Garage Door Technician Interview Questions to Ask Candidates (With What Good Answers Sound Like)

For contractors hiring garage door technicians onto their own crew. If you are a homeowner vetting a garage door company for a repair, this is not that list.

There is no license standing between most garage door candidates and your truck, so the interview does more work here than in the licensed trades. It has to find out two things the resume cannot: whether this person can reason from a symptom to a cause on a door they have never seen, and whether they are safe around a spring holding a couple of hundred pounds of stored energy. The questions below are built around those two things, and around telling an installer from a service tech, because both apply for the same posting.

First: decide what you're hiring for

Residential service, installation, install/sales, and commercial are different jobs. Pick the role, then pick six to eight questions. Ask everyone the spring safety questions regardless.

Diagnosis

“The opener runs, the door comes up a few inches, then stops and drops back down. It worked fine yesterday. What do you do first, and what do you not do?”

Why you're asking: The best question in the set for service roles, because the sequence separates trained technicians from people who have watched videos, and the wrong answer is the dangerous one.
What a strong answer contains: Looks at the spring from the floor before touching anything, because a door that lifts a few inches and reverses on the way up is the opener hitting its force limit against dead weight, and a broken torsion spring is the usual reason. Asks the customer about a loud bang, looks for a gap in the coils, checks that both cables are still on their drums. If the spring is intact, runs the balance test the right way: door closed, opener released, door lifted by hand to waist height, and it should stay put. Only once the door balances does the opener come into it. Says without prompting that photo eyes are not a suspect, because photo eyes only stop the door on the way down. Mentions that springs are rated for cycles, that the residential baseline is a 10,000-cycle spring, and that a two-spring door gets both springs.
What a memorized answer sounds like: “I'd bump the up-force and see if it makes it.” That is what a handyman does. Turning up the force drags dead weight the opener was never built to lift, strips the gear, and hides the failure until the door drops on something.

“A door closes partway and reverses, and the opener light flashes. Walk me through it.”

What a strong answer contains: Goes to the photo eyes: alignment, obstruction, sun glare, a wire pinched by something leaning on the track. Reads the flash count as the opener telling them which fault it saw. Knows the hold-to-close workaround exists, that it bypasses the safety beam, and that it is a stopgap to get the door shut with the doorway in full view rather than a fix.
What a memorized answer sounds like: Adjusts the down-force or the travel limit without ever looking at the sensors.

“Tell me about a call you misdiagnosed.”

What a strong answer contains: A specific door, what misled them, what they changed afterward.
What a memorized answer sounds like: Claims it has not happened.

Springs and safety

“Walk me through replacing a torsion spring, start to finish.”

Why you're asking: Listen for the order. The safety steps should arrive on their own, not when you ask about them.
What a strong answer contains: Measures the old spring for wire size, inside diameter, and length, and checks wind direction, rather than guessing from the door. Locks the door down with locking pliers on the track before tension comes off. Two properly sized winding bars, fully seated, standing to the side and never in line with the bar. Unwinds the old spring a quarter turn at a time. Winds the new one to the turn count for the door height, sets the cable tension evenly, then balance-tests before reconnecting the opener.
What a memorized answer sounds like: Skips the measuring, skips the pliers, or mentions a screwdriver anywhere in the answer. Any of the three ends the interview for a service or install role.

“What does an extension spring door need that a torsion door doesn't?”

Why you're asking: A short question with one right answer that most weak candidates do not have.
What a strong answer contains: A containment cable running through each spring, so a spring that breaks under load does not become a projectile. Adds that they check for it on every extension spring door they touch, because a lot of older doors were installed without one.
What a memorized answer sounds like: Does not know what a containment cable is, or treats it as optional.

“When do you replace one spring and when do you replace both?”

What a strong answer contains: Both, on a two-spring door, because the second spring has the same cycles on it and will go next, and explains it to the customer as a matched pair rather than as an upsell. Knows the cycle rating and can explain what a cycle is.
What a memorized answer sounds like: Whichever one the customer will pay for, with no explanation offered.

Openers and installation

“What do you test before you leave a new opener install, and how?”

