Garage Door Safety Inspection Checklist — DIY in 15 Minutes
By Denver Garage Door Ltd — BBB accredited, serving Denver metro since 2011. Last updated: April 2026.
Your garage door is the single largest moving part of your home, and it’s usually hanging over the roof of a car. Worth checking every six months. This is the same checklist we run through on a professional tune-up — stripped down so you can do it yourself. If any item fails, it doesn’t mean panic; it means call us before the next hard freeze or before the kids use the garage again. Nothing here requires tools except a socket wrench for the hardware tighten.
1. Visual Inspection of Springs and Cables
With the door closed, look at the torsion spring(s) above the door. Are the coils evenly spaced, or do you see gaps? Any rust or broken coils? Now eyeball each lift cable along its length. Any fraying, broken strands, or rust near the bottom bracket? Gaps in a spring or fray in a cable means service soon — don’t wait.
Found something scary? Call (303) 335-5102 — same-day Denver safety inspection, written report, no pressure to upsell.
2. Check the Hardware
Walk along both tracks and the door itself. Are any bolts obviously loose? Any hinge bolts where you can see threads? A socket wrench (typically 7/16 or 1/2 inch) snugs everything down. Don’t over-tighten.
3. The Balance Test
Pull the opener release (red cord) to disconnect. Lift the door manually. It should lift smoothly and stay at halfway without falling or rising. If it falls, the springs are too weak. If it rises, too tight. If it’s so heavy you can barely lift it, a spring is broken — stop, don’t force it, call.
4. The Reverse Test (Auto-Reverse)
Lay a 2×4 flat on the ground where the door closes. Close the door with the opener. The door should hit the board and reverse back up automatically. If it doesn’t, the force setting on the opener is wrong or the auto-reverse mechanism has failed — both are safety-critical. Detailed opener service available.
5. The Photo-Eye Sensor Test
Start the door closing. Wave a long stick (broom handle works) across the path of the photo-eye sensors at the bottom of the tracks. Door should stop and reverse. If it doesn’t, sensors are out of alignment or failed. Check for two solid green LEDs on the sensors first.
6. Remote and Wall Button Test
Test every remote and the wireless keypad. If one is weak, swap the battery. If batteries are fresh and it’s still weak, the transmitter may need reprogramming or replacement. The wall button should work regardless.
7. Listen to the Opener
Run the door through a full open and close cycle. Listen for grinding, popping, or straining noises. A healthy belt-drive is nearly silent. A chain-drive has a rhythmic clink but shouldn’t grind. If something sounds off, note it — the description helps the tech diagnose before arrival.
8. Check the Seals
Bottom seal: any cracks, curling, or daylight at corners? Side seals: any gaps between the seal and the jamb? Top seal: any pulling away? All three make a difference, especially in a Denver winter. See bottom seal replacement and the full weatherproofing service.
9. Rollers, Hinges, and Bearings
With the door open, look at the rollers. Are they worn flat, cracked, or dragging? Are any hinges bent? The end bearings at each side of the torsion shaft should be clean and quiet — a squeal means they’re on their way out. Same for the bottom bracket, which should be free of rust and the bolts tight.
10. Reset the Opener’s Force Limits (If Accessible)
If your opener has adjustment dials or digital menu options for up-force and down-force, verify they’re not cranked too high. Too much force means the opener will not reverse on an obstruction. This is something we do during a tune-up but it’s accessible to most DIYers.
What to Do If You Find Something
Springs, cables, or hardware issues → call. These aren’t safe DIY. A failed reverse test → call, this is the most safety-critical item on the list. Seal replacement or roller swap → you can DIY if you’re handy, or we’ll handle it cheap. For pricing see the cost guide.
Local Service
Need a pro inspection instead? We do full 20-point tune-ups across Central, East, South, and West Denver, as well as commercial properties and multi-tenant gates.
Frequently Asked Questions
How often should I do this inspection?
Every six months for residential. Commercial doors should run a more formal inspection quarterly or monthly depending on use — see our preventive maintenance program.
Is the auto-reverse test really necessary?
Yes. A failed auto-reverse has killed kids. It’s the single most important item on the list.
Can I fix a failed photo-eye sensor myself?
Alignment, yes. Replacement, if you’re comfortable with wiring. A new sensor kit is cheap and takes 20 minutes.
What if my door won’t balance — can I adjust the springs myself?
No. Torsion spring tension can injure you seriously. Call for a tech.
Do you offer a paid version of this inspection?
Yes — a $90-ish tune-up covers every item on this list plus lube and hardware tightening. Call to book.
Schedule an inspection: Call (303) 335-5102 or book online. Tune-ups fill fast every fall — book early.