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Red Flags When Hiring a Pro: What Reddit Says

Reddit threads on hiring contractors, mechanics, dentists and pet sitters point to the same red flags: pressure to decide now, vague quotes, big upfront payments and a pro who can't or won't explain the work. People add "Reddit" to a search because they want warnings from people who've been through it. So we read eight threads to see which red flags come up again and again, and which ones people actually argue about.

Red flags when hiring a contractor

Availability, deposits and permits

In r/homeowners, a person new to an area asked "What are some red flags when hiring a general contractor?". The most detailed answer listed several warning signs:

  • Availability. Good contractors are usually booked out. In the commenter's words: "If they're available as soon as you make a deposit, there's a reason for it."
  • Permits. "If permits are required they pull them."
  • Payment. For anything substantial, don't make large payments up front. The commenter said a reliable contractor will have a payment schedule tied to progress and milestones.
  • Pricing. If one bid is far lower than the others, the contractor may be cutting corners.
  • References. Ask for references and make sure they match the kind of work you're hiring for.

Another commenter, in a reply that drew more votes than the list itself, said a contractor who called ahead to say he'd be late stood out because he communicated. Responsiveness is a sign, good or bad.

The unusually low bid

In r/HomeImprovement, a poster whose family's contractor was arrested asked for tips on vetting people better: "Welp. Today the contractor was arrested. Any tips on how to vet people better?". One commenter wrote that the first red flag should have been how cheap the bid was, adding that a few of the jobs alone would have cost far more than the whole-house price quoted.

Red flags people disagree about

In "What is a big red flag for you when interviewing contractors?", the poster said a lack of modesty, such as showing up in a very expensive truck, was a red flag for them. Several replies pushed back, with one asking why the type of car someone drives matters. Other commenters named different signs: not being on time, and a written estimate padded with boilerplate but thin on detail about the proposed work.

Takeaway: be wary of treating one signal as proof. Look for several together.

Red flags when hiring a mechanic

In r/AskReddit, a mechanic-focused thread asked: "Mechanics of Reddit, what are the biggest signs a shop is a bad choice, such as being scammed or hustled into fixing things that don't really need fixed or bad mechanics?". One heavily upvoted answer was simple: "If they tell you something needs fixed/replaced, ask them to show you."

Commenters also said:

  • A good mechanic can explain in plain terms why something is a problem, and a shop that can't is a warning sign.
  • You can ask for the old parts back.
  • Be wary of shops that advertise a very cheap basic service plus a "100 point inspection," since the goal may be to upsell you.
  • Photograph a part like your air filter before service, because one commenter said some shops show a dirty filter that isn't yours.
  • Ask for something to be fixed that you know doesn't need it. An honest mechanic will tell you it doesn't.

Red flags when hiring a dentist

Two threads covered upselling at the dentist, one from patients' side and one from a dentist's.

In r/AskReddit, "Dentists of reddit, what are some red flags people should be aware of at dental clinics?", the top comment described a children's dental office with a flashy lobby, a long list of work needed "right away," and a staff member dedicated to financing plans. The commenter said a second dentist told them none of that work was necessary. Another commenter said an office offering free whitening found 11 cavities, and their regular dentist later found none.

In r/Dentists, a private-practice owner posted "Red Flags: How to spot an upsell at the dentist". The list included:

  • Calling a stable spot an emergency when nothing has changed on the X-ray.
  • Pushing deep cleanings for healthy gums.
  • Replacing working fillings just because they're old.
  • Making it hard or expensive to transfer your X-rays for a second opinion.
  • Pushing financing or "today only" discounts before the doctor finishes explaining the diagnosis.

Several dentists in the replies agreed with the list.

Red flags when hiring a pet sitter

In r/petsitting, "First time hiring a dog sitter: what to ask?" drew questions rather than warnings. Commenters suggested asking about experience, whether the sitter is insured and bonded, and whether they have animal first aid training. One suggested asking for a couple of clients' phone numbers. A sitter who can't answer these is worth a second look.

Another thread, "Sitter Red Flags?", was started by a pet sitter asking what other sitters look for when hiring a new sitter. It's a reminder that red flags are debated. Several sitters said they don't have a website or social media because their clients come by word of mouth, so a missing website isn't a warning sign by itself.

What the red flags have in common

Across trades, the same themes kept coming up:

  • Pressure. Decide now, pay now, "today only."
  • Vagueness. A quote that lacks detail, or an explanation that doesn't make sense.
  • No proof. A pro who won't show you the part, the X-ray, a reference or a license.
  • Money up front. Large deposits before work starts.
  • Poor communication. Slow replies before you've even hired them.

None of these needs a special tool. It's about asking and noticing. What helps most is knowing someone who has already hired the pro.

Where a recommendation from your network helps

A Reddit thread is a good checklist, but a username can't tell you how they know a pro. A recommendation from someone in your network can. You can ask what they hired the pro for, whether the price held and whether they'd hire them again.

MY PRO: TRUSTED PROS® is a social & professional networking app with the tagline Word of mouth, made visible™. Pros are promoted by their real clients, and you see pros promoted by people in your own network, up to second-degree connections. You can see who vouches for a pro and how you're connected before you reach out. It won't replace checking a license or getting a written estimate, but it gives you a head start.

MY PRO: TRUSTED PROS® is launching in November 2026.

FAQ

What are the biggest red flags when hiring a contractor?

In the threads we read: a contractor who's available right away and wants a deposit, a bid far lower than the others, no permits pulled when required, vague written estimates and slow communication.

How can I tell if a mechanic is trying to upsell me?

Commenters recommended asking the mechanic to show you what needs fixing, asking for the old parts back and being wary of a very cheap advertised service that comes with a long upsell inspection.

What are red flags at the dentist?

A dentist in r/Dentists listed urgent claims with no change on the X-ray, deep cleanings for healthy gums, replacing working fillings just because they're old, barriers to transferring X-rays and sales pressure before the diagnosis is explained.

What should I ask a pet sitter before hiring?

Commenters suggested asking about experience, insurance and bonding, animal first aid training and client references.

Is one red flag enough to walk away?

Not always. Redditors disagreed on some, such as an expensive truck or a missing website. Look for several signs together, and ask people you know about the pro.

Threads we read

Follow along

MY PRO: TRUSTED PROS® is launching in November 2026. Follow @mypro.app on Instagram for more.