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You need an arborist report when someone with authority over your tree asks for one: a city, an HOA, an insurer, a lender, or the other side in a dispute. The person asking decides what the report must cover and who may sign it, so ask them first. An arborist is also not the same thing as a tree service. One writes opinions about trees, the other does the cutting.

What is an arborist report?

An arborist report is a written evaluation of specific trees by a person trained to judge them. It names each tree, records its condition, and gives a recommendation. Which recommendation depends on why the report exists.

The common kinds:

  • Removal justification. It explains why a tree is dead, diseased, or unsafe, so a city can decide on a removal permit.
  • Construction or development evaluation. It surveys the trees on a site and says which can be kept and how to protect them.
  • Tree risk assessment. It evaluates the risk a tree poses to people and property.
  • Appraisal. It puts a value on a tree, which matters when a tree is damaged or a city charges a fee for a removal.
  • Insurance or dispute reports. These answer whatever question the insurer or the other party has put in writing. Their format depends on who asked, so get the question in writing before you hire anyone.

Which San Diego County places ask for one?

It varies by city, and the rules change. Confirm the current version with the city before you spend money.

City of San Diego. For trees the City has designated as protected, Council Policy 900-19 says no removal permits are issued unless there is a clear, imminent, and significant public safety hazard. The exception is when the City Urban Forester, “informed by a certified arborist’s report and recommendations,” decides protection may not be the right course and the applicant agrees to pay the tree’s assessed value. The same policy says an owner may choose to have a private-property tree designated, and the City Urban Forester assesses an appraised value on designation. For a street tree, the City’s tree maintenance page says you “may request a No-Fee Permit for trimming, removal, planting or root pruning following inspection by City staff.” For the permit steps that apply to your tree, read our guide to tree removal permits in San Diego County.

Del Mar. The City’s applicant guide says a Tree Removal Permit is required before removing a Torrey pine or Monterey cypress anywhere in the city. It also covers any tree in the Central Commercial Zone, on public land, or in the Open Space Overlay Zone. If the tree is diseased, the application needs “a written statement prepared by a certified arborist stating the nature and extent of the disease.” The City may also require a report from its own arborist, and the applicant reimburses that cost.

Encinitas. The City’s Municipal Tree Ordinance, Chapter 15.02 says that “unless authorized by the City Arborist, no person shall remove any City tree or heritage tree.” Removing a heritage tree also requires a public hearing before the Planning Commission. If a construction project on private property involves “digging, excavating or trenching within the tree protection zone,” “a Tree Protection and Preservation Plan must be prepared by the property owner and approved by the City Arborist.” Ask the City Arborist what that plan must include and who may prepare it.

Poway. The City’s urban forestry page lists permits from Development Services before removing “certain species of trees on private property” and from Public Works for public property. Ask Development Services whether your species is on the list and whether a report is part of the application.

Solana Beach. Chapter 11.24 of the municipal code requires a written permit from the city manager to trim or remove a tree on public property or in the public right-of-way. That puts the first step with the city, not with a report.

Other cities and the unincorporated county have their own rules. If your city isn’t listed, call its planning or public works office and ask two things: is a report required, and who is allowed to sign it.

If an HOA is the one asking, see HOA tree disputes in San Diego. If the request comes from a neighbor, see neighbor tree and property line law.

What does a usable report contain?

The City of San Diego posts an example, a tree and palm evaluation report for a commercial redevelopment. It’s not a template for a backyard oak, but its layout shows what a reader should expect:

  • A scope: which trees were evaluated. That report covers each tree 2 inches in diameter or greater and all City street trees.
  • Measured observations per tree: trunk diameter, height, spread, health, and structural quality.
  • A tree map, so the reader can match each number to a tree.
  • Analysis and recommendations, including protection measures if trees stay.
  • Photographs, a glossary, and the author’s credentials.
  • A signed certification statement.

That certification includes a line worth looking for in any report: “my compensation is not contingent upon a reporting that favors the cause of the client.” The same report also says plainly that “a report, in itself, does not protect trees.” The recommendations only work if someone follows them.

