The overhead garage door is the largest moving object in a home, driven by springs under extreme tension and, usually, a motorized opener. Modern openers must reverse automatically when the door hits something, and must have an external sensor (the little photo eyes near the floor of the tracks) that stops the door if anything crosses its path.
$350 to $700 to replace an opener installed; $200 to $500 spring/cable repairs; $1,500 to $5,000+ new doorAddress soonInteriorExterior
The quick answer
The overhead garage door is the largest moving object in a home, driven by springs under extreme tension and, usually, a motorized opener. Modern openers must reverse automatically when the door hits something, and must have an external sensor (the little photo eyes near the floor of the tracks) that stops the door if anything crosses its path.
Openers without working entrapment protection have killed children, which is why the US CPSC required auto-reverse on every opener made after January 1, 1991, and an external sensor (photo eye or door-edge sensor) from 1993 on. An opener with no photo eyes is a pre-1993 unit that should be replaced, not adjusted. Springs and cables under tension are also a common DIY injury; they're a pro repair.
How to spot it
Look for the photo-eye sensors near the floor on both door tracks, none visible means an old opener. Check for frayed cables, stretched or rusted springs, cracked or delaminating door panels, and a door that won't stay half-open (spring tension is gone). The classic test: lay a 2×4 flat under the closing door, it should reverse on contact.
What it costs
A new opener runs $350 to $700 installed; spring or cable repairs $200 to $500; a new double door $1,500 to $5,000+.
What to do
Address soon. If the opener predates the sensor era or fails the reverse test, replace it, it's cheap insurance for kids and pets. Have springs and cables handled by a garage-door pro, never DIY.
Education and triage, not a home inspection. Casaroo flags what's visible, missing sensors, worn hardware, an aging door. A garage-door professional confirms and repairs.
Common questions
What is Garage door & opener safety?
The overhead garage door is the largest moving object in a home, driven by springs under extreme tension and, usually, a motorized opener. Modern openers must reverse automatically when the door hits something, and must have an external sensor (the little photo eyes near the floor of the tracks) that stops the door if anything crosses its path.
Why does it matter for home buyers?
Openers without working entrapment protection have killed children, which is why the US CPSC required auto-reverse on every opener made after January 1, 1991, and an external sensor (photo eye or door-edge sensor) from 1993 on. An opener with no photo eyes is a pre-1993 unit that should be replaced, not adjusted. Springs and cables under tension are also a common DIY injury; they're a pro repair.
How can I spot it?
Look for the photo-eye sensors near the floor on both door tracks, none visible means an old opener. Check for frayed cables, stretched or rusted springs, cracked or delaminating door panels, and a door that won't stay half-open (spring tension is gone). The classic test: lay a 2×4 flat under the closing door, it should reverse on contact.
How much does it cost to fix?
A new opener runs $350 to $700 installed; spring or cable repairs $200 to $500; a new double door $1,500 to $5,000+.
Last reviewed 2026-07-10.
This guide is general education, not a home inspection and not advice for your specific property. Always
consult the appropriate licensed professional, and get a licensed home inspection before you remove conditions
or buy. Cost ranges are 2026 estimates that vary by region, size, and access; confirm specifics with a
qualified professional.