How to Choose a Tree Service in the Denver Area

Hiring a tree service isn’t like hiring someone to mow the lawn. Tree work involves chainsaws, heavy limbs, climbing, and often your roof, power lines, and your neighbor’s fence. The difference between a professional crew and a truck with a chainsaw can be thousands of dollars in damage — or worse. Here’s how Denver-area homeowners can sort the pros from the risks before signing anything.

Ask for the license

The City of Denver requires tree contractors to be licensed, and several metro cities have similar rules. A legitimate company will not hesitate to show you its license — if a contractor dodges the question or claims they “don’t need one,” that’s your answer.

If you’re in Aurora, Littleton, Englewood, Centennial, Highlands Ranch, or another suburb, a quick call to your city’s forestry or licensing office will tell you what’s required locally. Licensing doesn’t guarantee great work, but it filters out operators who won’t meet even the minimum bar.

Verify insurance — both kinds

This is the single most important check, because it’s the one that protects you. Ask for current certificates of two separate policies:

• General liability — covers damage to your house, garage, fence, car, or the neighbor’s property if something goes wrong.
• Workers’ compensation — covers the crew if someone is injured on the job.

Why it matters: if an uninsured worker is hurt in your yard, the injured person’s costs can land on the homeowner. And tree work is genuinely dangerous — it’s regulated under federal OSHA rules, and the industry follows a national consensus safety standard (ANSI Z133) written specifically for pruning, removal, and brush work. Companies that carry real insurance and follow real safety standards charge more than a guy with a ladder, and that’s exactly what you’re paying for.

Don’t just take “yes, we’re insured” at face value. Ask for the certificates. A reputable company can email them the same day, and you can call the insurer listed to confirm the policy is active.

Ask about credentials

The credential worth asking about is ISA Certified Arborist — issued by the International Society of Arboriculture. Earning it requires documented field experience and passing an exam covering tree biology, pruning, safety, and diagnosis, and keeping it requires continuing education.

Not every person on a crew needs the credential, but a company with a certified arborist on staff (or one who assesses your trees and writes the plan) is far more likely to prune correctly, spot disease or structural problems, and tell you honestly whether a tree needs removal or just care.

Get a written quote — and know what it should include

Verbal ballparks are worthless when the crew shows up. A good written quote spells out:

• Scope — exactly which trees, which limbs, removal vs. pruning, and how close to structures or lines.
• Cleanup — is hauling away wood and chipping brush included? Is wood left stacked, or removed entirely?
• Stump — stump grinding is usually a separate line item. If it’s not mentioned, assume it’s not included and ask.
• Timeline — start date, expected duration, and weather contingencies.
• Price and payment terms — a deposit may be reasonable for large jobs; full payment up front is not.

If two quotes are far apart, the detail in the written scope usually explains why.

Know the red flags

Some warning signs come up again and again, especially after Colorado’s wind and snow storms:

• Door-knockers after a storm. Storm-chasing crews appear fast, work fast, and disappear faster. Damaged trees attract them.
• Pressure to decide today. “This price is only good right now” is a sales tactic, not arboriculture.
• Cash in full, up front. Pay meaningful money only as work is completed.
• Recommending topping. Cutting a tree’s crown flat (“topping”) stresses and disfigures the tree, encourages weak regrowth, and is rejected by professional standards. Anyone selling it is telling you they don’t know trees.
• No physical address or local track record. A real company can tell you where it’s based and point to work in your area.

Why the cheapest bid often costs the most

A lowball bid usually subtracts something: insurance, licensing, trained climbers, cleanup, or the stump. If an uninsured crew drops a limb through your roof, the “savings” vanish instantly — and you may be the one paying. If bad pruning weakens a mature shade tree, you can lose an asset worth thousands in property value that takes decades to replace. Compare bids on what’s included, not just the number at the bottom.

Get quotes and compare

Get two or three written quotes, ask each company the same questions — license, both insurance certificates, arborist credentials, what’s included in cleanup and stump work, timeline — and compare answers side by side. The right company answers all of them without flinching.

If your trees are in the Denver South Metro area, you can request a free quote and use this checklist on us, too. That’s how it should work.