When to Hire an Arborist for Tree Health
Table of Contents
Signs You Need to Hire an Arborist
Visible Disease and Pest Damage
Structural Problems and Safety Concerns
When to Call an Arborist Without Delay
Storm Damage and Hazardous Branches
Trees Near Your Home or Property
Arborist vs. DIY Tree Care: What You Should Know
What Happens During an Arborist Assessment
Before the Visit: What to Prepare
The On-Site Inspection
How Diagnosis Actually Works
What You Should Receive
Questions to Ask When Hiring a Tree Service
Credentials and Certification
Insurance and Liability
Written Estimates and Scope
Red Flags to Watch For
Comparing Estimates Fairly
Routine Tree Inspections and Seasonal Timing
How to Know When to Hire an Arborist for Tree Health
Frequently Asked Questions
Last Updated: October 18, 2026
Signs You Need to Hire an Arborist
The difference between a healthy tree and a hazardous one often comes down to early detection. At Anderson Tree Care, we've helped homeowners identify when professional help becomes necessary.
Trees send clear signals when they're in trouble. The trick is knowing what to look for and acting early.
Visible Disease and Pest Damage
Tree disease and pest damage are the most common reasons homeowners call a professional. Visible signs include discolored leaves, unusual spotting, peeling or oozing bark, and holes or tunnels in the trunk.
Look for these specific warning signs:
Leaves that turn yellow, brown, or red outside of fall
Canopy that thins out unexpectedly
Fungal growth, mushrooms, or shelf-like growths on the trunk
Pest damage doesn't always show up right away; by the time you notice holes or weak branches, the infestation may be advanced. A certified arborist can identify the pest or disease and recommend treatment.
Pro Tip Don't wait for damage to become visible across the entire tree. Early intervention when disease or pests first appear can save the tree and prevent expensive removal later.
Structural Problems and Safety Concerns
Structural defects are the second major reason to hire an arborist. These physical problems with the tree's form make it unstable or likely to fail.
Common structural issues include:
Cracks or splits in the trunk or major branches
Branches that cross or rub against each other
Weak branch angles that create V-shaped crotches instead of strong U-shaped ones
A leaning tree isn't always dangerous, many mature trees lean naturally. But one that recently started leaning, or leans toward a structure, needs professional assessment. A single dead limb is often just pruning work; widespread deadwood signals deeper stress.
When to Call an Arborist Without Delay
Some situations demand immediate professional attention. These aren't problems you should wait to address or handle yourself.
Storm Damage and Hazardous Branches
Call an arborist immediately after severe weather if branches are hanging over your home, garage, or power lines. Storm damage creates urgent safety hazards that professional equipment and training are designed to handle.
Situations requiring immediate action:
Large branches touching or hanging over your roof
Branches near electrical lines or power poles
Trees that have partially fallen or are leaning at an unusual angle
Watch Out Never attempt to remove large branches yourself after a storm, especially near power lines or structures. One mistake with a chainsaw or climbing can result in serious injury or property damage.
Trees Near Your Home or Property
Trees within 20-30 feet of your home, garage, fence, or other structures need professional attention if they show any signs of decline. The closer the tree, the more critical it is to manage risk proactively.
Priority situations for nearby trees:
Dead or dying trees within falling distance of structures
Trees with branches overhanging roofs or gutters
Trees whose roots may threaten foundations, driveways, or septic systems
A professional arborist can assess whether the tree can be safely maintained through pruning or whether removal is the better option.
Arborist vs. DIY Tree Care: What You Should Know
The line between DIY maintenance and professional work isn't always clear. Some tasks are safe for homeowners; others look simple but carry serious risk.
Safe DIY work includes:
Removing small dead branches (under 1 inch diameter) from lower limbs
Clearing fallen branches and debris
Watering young trees during dry spells
Work that requires a professional:
Climbing or working at height
Using chainsaws on branches above shoulder height
Pruning near power lines
The real difference comes down to equipment, training, and liability. A professional has climbing gear, rigging equipment, and insurance, and knows how to make cuts that promote tree health instead of creating entry points for disease.
What Happens During an Arborist Assessment
Most homeowners have never watched a tree assessment, so the process can feel like a black box. Understanding what a qualified arborist does, and what to prepare, makes the visit predictable and useful.
Before the Visit: What to Prepare
Before the arborist arrives, gather:
A timeline of changes. When did you first notice thinning, discoloration, or dieback? Did it follow a storm, drought, construction, or a new irrigation routine?
Site history. Have you regraded the yard, added fill soil, paved over roots, or installed a new septic line near the tree? Root-zone disturbance is one of the most common and least visible causes of decline.
Photos from prior years. Canopy photos taken from the same spot each season reveal gradual decline that's easy to miss day to day.
The On-Site Inspection
A thorough assessment typically moves from the whole tree to the details:
Site and root-zone review. The arborist looks at soil grade, drainage, mulch depth, compaction, and any excavation or paving near the trunk. Roots are assessed indirectly through crown symptoms, soil probing, and sometimes an air spade or root excavation on high-value trees.
Trunk and bark inspection. Cracks, seams, cavities, conks (shelf fungi), oozing, and bark separation are noted. A rubber mallet may be used to listen for hollow areas.
Branch structure and attachments. The arborist checks branch unions for included bark, codominant stems, and weak V-shaped crotches, and looks for cracks, hangers, and deadwood over targets.
Canopy and foliage. Density, color, dieback pattern, and the location of deadwood tell the arborist whether the problem is systemic or localized. Leaf symptoms, chlorosis, scorch, spotting, curling, are mapped to likely causes.
Pest and disease signs. Frass, exit holes, webbing, sticky honeydew, sooty mold, galls, cankers, and fungal fruiting bodies are identified and, where needed, sampled.
