Most of the houses in this service area went up between 1938 and 1988, with the median build year sitting around 1962. That matters more than people think, because the garage door seals on a house that age were spec'd for a different set of assumptions than what a door gets today. Across the 52 named areas that make up the wider service area, the stock is mostly 1960s and 70s construction - track systems, jamb details, and astragal seals that were standard for their decade and have been quietly failing ever since.
What you notice first isn't usually the seal itself. It's a line of cold air along the floor of the garage, a damp smell that doesn't go away, or a gap you can see daylight through when the door's shut. On a house from this era, the bottom seal has usually hardened and pulled away from the slab, and the side seals along the jamb have shrunk enough that they no longer sit flush. None of this is dramatic. It's just slow, and it's been going on for longer than most owners realize.
We don't replace seals as a blanket policy on every job - if the door and track are sound and the seal is the only issue, that's a smaller job than people expect, and we'll tell you that up front rather than talk you into more.
San Francisco sits in a mild temperate band, and that's exactly what makes seal failure sneaky here. This isn't a climate that cracks rubber with summer heat or splits it with a hard freeze. It's a climate that stays damp, cool, and foggy for long stretches without ever swinging hard in either direction - and that kind of steady moisture doesn't break a seal, it rots it.
Rubber and vinyl weatherstripping breaks down under UV and thermal cycling in most of the country. Here, the bigger enemy is sustained dampness working into the seal's compound over years, softening it in some spots and letting it go brittle in others. The result is a seal that looks intact from a few feet away but no longer makes real contact with the slab or the jamb. Draughts get in along the bottom track first, then along the sides where the door meets the frame.
Because the temperature swings are mild, owners here often don't get the obvious warning signs - the visible cracking or gaps you'd see somewhere with real winters. The seal just quietly stops doing its job, and the first sign is often a colder, damper garage than there used to be, not a door that looks obviously worn.
We're not going to put a number here that isn't grounded, so we'll say what actually drives the cost instead. A straight seal swap on a door where the track, springs, and opener are all sound is a small job. It gets bigger fast once the bottom seal has been letting water sit against the slab long enough to warp the bottom panel, or once the side seals have been gone long enough that moisture has gotten into the track hardware.
Across this service area - 449,915 households, with 167,337 of those owner-occupied houses - the median household income runs around $152,131. That context matters less for what the job costs and more for how owners here tend to approach it: most people want the job assessed properly before they hear a number, not the other way around.
The honest limitation here is that we can't quote seal or panel work sight unseen. A door built in the 1960s or 70s doesn't always use standard modern hardware sizes, and the only way to know what a specific door needs is to look at it in person.
There isn't a hard freeze-thaw season here the way there is inland, so the usual seasonal advice about garage doors doesn't map cleanly onto this climate. What does map is the fog. The wetter, foggier stretch of the year is when a failing seal actually shows itself - that's when the draught along the bottom of the door turns from a minor annoyance into a garage floor that's damp more mornings than not.
Houses built in the 1938 to 1988 range, which is most of this area, tend to have single-layer doors without much insulation value built in, so a compromised seal has an outsized effect relative to what it would do on a newer insulated door. If your garage backs onto a bedroom or a laundry area, that's the time of year you'll feel it most.
We'd rather get a call before the wet stretch than during it - not because the job changes, but because a seal that's already letting water sit against a wood panel for a season is a different job than one caught early.
On houses built in the 1960s and 70s, which describes most of this area, the seal has usually hardened or shrunk over the decades even though it looks intact from a distance. San Francisco's steady damp works on rubber differently than a climate with hard seasonal swings - it degrades the seal's ability to sit flush rather than cracking it visibly.
Most of the time, if the track, springs, and panels are sound, it's a seal job, not a door replacement. We won't know for sure without seeing it - a door from this era can have panel warping from long-term moisture exposure that isn't obvious until someone's looking at it directly.
Before the wetter, foggier stretch of the year is better than during it. That's when a marginal seal actually starts showing itself as a damp garage floor or a cold draught along the bottom of the door, and it's easier to deal with before a season of standing moisture has worked into the wood or hardware.
Yes. Houses in this service area mostly date to 1938 through 1988, with a lot of stock from the 1960s and 70s specifically, and that generation of doors used different seal and track dimensions than what's standard today. We check the actual door rather than assuming a modern-size seal will fit.
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