A home inspector spends about four minutes on a garage door and writes up more findings per minute than almost anywhere else in the house. It is a mechanical system with published safety requirements, in plain sight, that nobody has looked at in a decade. It is easy scoring.
If you are selling, those findings arrive in a report, in front of a buyer, at the exact moment when everything on paper turns into a negotiation. Two of them are classified as safety defects, which is the category that gets money taken off rather than a shrug.
Here is what they look at, in roughly the order they look at it.
1. The photo eyes
Two small sensors near the floor on either side of the opening, facing each other. Since 1993, federal requirements have meant a residential opener has to have them. The inspector waves something through the beam while the door is closing; the door must stop and reverse.
Common write-ups: sensors missing entirely, sensors bypassed with a twisted pair of wires, sensors mounted too high — anything above about six inches off the floor defeats the point, because the thing you are protecting is a small child on the floor — and sensors that have drifted out of alignment and no longer see each other.
This is a safety defect. It is also, in most cases, a ten-minute alignment.
2. The mechanical auto-reverse
Separate from the photo eyes and a lot of people do not know it exists. The opener is also required to reverse when the door meets physical resistance, whether or not anything crosses the beam. Inspectors test it by laying a solid object flat on the floor in the door's path — traditionally a two-by-four — and closing the door onto it.
The door must reverse on contact. If it keeps pushing, sits on the obstruction, or grinds, the force setting is wrong.
Also a safety defect. And this one frequently fails because someone turned the force up to compensate for a heavy door instead of fixing the door.
3. The fire separation
Where a garage adjoins living space, the door between them is required to be fire-rated and self-closing, and the wall assembly intact. Inspectors check for a missing self-closer, a fire door propped open, or holes cut through the shared wall for cables and pipes.
Not our trade, but it is the item on the same page of the report and it is worth knowing it is coming.
4. The springs and cables
They look for the obvious: a gap in a torsion spring coil, frayed cable, a cable that has jumped its drum, and — on older doors — extension springs with no containment cable running through them. That last one matters. An extension spring that fails without a containment cable becomes a length of steel travelling at speed across a garage. Inspectors flag it every time, and they are right to.
5. Balance and general condition
Some inspectors pull the release and check whether the door stays put at waist height. Many note binding, rust, missing hardware, a bottom seal that no longer touches the floor, rot on a wooden door, and any panel that is visibly distorted.
The bottom seal is the one people are surprised by. It is a cheap strip of rubber and it turns up on reports constantly, usually alongside a note about rodent entry.
6. The opener installation itself
Wall button height — required to be high enough that a small child cannot reach it and positioned where the door is visible from it. An emergency release cord that is present and reachable. And, more often than you would think, an opener plugged into an extension cord, which is a write-up in itself.
What this actually costs you if you leave it
Not the repair. The negotiation.
A buyer's agent reading "garage door safety reverse inoperative — safety defect" does not price the ten-minute alignment. They price the uncertainty, and they price it in thousands, because nobody on that side of the table knows whether it is a sensor or an opener. A short list of small mechanical findings also does something less measurable: it suggests the rest of the house has been maintained the same way.
The same findings, fixed in advance with an invoice attached, are worth nothing on the report and quite a lot at the table.
The pre-listing version, which takes an evening
- Test the photo eyes. Close the door and put a foot through the beam. It must reverse. Check both sensor lights are steady, not blinking, and that neither is mounted more than six inches up.
- Test the mechanical reverse. A block of wood flat on the floor, close the door onto it. It must reverse on contact.
- Look at the springs. Any gap in the coil is a repair, not a check.
- Look at the cables where they wind onto the drums. Fraying or slack is a repair.
- Check the bottom seal sits flat on the floor along its whole width.
- Pull the release and lift by hand. If it does not stay at waist height, the balance is off, and that is what will fail the reverse test.
Anything on that list that is not a spring or a cable, you can very likely handle yourself. The springs and cables are the two you should not.
If you are buying rather than selling
Read the garage door section of the report closely and separate the two kinds of finding. "Safety reverse inoperative" and "no containment cables" are real and should be fixed before anybody parks in there. "Bottom seal deteriorated" and "surface rust noted" are a Saturday and a trip to the hardware store.
Both appear in the same font, which is how a hundred-dollar list becomes a five-thousand-dollar credit.
The unhelpful truth
Most garage door inspection findings are alignment, force settings, a seal, and a set of rollers. Almost none of them are a door.
We would rather tell you that now than after somebody has already knocked the price down over it.
Garage Door Doctor’Z · (833) 991-3899 · doctorzgaragedoor.com
CSLB C61/D28 · Lic. 1138150 · Serving the Sacramento Valley since 2018.
