel wire that twists under heavy tension every time the door moves. Fog off the Pacific carries dissolved salt. When it condenses on that wire night after night, it eats microscopic pits into the surface. Each pit is a stress point, a tiny notch where the twisting force piles up instead of spreading evenly along the wire.
So the spring doesn't rust through like an old fence. It fails early, by fatigue. A crack starts at one pit, grows a little with every cycle, and one cold morning the coil lets go with a bang. A spring that would deliver its full 10,000 cycles in Noe Valley might crack at 5,000 or 6,000 on the Great Highway. Same part, same door, half the life. Oiling the springs a couple of times a year slows this down. It can't stop it.
The fog belt isn't one climate. Salt exposure falls off fast as you move inland, and hardware life follows:
This is why we stock coated and galvanized hardware on every truck that works the Sunset District and the Richmond District. The west side burns through builder-grade parts faster than anywhere else in San Francisco.
Springs rarely fail without notice. The notice is just easy to ignore:
Catch it at this stage and spring replacement is a scheduled daytime job. Miss it and it's a 2 AM call with your car trapped inside.
When springs get replaced, you can step up from the standard 10,000-cycle spring to a 20,000 or 25,000-cycle version built from thicker or better-protected wire. The upcharge is from $60 over the standard spring, depending on your door's size and weight.
Compare that to the alternative: a second spring replacement from $189 a few years sooner, another service visit, and whatever day the failure decides to claim. If your door sees four or more cycles a day, or you live west of Sunset Blvd, the upgrade is close to a coin flip in pure dollars and a clear win once you count the hassle. For a light-use door in the Mission or Bernal Heights, the standard spring is fine. We'll tell you which side of the line you're on. Full pricing is in our San Francisco garage door repair cost guide.
On a two-spring door, yes, almost always. Both springs went in the same day, have flexed the same number of cycles, and have breathed the same salt air. When one fails from fatigue, its twin is usually within months of the same. Replacing the pair in one visit (from $320) costs less than two separate single-spring jobs, and the door ends up balanced on two fresh springs instead of one new and one dying, which is easier on the opener too. Details on the failure itself are on our broken spring repair page.
Count your daily cycles, know your distance from the ocean, and spec the spring to match. If you're not sure what's on your door now or how much life it has left, we'll take a look. Call (415) 494-4774, 24/7. Bayside damp does the same thing to springs in Richmond, CA, and our second office at 3701 Barrett Ave answers at (510) 426-9500.
Alfonso Garage Door offers true 24/7 service across San Francisco and the Bay Area — call (415) 494-4774 or book online.
Yes. A light coat of garage-door lubricant on the spring coils two or three times a year puts a barrier between the steel and the salt-laden fog, which slows the pitting that starts fatigue cracks. It can't reverse existing corrosion or make a coastal spring last like an inland one, but on the west side it's the cheapest lifespan extension there is. Spray the coils lightly and wipe off drips. Don't soak them.
Usually you can't just read it. Most springs carry no cycle label, and installers rarely leave paperwork. What we do is measure the wire diameter, inside diameter, and length of the spring, which together determine its cycle rating for your door's weight. If your springs came with the house or a previous owner, assume standard 10,000-cycle hardware. That's what builders and most repair companies install by default.
Everything steel on the door ages faster near the beach. Lift cables are the most visible casualty. You can see fraying and rust bloom at the bottom brackets where spray and moisture collect. Roller stems, hinges, and track hardware pit and seize too. That's why on Outer Sunset and Outer Richmond District jobs we check the whole hardware set when a spring fails, and why galvanized or coated replacements are the right spec within a mile or so of the water.
