CanopyMetrics
Litigation Support & Expert Witness

Independent arboricultural expertise
for North Bay attorneys.

CanopyMetrics provides expert witness retention, written opinions, and testimony in arboricultural disputes — tree failure, construction damage, boundary conflicts, and property damage claims. No tree work. No agenda. No conflict of interest.

Discuss a matter → Conflict check performed at no charge on initial contact.

CanopyMetrics does not sell tree services. We have no financial interest in any outcome — which is precisely why our testimony is credible under cross-examination.

Scope of Services

CanopyMetrics provides the full range of arboricultural litigation support — from early-stage evaluation through trial testimony. Engagements are taken for both plaintiff and defense.

Pre-Litigation Site Inspections & Preliminary Opinion Letters

Early assessment of the arboricultural facts before formal retention. Identifies whether the evidence supports the theory of the case, with a documented site visit and a written preliminary opinion. Used to evaluate case viability and inform settlement decisions before discovery costs mount.

Arborist Reports for Property Damage Claims

Comprehensive written reports addressing tree failure, root damage, encroachment, and related property damage claims. Covers causation analysis, ISA TRAQ-based risk evaluation, tree value appraisal under accepted methodology (Trunk Formula Method, Composite Method), and supporting photographic documentation. Written to withstand opposing expert review and cross-examination.

Expert Declarations & Rule 26 / CCP 2034 Disclosures

Written expert designations prepared to comply with Federal Rule of Civil Procedure 26 requirements and California Code of Civil Procedure §2034 simultaneous-exchange requirements. Includes all mandated elements: opinions, bases and reasons, facts relied upon, qualifications, prior testimony, and compensation disclosure. CV available on request.

Deposition & Trial Testimony

Available for deposition and trial testimony in California Superior Court and federal matters. Testimony is grounded in published ISA standards and ANSI A300 — not subjective professional impression. Prior experience with deposition and expert examination available for attorney review. The goal is opinions that survive Daubert/Kelly-Frye scrutiny.

Rebuttal Reports & Review of Opposing Expert Opinions

Critical review of opposing arborist reports — identifying methodological deficiencies, unsupported conclusions, credential gaps, and departures from ISA TRAQ methodology or ANSI A300 standards. Rebuttal reports are structured to address each opinion the opposing expert has offered, with specific reference to conflicting evidence or published standards.

Boundary Tree, View Ordinance & Neighbor Dispute Analysis

Analysis of boundary tree matters under California Civil Code §§ 833–834, treble-damage exposure under §3346, and related ordinance compliance. Includes trunk location determination, encroachment documentation, canopy documentation for view ordinance proceedings, and analysis of prior maintenance history. For HOA disputes, CC&R interpretation context provided where applicable.

Matter types handled
Tree failure / personal injury Root damage to structures Encroachment & encroachment damages Construction damage to protected trees Boundary tree disputes Negligent pruning or removal View obstruction Insurance subrogation Ordinance violation enforcement HOA / CC&R disputes
CanopyMetrics

Evaluating a tree dispute or damage claim? Initial conflict check and scope discussion at no charge.

Start an inquiry →

Engagement Process

Most litigation support engagements follow a four-step sequence. Timeline compresses when required by discovery deadlines — state your timeline in the initial contact.

01

Conflict check & scope call

Initial contact. We run a conflict check against parties and counsel, confirm there is no prior relationship that would disqualify CanopyMetrics from the engagement, and discuss the matter, timeline, and expected deliverables. This step is no-charge and does not create a retainer relationship. You describe what happened; we confirm whether the arboricultural facts support an engagement and what form the engagement should take.

02

Retainer & document review

Engagement agreement executed and retainer paid. We review all available documents: prior inspection records, photographs, maintenance history, permit files, survey data, municipal tree ordinance history, correspondence between parties, and any existing arborist reports. Document review often shapes the site inspection protocol — what to look for, what evidence may have been preserved or destroyed, where the methodological weaknesses in existing reports lie.

03

Site inspection & report

Documented site visit following ISA TRAQ methodology. All observations, measurements, and photographic documentation recorded contemporaneously. Written report produced on completion: engagement background, site description, methodology, findings, analysis, opinion, limitations, and — where applicable — tree value calculation. Reports are signed by a TRAQ-qualified ISA Certified Arborist. Standard turnaround is 7–10 business days from site visit; rush available at stated surcharge.

04

Testimony, if needed

Expert designation submitted per applicable procedural rules (FRCP 26 or CCP 2034). Deposition preparation with retaining counsel. Deposition testimony. If the matter proceeds to trial: trial prep, direct examination, and cross-examination. We have been cross-examined — and understand what opposing counsel looks for in an arborist expert. Hourly billing applies to all testimony-related time, including preparation.