Ask whether the author inspected the trees personally. That report states the author “made a personal inspection of the plants that are the subject of this report.”

Which credentials matter for writing a report?

Three credentials show up on report writers. They are not the same.

  • ISA Certified Arborist. The International Society of Arboriculture requires a minimum of three years of full-time experience in arboriculture or a mix of education and experience, then an exam. The certification is valid for three years and must be renewed. Encinitas defines a “certified arborist” in its tree chapter as one “certified by the International Society of Arboriculture.”
  • ISA Tree Risk Assessment Qualification (TRAQ). ISA describes TRAQ as “an instructor-led training and assessment program” in tree risk assessment. ISA says “the ISA TRAQ credential is valid for seven years,” and holders must retrain and retest to renew it. Ask for it when the question is whether a tree might fall.
  • ASCA consulting arborist. ASCA is the American Society of Consulting Arborists, a professional society. The San Diego sample report above is signed by a Registered Consulting Arborist who also lists an ASCA tree and plant appraisal qualification. Ask ASCA directly about its current requirements and how to verify a member.

Be clear about what none of these is. The ISA says its certifications “do not represent licensure, registration, or other authorization to practice or to conduct business activities for a fee or otherwise.” Tree work is licensed separately: CSLB handles tree service contractors under its C-49 Tree and Palm classification.

How do I check a credential?

Check the person and the company separately. Search the ISA Credential Directory for the report writer, and use the CSLB license check for any company that will do the work. A name missing from the ISA directory isn’t proof on its own, because people can choose to be excluded.

Is an arborist different from a tree service?

Yes, on two points. The first is the job. An arborist evaluates trees and writes opinions, such as a diagnosis, a risk rating, a protection plan, or an appraisal. A tree service is a contractor that prunes, removes, and grinds. The second is the paperwork. An ISA credential belongs to a person. A CSLB license belongs to a contractor and covers the work.

The two can overlap. The ISA says it “promotes the hiring of companies who have ISA certified professionals on staff.” Some companies have an arborist on staff, and some arborists only consult.

That raises a conflict question when the same company diagnoses the tree and bids to remove it. Ask the agency or insurer whether it accepts a report from the company that would do the work. If it doesn’t, hire an independent consulting arborist and keep the contractor’s bid separate. The sample report’s certification line, that pay is not tied to a result that favors the client, is a good standard to ask any report writer to meet.

Frequently asked questions

Do I need an arborist report to remove a tree on my own property in San Diego?

It depends on the city, the species, and whether the tree is protected or designated. Del Mar, for example, requires a permit for Torrey pines and Monterey cypresses citywide. Ask your city before you hire anyone.

Is an ISA Certified Arborist the same as a licensed tree contractor?

No. The ISA states its certifications are not a license to practice or do business. Contractors who do tree work are licensed by CSLB. Check both.

Who pays for an arborist report?

Del Mar’s guide says that when the City hires its own arborist for a review, the applicant reimburses the City. For an HOA or neighbor dispute, who pays depends on your governing documents or a lawyer’s advice.

Will a report guarantee my permit or claim goes through?

No. A report is evidence, and the agency, insurer, or HOA decides. Ask them what they accept before you commission one.

Can the company that removes my tree also write the report?

Ask the agency or insurer whether it accepts a report from the company doing the work. If the decision will be contested, an independent consulting arborist avoids the question.

What if the city asks for a report and I’m not sure who qualifies?

Ask the city for its wording. Del Mar says “certified arborist,” and Encinitas defines that term by ISA certification. Match the credential to the words on the application.

The short version

Get a report when an authority asks for one, and ask what it must cover and who may sign it. Check the writer’s ISA credential for the report and the contractor’s CSLB license for the work. Keep the two roles separate when the decision may be contested.

When to call a tree professional

Call when a city, HOA, or insurer has asked for a tree evaluation, or when you aren’t sure whether a tree is safe. See arborist consultation for what the visit covers. If removal follows, tree removal is the next step. Call (858) 400-4587 and Limb SD will connect you with a licensed local tree professional.