Most houses in this service area went up between 1938 and 1988, with the median year sitting at 1962. That matters more than people think, because a door on a house from that era usually rides on hardware nobody manufactures new anymore - original torsion springs, steel track that's been reshaped a dozen times, rollers that were never sealed. Across the 52 named neighborhoods in this footprint, the stock leans hard into 1960s and 70s construction, so a two-car opening built to that decade's framing doesn't behave like a door installed last year.
A grinding sound low in the cycle usually means a roller with a dead bearing, dragging metal on metal. A rhythmic thump as the door opens is often a bent track section flexing back into place. A loud bang followed by the door refusing to move is almost always a broken torsion spring - don't put your hands anywhere near it. A high-pitched squeal that fades once the door's warm is normal old-hardware behavior; it's not urgent, but it's not nothing either.
The honest limitation: we can guess a lot from a description over the phone, but we can't tell you for certain what's wrong without seeing the door move. Some sounds mean five minutes of lubrication. Some mean a torsion spring that could take a finger off if you touch it wrong.
San Francisco sits in a mild temperate band, which is a break in one sense: you're not getting the deep freeze-thaw cycling that snaps brittle steel in colder markets overnight. Springs here don't usually fail because of a sudden cold snap the way they do somewhere with real winters.
What the mild climate does instead is quieter and slower. The fog and steady damp keep moisture working on unlubricated hardware year-round, not in one dramatic season but continuously. Rollers that would dry out and squeal in a drier climate instead pick up a fine layer of surface rust that changes the sound of the door before it changes how it moves. On a house built in the 1962 median range, that means the original track brackets have had six decades of that slow damp cycle to work on the mounting bolts.
The noise to listen for here isn't a sharp crack from thermal shock - it's a low, steady grind that gets worse over weeks, not hours. That's corrosion working on a bearing surface, not a sudden failure. Catching it at the grind stage, rather than the seize stage, is usually the difference between a lubrication and roller job and a full track replacement.
What a repair costs on a door like this depends less on the door's size and more on its age. A house built anywhere near the 1962 median is more likely to need a part that isn't sitting on a shelf - an odd-length torsion spring, a track profile that isn't the current standard width. That search adds time to a job that would otherwise be quick.
With 449,915 households and 167,337 owner-occupied houses across this service area, a large share of the doors we get called out to are original to homes built decades before rolling steel and standardized torsion springs took over. On those doors, patching one part often just moves the failure point to the next original part in line. We'll tell you flat out when a door has more original hardware left to fail than it has life left in it - replacing the whole system is sometimes the cheaper decision over five years, even though the invoice is bigger on the day.
We don't quote a number without seeing the door. A door with a bent track and a dead spring is a different job than a door with just a dead spring, and the parts search on older hardware can go either way once we're actually in the garage.
Because this area sits in a mild temperate band rather than one with sharp seasonal swings, you don't get the classic January-spring-failure pattern that shows up in colder markets. What you get instead is a flatter curve - problems that build slowly across the damp months rather than arriving all at once in one bad week.
The practical version: check your hardware on a schedule instead of waiting for a season to remind you. On original 1960s-era track and rollers, a light lubrication pass and a look at the mounting bolts once or twice a year catches the slow corrosion before it turns into a grind you can hear from the street. Owners here tend to notice the sound change gradually - quieter operation slowly getting louder over a month or two - rather than a door that suddenly stops working overnight.
One thing worth saying plainly: we're not going to tell you your door needs service every three months just to get a truck out. If the door runs quiet and closes level, leave it alone. If it's started making a new sound in the last few weeks, that's the window where a small job stays small.
That's almost certainly a broken torsion spring. On houses in this area built anywhere near the 1962 median, that spring is often original or an old replacement, and it's under enough tension to cause real injury. Don't try to open the door manually or touch the spring. Call it in and keep the area clear until someone can look at it.
Even though San Francisco doesn't get hard freezes, the steady fog and moisture here work on unlubricated rollers and hinges over time, and that shows up as a squeal that's worse in damp conditions. It usually means lubrication is overdue, not that a part has failed. Left long enough, that surface rust does start affecting bearing life.
Not always, but it's the most common cause on older track systems in this area. It can also be a bent track section or a bracket that's worked loose over decades of use. The only way to tell for sure is to watch the door cycle and see exactly where along the track the sound starts.
Depends on how much original hardware is left. If the spring, track, and rollers are all original to a house from the 1960s or 70s, patching one part often just shifts the next failure a few months down the line. We'll tell you honestly if replacement makes more sense than another repair.
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