Credentials

The credentials below are the ones courts and opposing counsel will ask about. We state them accurately — no overclaiming, no omissions.

Held

ISA Certified Arborist — Utility Specialist

A specialty-level certification from the International Society of Arboriculture, representing advanced knowledge in arboriculture beyond the base ISA Certified Arborist credential. The Utility Specialist designation is issued following separate examination and demonstrates competency in the specific arboricultural contexts relevant to infrastructure, high-voltage environments, and complex structural assessments. ISA certification is verifiable at treesaregood.org.

Held

ISA Tree Risk Assessment Qualification (TRAQ)

The ISA TRAQ qualification is required to perform and sign structured tree risk assessments under ISA methodology. It is the recognized standard for expert arborist risk assessments in North Bay jurisdictions and California courts. All risk assessments and litigation-support reports are conducted and signed under TRAQ methodology.

In Progress

ASCA Registered Consulting Arborist (RCA)

The American Society of Consulting Arborists Registered Consulting Arborist designation requires documented consulting experience, a written examination, and peer review. Candidacy is currently in progress. This credential has not yet been conferred and is not claimed in any report or expert disclosure.

A curriculum vitae including education, credentials, and prior expert testimony history is available on request. It will be produced in response to any expert disclosure requirement.

Methodology

Every report produced for litigation or expert witness purposes is grounded in published, peer-reviewed standards — not proprietary methodology or subjective professional opinion. This is what survives cross-examination.

ISA TRAQ

ISA Tree Risk Assessment Qualification Methodology

The TRAQ two-step process assigns likelihood-of-failure and likelihood-of-impact ratings to each identified failure part and target. Risk ratings (Low / Moderate / High / Extreme) are determined by the published TRAQ matrix — not subjective judgment. All risk assessments and failure analysis reports follow TRAQ Level 2 (Detailed Visual Assessment) as the baseline, with Level 3 diagnostic tools (resistograph, sonic tomography) added where findings warrant.

ANSI A300

American National Standards Institute A300 Tree Care Standards

ANSI A300 is the authoritative national standard for tree care operations. All work recommendations, pruning assessments, and construction-impact evaluations are benchmarked against A300 performance standards. Departures from A300 by a property owner, contractor, or tree service — whether in pruning specification, root protection, or structural support — are documented and cited by standard section in reports.

ISA BMPs

ISA Best Management Practices

The ISA BMP series operationalizes ANSI A300 for practitioners. Reports reference the relevant BMP guides — Tree Risk Assessment, Pruning, Utility Pruning — where the opposing party's actions deviate from published best practices. This framing is more useful to courts than a bare assertion that something was "done wrong."

Tree Valuation

Council of Tree & Landscape Appraisers (CTLA) / Guide for Plant Appraisal

Tree damage value calculations use the Trunk Formula Method or the Composite Method as described in the CTLA Guide for Plant Appraisal, 9th Edition. Method selection is determined by tree size and appraisal context. All assumptions, species classifications, and appraisal factors are documented in the report appendix.

Why methodology framing matters in litigation: An expert opinion that says "the tree was hazardous" is vulnerable. An opinion that says "the tree exhibited a Probability of Failure rating of High under ISA TRAQ Level 2 assessment, based on documented basal decay with fungal conks present, and a Likelihood of Impact rating of High given target proximity — resulting in an Overall Risk Rating of Extreme under the ISA risk matrix — is defensible." The difference is cite-able standards versus unsupported assertion.

Geographic & Court Coverage

Primary — California Superior Court

  • Marin County Superior Court — San Rafael
  • Sonoma County Superior Court — Santa Rosa
  • Napa County Superior Court — Napa

Primary field service area and primary jurisdictions for testimony. Familiar with North Bay judicial culture, local ordinance landscape, and the specific tree species, soil conditions, and site characteristics that arise in North Bay matters.

Available — Federal & Other State Courts

  • U.S. District Court, N.D. Cal. — San Francisco / Oakland / San Jose
  • Other California Superior Courts on request
  • Out-of-state matters evaluated case by case

Available for federal matters in the Northern District of California and for California Superior Court matters outside the primary service area when the engagement warrants travel. Contact us to discuss jurisdiction and timeline.

CanopyMetrics maintains current working knowledge of tree ordinances for all 10 North Bay jurisdictions: Marin County, Sonoma County, Napa County, Santa Rosa, Petaluma, San Rafael, Novato, Sonoma, St. Helena, and Healdsburg. See the North Bay Tree Ordinance Reference for compiled details.

Start an Inquiry

Initial conflict check and scope discussion at no charge. Describe the matter below — jurisdiction, parties involved (without privileged detail), and timeline — and we'll respond within one business day.

Litigation Support Inquiry

Tell us about the matter

We respond within one business day. Conflict check performed on receipt.