Target assessment. The arborist evaluates what the tree could hit, a house, garage, fence, driveway, power drop, or walkway, because risk is a function of both tree condition and what lies beneath it.
How Diagnosis Actually Works
Diagnosis is rarely a single glance. Arborists rule out the most common stressors first: drought, overwatering, compaction, planting depth, and root injury. Many “diseases” turn out to be environmental stress. Where a pathogen or insect is suspected, the arborist may recommend a lab sample or a follow-up visit during the active season.
Treatment decisions follow the diagnosis. Options generally fall into a few categories:
Cultural fixes, correcting mulch depth, irrigation, grade, or compaction
Pruning, removing deadwood, correcting structure, or reducing end weight on long limbs
Plant health care, targeted fertilization based on soil test results, not blanket feeding
What You Should Receive
Ask for a written report or estimate covering the diagnosis or suspected cause, the recommended action, the reasoning, and the priority level. If the recommendation is removal, a second opinion is reasonable for a high-value or historically significant tree.
Key Takeaway A strong assessment explains not just what is wrong but why, what options exist, and what happens if you do nothing. If you leave without those answers, ask for them before you sign anything.
Questions to Ask When Hiring a Tree Service
Credentials separate a qualified arborist from a general tree service, but the difference is only visible if you ask the right questions and verify the answers.
Credentials and Certification
Is there a certified arborist on staff, and will that person be on site? ISA certification requires passing an exam and maintaining continuing education.
What is the arborist's scope of practice? A certified arborist can assess and recommend; a certified tree worker or climbing specialist may perform the physical work. Confirm who is doing which part.
Does the company follow ANSI A300 standards? These consensus standards cover tree pruning, fertilization, and support systems. A company that references them follows a defined standard rather than habit.
Is the company licensed or registered where required?
Insurance and Liability
Can you provide a current certificate of insurance for both general liability and workers' compensation?
Are subcontractors covered?
Who is responsible if a limb damages my roof or a worker is injured? Get the answer in writing. A properly insured company carries the risk; an uninsured one may leave it with you.
Written Estimates and Scope
Will you provide a written estimate before work begins? Verbal quotes are difficult to compare and easy to dispute.
What exactly is included? Ask which trees, which limbs, the type of cut, whether debris is hauled away or chipped on site, and whether stump grinding is included or priced separately.
Is the price firm or an estimate? Clarify what could change it and whether you will be notified before any additional charge.
What is the payment schedule?
Red Flags to Watch For
No physical business address, no verifiable certification, or reluctance to provide insurance documentation
Comparing Estimates Fairly
Line up two or three written estimates side by side and compare scope, not just totals. One quote may include debris removal and stump grinding while another does not, making the lower number misleading.
Watch Out Never allow work to begin without proof of insurance and a written scope. If a provider cannot supply both, choose another provider, the savings are not worth the liability.
Routine Tree Inspections and Seasonal Timing
Regular inspections catch problems early, when they're easiest and least expensive to address. Most homeowners benefit from annual or biennial inspections, especially for mature trees.
Best times to inspect your trees:
Spring: Check for new growth, emerging pests, and winter damage
Summer: Assess overall health, water stress, and canopy density
Fall: Look for disease signs, pest activity, and structural changes
Winter: Evaluate branch structure and dead wood more easily without leaves
Seasonal timing matters. Pruning in late winter or early spring promotes healthy new growth; summer pruning is fine for maintenance but less ideal for major cuts; fall pruning can leave trees vulnerable to winter injury.
How to Know When to Hire an Arborist for Tree Health
The safest approach is to hire an arborist when you notice any change in your tree's appearance or health. Early intervention prevents small problems from becoming big ones.
Here's your decision framework:
Visible disease or pest damage → Call an arborist
Dead branches or declining canopy → Call an arborist
Tree leaning or structural cracks → Call an arborist
Branches near your home or power lines → Call an arborist
You don't need to be certain there's a problem to reach out. Anderson Tree Care offers estimates that explain what's needed and what options exist, so you can make the right decision for your trees and property.
Best For Homeowners with mature trees, properties near structures, or recent storm damage who want professional guidance on tree health and safety.
Frequently Asked Questions
What are the signs that a tree needs an arborist?
Watch for dead or dying branches, visible cracks in the trunk, unusual bark damage, fungal growth, pest infestations, or significant lean. Trees showing signs of disease, stress, or structural defects need professional evaluation. Storm damage, branches hanging over your roof or house, and trees growing too close to your home are also clear indicators to hire an arborist for tree health assessment.
When should I call an arborist instead of handling tree care myself?
Call an arborist when dealing with tall trees, hazardous branches, disease diagnosis, or work near structures or power lines. Arborist vs DIY tree care matters most when safety is at risk. Professional arborists have training, equipment, and insurance to handle complex situations safely. DIY care works for minor pruning on small, accessible branches only.
How often should a healthy tree be inspected by an arborist?
Mature trees benefit from professional inspection every 2-3 years or after severe weather. Newly planted trees should be checked annually for the first 3-5 years. More frequent inspections are needed if you notice changes in the tree's appearance, health decline, or structural concerns. Seasonal timing matters: spring and fall inspections help catch emerging issues early.
What should I know before hiring a tree service?
Ask about credentials, insurance coverage, and whether they carry liability insurance. Understand the scope of work, timeline, and whether they'll provide a written estimate.
When you're ready to protect your trees and property, Anderson Tree Care is here to help. We've spent over a decade working with homeowners across the region to keep their trees healthy and safe. Our team provides thorough assessments, clear recommendations, and professional work backed by full insurance and industry-standard practices. Call or text us for an estimate and find out exactly what your trees need.
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