Why you're asking: This is the liability question. UL 325 is the standard, but the answer you want is the test, not the citation.
What a strong answer contains: Photo eyes: break the beam while the door is closing and it has to reverse. Force reversal: a board laid flat on the floor under the door, and the door has to reverse when it contacts it, within a couple of seconds. Checks the manual release works, the door balances with the opener disconnected, and the travel limits are set so the door seals without slamming. Shows the homeowner the release and the sensors.
What a memorized answer sounds like: Runs the door up and down once and packs up.

“You're on a service call and the opener is twenty years old with no photo eyes at all. What do you tell the customer?”

What a strong answer contains: That an opener without external entrapment protection predates the standard and should be replaced rather than repaired, and says so as a safety recommendation with the reason attached, not a sales pitch. Repairs what they were called for if the customer declines, documents the recommendation, and does not defeat or bypass anything.
What a memorized answer sounds like: Either repairs it and says nothing, or refuses to touch it and leaves the customer with a door that does not work.

“What do you measure before you order a door for a replacement?”

Why you're asking: Excellent discriminator between installers and service techs.
What a strong answer contains: Opening width and height, headroom, side room, backroom, whether the opening is square and the floor is level, and what the customer has above the door that will be in the way of the track and the opener. Specifics, in a sequence.
What a memorized answer sounds like: Width and height.

The interview tells you how they talk. This tells you what they know.

Pair the conversation with a role-specific garage door assessment scored the same way for every applicant. Free trial, no card required.

Start Free Trial

Customer-facing judgment

“How do you explain a broken spring to a homeowner who wants to know why they can't just lift the door themselves?”

Why you're asking: Where most residential service hires actually fail. A technician who can set a spring and cannot explain one will get bad reviews for good work.
What a strong answer contains: A plain comparison the homeowner can picture, the safety instruction delivered as a favor rather than a scolding, and a check that it landed. Does not use the word torsion without translating it.
What a memorized answer sounds like: Either a lecture or a shrug.

“A customer asks whether they could replace the spring themselves with a kit they found online. What do you say?”

What a strong answer contains: Honest about the risk without being condescending, specific about what goes wrong, and respectful of the decision if they make it anyway.
What a memorized answer sounds like: Scoffs, or invents a made-up figure to scare them.

“How do you present repair versus replacement when replacement pays better?”

Why you're asking: A values question in technical clothing, and the one that matters most for install/sales roles.
What a strong answer contains: Gives the customer real information and real options, has a recommendation, does not manufacture urgency.
What a memorized answer sounds like: Either a pitch or a shrug. Which one is disqualifying depends on your model, and you should know which you are hiring for.

Their last shop

“What was your split between installs, residential service, and commercial?”

Why you're asking: The single most useful question on this page. Resumes flatten it and candidates routinely apply for the discipline they have done least.

“What would have kept you?”

Why you're asking: More revealing than why they are leaving.

“How were you dispatched and how was your work reviewed?”

Why you're asking: Tells you whether your operation will feel like a step up or a step down, which predicts whether they stay.

Questions worth skipping

Spring chart questions, like which wire size goes on a given door. The chart is on the truck. Ask how they measure a spring instead.

“Where do you see yourself in five years.” The honest answer is unknowable and the prepared one is worthless.

What the interview can't tell you

Interviews measure how well someone talks about garage doors. Some of your best candidates will be quiet, and some of the most fluent will be selling you a version of themselves. The spring questions are the exception: a wrong answer there is disqualifying whatever the delivery.

Pair it with something that measures capability directly: watching them set a spring in the shop, a working day, or a structured skills assessment.

Free interview scorecard

One page, grouped by role, space to rate each answer. Print it or save it as a PDF from your browser.

Open the scorecard

Frequently asked questions

How do I interview a candidate with no certification?

Most garage door technicians have none, so the interview and the skills test carry the weight a license carries in other trades. Ask why questions and sequence questions, and listen for whether the safety steps come out unprompted or only when you ask.

Should installers get different questions?

Yes. Weight toward reading the opening, balancing, and the entrapment test before leaving. A service tech gets the diagnosis and customer questions instead. Ask everyone the spring safety questions.

Who should run the technical portion?

A lead tech or service manager. They will hear the difference between a real answer and a rehearsed one, especially on the spring questions, where the wrong answer sounds confident.

How many questions should I ask?

Six to eight technical plus the last-shop questions fits forty-five minutes and leaves room for the candidate's own questions, which tell you a lot on their own.

Garage Door Technician Interview Questions to Ask Candidates