FAQ

What is the difference between an arborist and a certified arborist?

The term “arborist” is not regulated and can be used broadly. A Certified Arborist is a professional who has met the requirements of the International Society of Arboriculture (ISA), including education, experience, and examination, and who maintains certification through continuing education.

Our staff includes ISA Certified Arborists, as well as Board Certified Master Arborists and Registered Consulting Arborists through the American Society of Consulting Arborists.

Do I need an arborist report?

In many cases, a written report is not required. An arborist consultation and site visit can provide guidance on tree condition, risk, and management options. If documentation is later needed for permitting, planning, or legal purposes, an arborist report can be prepared following the visit.

What is included in a consultation and site visit?

A consultation includes an on-site evaluation of tree condition, structure, and site factors, along with discussion of observations and recommendations. In many cases, this is sufficient to answer questions and guide decision-making without the need for a written report.

When is a tree risk assessment needed?

A tree risk assessment is typically appropriate when there are concerns about defects, decay, lean, or potential failure, particularly where trees could impact structures, people, or infrastructure.

How do I get a permit to remove a tree?

Many jurisdictions require an arborist report as part of the tree removal permit process. A site visit can help determine whether a report is needed and what information will be required. If necessary, a report can be prepared to support the application.

What is a tree protection plan?

A tree protection plan outlines measures to reduce impacts to trees during construction. This may include protective fencing, limitations on grading or excavation, and recommendations for construction practices within the root zone.

Do you provide services for construction projects?

Yes. We work with property owners, architects, contractors, and public agencies to evaluate trees in relation to proposed development and to prepare arborist reports, tree protection plans, and vegetation management plans.

Do you provide expert witness services?

Yes. We provide consulting and expert witness services in matters involving tree condition, failure, and management, including document review, site inspection, and testimony when required.

Where do you work?

We provide consulting arborist services throughout Marin County, Sonoma County, Napa County, and surrounding Bay Area communities. Expert witness services are also provided more broadly.