What Does an Arborist Do?
What certified arborists do, ISA certification explained, and when you need an arborist vs a tree service company.
Arborist Services
Certified arborists are tree care professionals trained in the science of planting, caring for, and maintaining trees. Their services include tree health assessments, disease and pest diagnosis, pruning recommendations, risk assessments for potentially hazardous trees, tree preservation during construction, and expert witness testimony in property disputes. They differ from general tree service companies in their depth of knowledge about tree biology and care.
ISA Certification
The International Society of Arboriculture (ISA) administers the most widely recognized arborist certification. To become ISA certified, candidates must have three or more years of tree care experience and pass a comprehensive exam covering tree biology, diagnosis, pruning, safety, and urban forestry. Certified arborists must earn continuing education credits to maintain their certification. This ensures they stay current with best practices.
When You Need an Arborist vs a Tree Service
You need an arborist when dealing with tree health issues (disease, pest problems, decline), before construction near valuable trees, for proper pruning of mature or specimen trees, for legal disputes involving trees, or for risk assessment of large trees near structures. A general tree service company is fine for routine trimming, straightforward removals, and stump grinding.
How to Find a Certified Arborist
Use our directory to search for ISA-certified arborists in your area. Look for the ISA Certified Arborist credential. Ask to see their certification card and verify it through the ISA website. A qualified arborist should carry professional liability insurance and be willing to provide references from recent clients.
Frequently Asked Questions
How much does an arborist consultation cost?
Many arborists offer free estimates for tree work. Formal written consultations or reports typically cost $150-$500 depending on complexity. Legal reports or expert witness services cost significantly more.
Is an arborist the same as a tree surgeon?
The terms are often used interchangeably. 'Arborist' is the professional standard term used by ISA. 'Tree surgeon' is an older, informal term. Look for ISA certification regardless of what the company calls themselves.