What are the red flags of a bad tree service?

Most tree companies are honest. The bad ones cluster in a few recognizable patterns, and almost all of them show up before any money changes hands. Some flags below are deal-breakers on their own; others are worth a second look and a pointed question. The table sorts them.

Is it a red flag if a tree service knocks on my door?

Yes. A company with a chipper, a bucket truck, and insurance bills $150–$300 per hour and stays booked through referrals; it has no reason to send someone up your driveway. Door-knockers work a script: they just finished a job down the street, they noticed a dead limb over your roof, they can do it today for a special price. The pitch depends on speed; the moment you ask for a certificate of insurance and a written quote, it falls apart. Storm season brings the most of them, and the tricks specific to that moment are on how to avoid tree service scams after a storm. Take the card, say you will call, and run the ten-minute check on how do I know a tree company is legit? Most door-knockers do not survive it.

Why is cash only a warning sign for a tree service?

Because it means no record. A legitimate company runs a business account, takes checks and cards, and sends an invoice, partly because that is how it proves income and pays taxes and partly because that is how it gets paid by customers who dispute a bill. Cash-only companies are avoiding one or more of those things, and the ones they avoid most often are insurance premiums and payroll for workers' compensation. That is the risk that lands on you when a worker is hurt in your yard; see what happens if a tree service is not insured. Cash also leaves you nothing if the crew leaves the stump, breaks the fence, or never comes back.

What if a tree service offers to top my tree?

Decline, and cross the company off for any pruning. Topping means cutting the main limbs back to stubs to make a tree shorter. It is rejected by every arborist standard because the tree responds with weak, fast-growing shoots at each stub, the large open wounds invite decay, and within a few years the tree is taller, uglier, and more dangerous than before. A crew that suggests it either does not know this or is chasing a quick, easy cut, and it has no ISA Certified Arborist on staff. Why the practice is so harmful and what to do instead is on why topping a tree is bad.

How big a deposit is too big for tree work?

Anything over about a third. Many companies ask for no deposit at all on ordinary residential jobs; the crew comes, the tree comes down, you pay on completion. A demand for half, or for the full amount, before a truck has arrived is the single most common shape of a tree service scam, and in cash it is nearly unrecoverable. The same category includes the assignment of benefits: a form that hands your insurance claim to the contractor, letting them bill your insurer directly and keep the difference. Never sign one on the driveway. Pay the deposit by check or card, keep the balance until the yard looks the way the quote said it would, and match the invoice against the itemized quote you signed.

Are climbing spikes a red flag?

On a pruning job, yes, and it is one of the few flags you can see from the kitchen window. Spikes, also called gaffs, strap to the climber's legs and drive a steel point into the trunk with every step. On a tree being removed that does no harm. On a tree meant to live for decades, each hole is a wound into living tissue, and dozens of them invite decay and insects. Trained climbers ascend live trees on ropes and a harness. If you see spikes on a trim, stop the job and call the office. The full list of what to ask before the crew arrives, including who will be climbing and how, is on what questions to ask before hiring a tree service.

Not yet independently reviewed. General information, not legal or insurance advice. Figures are typical US ranges for planning purposes, not quotes.