A lot of homeowners come to us after a bad experience with a different tree company — usually one of two stories. Either someone showed up unannounced and said a healthy-looking tree “had to come down right away,” or a quote on the phone turned into a much bigger bill once the crew was already on-site. Both of those situations are common enough that they show up constantly in homeowner forums, and both are avoidable if you know what to check before you hire anyone. This page is the honest version of that checklist — not a sales pitch, just what actually separates a legitimate tree service from one you should walk away from.
Start With Insurance and Licensing, Not the Estimate
Before you talk price, ask for proof of current general liability insurance and workers’ compensation coverage. Tree work is genuinely dangerous — crews work with chainsaws, heavy equipment, and large loads overhead, often near power lines or a neighbor’s property. If a worker is hurt or your property is damaged and the company doesn’t carry real coverage, you can end up responsible for costs that have nothing to do with the actual tree work you hired for. A company that hesitates to provide proof of insurance, or gets vague when you ask, is telling you something important.
Ask Specifically About Arborist Certification
“Licensed and insured” is the bare minimum, not the differentiator. The more useful question is whether the person assessing your tree is an ISA-certified arborist — trained specifically in tree biology, diagnosis, and structural assessment, not just cutting and hauling. That distinction matters most in exactly the situation where it’s easiest to get taken advantage of: deciding whether a tree genuinely needs to come down, or whether it can be treated and saved. A company built around removal volume has less incentive to tell you a tree is fine. An arborist’s job is to give you an accurate diagnosis either way.
Insist on a Written Estimate, Priced by the Job
A verbal quote over the phone, before anyone has actually looked at your tree, isn’t a real estimate — it’s a guess designed to get a truck in your driveway. Legitimate tree companies price by the job after an on-site assessment, not by a vague hourly day-rate that can balloon once work starts. Get the estimate in writing, including what’s covered (debris removal, stump handling, cleanup) and what isn’t, before you agree to anything.
Be Wary of Door-to-Door Solicitation
If a company shows up unannounced and tells you a tree on your property needs immediate work, treat that as a reason for caution, not urgency. Legitimate tree companies generally don’t need to go door-to-door manufacturing demand — they’re booked from referrals, reviews, and search. That doesn’t mean every door-to-door contact is a scam, but it does mean you should get a second, independent opinion before agreeing to same-day work from someone who showed up uninvited.
Ask Directly Whether They Top Trees
Topping — cutting main branches or the crown down to stubs — is one of the most damaging things that can be done to a tree, and it’s also one of the fastest, cheapest jobs for a crew to perform. That combination is exactly why it still happens: it’s quicker and easier to top a tree than to prune it properly, even though topping leaves the tree weaker, uglier, and more vulnerable to disease and structural failure for years afterward. Ask any prospective tree service directly whether topping is something they’d recommend or perform. A company that pushes back on the practice understands tree health. A company that offers it as a quick fix is optimizing for their time, not your tree’s long-term health.
Get a Second Opinion for Any Major Removal
If you’re told a large, mature tree needs to be removed and the cost is significant, it’s worth getting a second assessment, especially if the first opinion came from an unsolicited visit or a single rushed quote. Reasonable tree professionals disagree sometimes — trees aren’t always a clear-cut case — but a second opinion either confirms the first one or gives you the information to ask better questions.
What red flags should make me walk away from a tree service?
Refusing to provide proof of insurance, pushing a same-day decision on an unsolicited visit, quoting only a vague phone estimate, defaulting to tree topping as a solution, and asking for full payment upfront before any work begins are the clearest warning signs. Any one of these alone is worth pausing on; more than one is a reason to call someone else.
Is it normal for a tree company to ask for payment before starting work?
A reasonable deposit for a large job is fairly common in the industry, but full payment upfront, especially from an unsolicited or rushed sales visit, is a pattern worth being cautious about. A written estimate should also spell out the payment structure so there are no surprises.
How do I know if a tree company is actually qualified, not just experienced?
Experience matters, but ask specifically about ISA arborist certification, request proof of insurance, and ask how they price and document jobs. A company confident in its qualifications will answer all of this directly and without hesitation.
If you want a straightforward, honest assessment of a tree in Islip — including a clear answer about whether it actually needs to come down — call (631) 663-7940.