Subrogation-ready arborist documentation
for North Bay property claims professionals.

Standard written report delivery is 7–10 business days from site visit. Insurer demand letters in property subrogation commonly run on a 30-day calendar from loss event — the standard SLA is structured to leave margin in that cycle for internal review, subrogation counsel vetting, and demand-letter preparation. Site inspection scheduling is within 5 business days of engagement.

A rush tier (3–5 business days from site visit) is available at a stated surcharge when the cycle is tighter; the 48–72-hour post-storm emergency response tier applies to multi-tree loss events and wildfire-adjacent claim openings. State any particular deadline at the intake call so SLA is calibrated against the file at engagement.

Yes. Multi-tree and storm-event losses are handled under either a single-engagement structure (one master engagement covering several claims that share a common loss event) or a multi-claim structure (separate engagements per claim reference but coordinated documentation protocols). The 48–72-hour post-storm emergency response SLA applies to high-volume events.

We staff event-level losses with simultaneous site visits where geography allows — multiple arborists on the same loss date preserves the photographic chain-of-custody and the contemporaneous field-notes timeline that subrogation counsel will rely on later. The intake call captures claim count, geographic spread, and any cross-carrier coordination before SLA is committed.

Site inspection is typically a flat fee per visit, scoped to the number of trees and the documentation required. The written subrogation-ready report is a flat fee per report, structured to engagement complexity (single-tree vs multi-tree, claims-only vs deposition-readable). Post-storm emergency event response carries a separate event-rate structure.

Pre-engagement consultation and post-report consultation with the claims team are included in standard engagements. Deposition and trial testimony, where the matter escalates, are billed hourly — see Litigation Support for those terms. The intake call confirms scope and provides a fee estimate before any site work begins; we do not bill for the conflict check or the no-charge initial review.

A subrogation-ready report contains five non-negotiable elements:

• Specific defect identification with documented failure mechanism — not a generic "the tree was hazardous" but a specific defect (basal decay with fungal conks, included bark at a co-dominant stem, root plate severance, etc.) with the failure mode linked to it.
• Foreseeability analysis grounded in California Civil Code §§ 833–834 and Booska v. Patel (1993) 76 Cal.App.4th 1, with the specific factual basis for foreseeability on the facts of the file.
• Methodology reference to ISA TRAQ Level 2 and ANSI A300 standards, so conclusions are traceable to published standards rather than subjective professional impression.
• Damages quantification with itemized repair or replacement costs (CTLA Trunk Formula Method or Composite Method where tree value is at issue).
• Qualifications disclosure including ISA cert number (#WE-12351AU), TRAQ qualification, and prior testimony history.

Opinions are numbered throughout so the report satisfies FRCP Rule 26 and CCP 2034.220 from the first draft without rework if the matter escalates. See the full subrogation field guide for the report anatomy; see also the annotated TRAQ walkthrough for sample report lines.

Yes. Critical review of opposing arborist reports is a standard service — common in subrogation defense where the insurer's selected arborist has filed a report favorable to the property owner.

• Methodological deficiencies — departures from ISA TRAQ or ANSI A300 protocol, undocumented assumptions.
• Unsupported conclusions — opinions not traceable to observed evidence.
• Credential gaps — expired certifications, unverified claims, undisclosed limitations.
• Conflicts between the opposing expert's opinion and the physical evidence on record.

Rebuttal reports are structured to address each opinion the opposing expert has offered, with specific reference to published standards and the specific evidence in the record. They are also formatted for Rule 26 / CCP 2034 disclosure in case the matter is filed.

Yes. The same TRAQ-qualified principal who authored the report carries the deposition. The engagement transitions to Litigation Support for testimony-related services (deposition, trial, Rule 26 / CCP 2034 designation, expert disclosure).

Critically, the report written for the claims phase is the same report used at deposition — there is no second report produced for trial, no second site visit, and no re-credentialing. This continuity matters because the most common evidentiary problem in subrogation matters that escalate is that the report-for-claims does not match the report-for-disclosure. We write the report once, to the disclosure standard, and it is used twice.

Primary field service area and primary geographic coverage: Marin County, Sonoma County, and Napa County. Familiar with the North Bay judicial culture, the local ordinance landscape across all 10 jurisdictions, and the specific tree species, soil conditions, and microclimate factors that arise in North Bay claims.

Post-storm and wildfire-adjacent emergency response is available at the 48–72-hour event SLA across the full coverage area. Out-of-area evaluation (other California counties, out-of-state matters) is available case by case — contact us to discuss jurisdiction and travel.

Local North Bay tree ordinances factor into subrogation causation as a documented departure from the applicable standard of care — not as the proximate cause itself, but as evidence that the responsible party operated below the locally-defined duty. Permit requirements for removal, Tree Protection Zone (TPZ) requirements during construction activity, protected-species designations (Sonoma County's April 2024 protected-species ordinance is a current example), and replacement / mitigation requirements all generate documentary records.

Where construction activity, pruning, or removal proceeded without a required permit, or where a TPZ was violated during grading or trenching, the ordinance violation is documented by section and cited in the report. This is relevant both to a direct negligence theory and to California Civil Code § 3346 treble-damages exposure in boundary tree matters. See the North Bay Tree Ordinance Reference for compiled details.

Commonly documented North Bay–specific failure modes:

• Clay-soil shrink-swell on Marin and Sonoma hillside parcels — root plate disturbance and heave during seasonal moisture cycling.
• Post-fire tree stress following the 2017 Tubbs, 2019 Kincade, and 2020 Glass fire events — root system damage and crown dieback that did not present as failure until 3–7 years post-fire.
• Sudden Oak Death (SOD, Phytophthora ramorum) — particularly in western Sonoma County and along the Marin–Sonoma coast — causing structural compromise in affected oak and tanoak populations.
• Microclimate wind exposure around San Pablo Bay, the Petaluma Gap, and the Sonoma Valley corridor — sustained winds that exceed the design assumptions in standard tree-risk protocols.

Each failure mode has specific observable indicators documented in the report, and each factors into the foreseeability analysis under Civil Code §§ 833–834. An out-of-area arborist will not document these because they do not arise in their local case base.

Independence matters directly because the report will be attacked. The single most common impeachment line against an arborist expert on cross-examination is financial conflict: the expert also sells tree removal or maintenance services, so the recommendation to remove generates revenue for them. This is particularly damaging in subrogation files because subrogation counsel is asking the trier of fact to impose liability — and a witness with a financial interest in the outcome is a witness whose credibility can be impeached.

CanopyMetrics does not perform tree work — no pruning, removal, cabling, fertilizing, or any other arboricultural service work. We have no financial relationship with any tree service company. When our report recommends removal, it is because the TRAQ risk evidence supports it — not because we profit from it.

In a subrogation file that escalates to deposition, this is the difference between a report that survives cross-examination and one that does not. It is why independence is stated plainly on every page of this site and on every engagement confirmation. See the Litigation Support independence section for the broader framing on expert witness admissibility.