Arborist Reports in Puget Sound Region

Professional arborist reports for tree removal permits, hazard evaluations, construction impacts, insurance claims, and protected tree compliance throughout Seattle, Washington, and the Pacific Northwest. Our ISA Certified Arborists provide detailed documentation, tree risk assessments (TRAQ), and defensible recommendations for homeowners, contractors, HOAs, and municipalities across the Seattle region. Our ISA Certified Arborists provide detailed documentation, tree risk assessments (TRAQ), and defensible recommendations for homeowners, contractors, HOAs, and municipalities.

β˜‘ Tree risk assessments (TRAQ) β˜‘ Permit & code compliance reports β˜‘ Construction & root impact evaluations  β˜‘ Insurance & liability documentation

What Is an Arborist Report?

An arborist report is a formal written document prepared by a qualified arborist that evaluates the condition, health, structure, location, and surrounding site conditions of one or more trees. Arborist reports are commonly used for tree removal permits, development applications, construction planning, insurance claims, risk documentation, and municipal tree code compliance.

A professional arborist report typically includes tree species identification, trunk diameter measurements, canopy condition observations, photographs, site factors, and recommendations based on accepted arboricultural practices. Depending on the purpose of the report, it may also document structural defects, root impacts, soil conditions, construction conflicts, target areas, or preservation recommendations.

Cities and permitting departments often require arborist reports when property owners wish to remove protected trees, develop land near significant trees, or perform construction activities within regulated root protection areas. Arborist reports may also be requested by contractors, architects, HOAs, attorneys, insurance companies, and property owners seeking professional tree documentation.

Unlike a simple estimate or visual opinion, a certified arborist report is intended to provide organized, defensible documentation that can be reviewed by municipalities, project teams, or other third parties involved in a project or permit process.

Common uses for arborist reports include:

• Tree removal permit applications
• Development and construction planning
• Protected tree evaluations
• Tree preservation planning
• Insurance documentation and storm damage claims
• Neighbor tree disputes and property conflicts
• Root impact and excavation assessments
• Hazard tree documentation and condition assessments
• Municipal code compliance and permitting support

At Sound Tree Care, our arborist reports are prepared by ISA Certified Arborists with experience in tree risk assessment, municipal permitting processes, construction impacts, and tree preservation throughout the Seattle area.

When Are Arborist Reports Required?

Arborist reports are commonly required when trees may be affected by development, construction, grading, excavation, or proposed removal activities. Municipalities, contractors, insurance companies, and property owners often request professional arborist documentation before projects move forward.

Tree Removal Permits

Many cities require arborist reports before approving the removal of protected, significant, or exceptional trees.

Development Applications

Arborist documentation is often requested during land development, subdivision, and site planning review processes.

Construction Near Trees

Reports may be required when grading, trenching, excavation, or construction activities occur near retained trees.

Environmentally Critical Areas

Properties within steep slopes, shorelines, wetlands, or ECAs frequently require detailed arborist documentation.

Insurance & Storm Damage

Arborist reports help document tree failures, storm impacts, structural damage, and liability-related concerns.

Neighbor & Property Disputes

Professional tree documentation may be used to evaluate disputed tree conditions, impacts, or management recommendations.

What Is Included in an Arborist Report?

Arborist reports are designed to provide organized, defensible documentation regarding tree conditions, site factors, and management recommendations. While every project is different, most certified arborist reports contain several core components used by municipalities, contractors, insurance companies, and property owners.

β˜‘ Tree species identification
β˜‘ Diameter measurements (DSH/DBH)
β˜‘ Tree condition and vigor observations
β˜‘ Structural defect documentation
β˜‘ Pest, disease, and decay observations
β˜‘ Site conditions and soil factors
β˜‘ Construction and excavation impacts
β˜‘ Root disturbance evaluations
β˜‘ Tree inventory tables and measurements
β˜‘ Municipal code and permit references
β˜‘ Photo documentation and site imagery
β˜‘ Preservation, mitigation, or removal recommendations

Types of Arborist Reports

Arborist reports can serve many different purposes depending on the project, property conditions, and municipal requirements. Some reports focus on tree preservation and construction impacts, while others support permit applications, insurance documentation, or tree removal requests.

Tree Removal Reports

Prepared to document the condition of trees proposed for removal and support permit applications where municipalities require professional arborist documentation.

Construction Impact Reports

Used to evaluate how grading, excavation, trenching, and development activities may affect nearby trees, root systems, and preservation areas.

Tree Preservation Reports

Prepared to identify trees that should be retained and protected during development, site work, or major landscape changes.

Tree Inventory Reports

Used to document tree species, size, condition, and locations across residential, commercial, or development properties.

Insurance & Damage Reports

Prepared to document storm damage, fallen trees, structural impacts, or tree-related property concerns for insurance purposes.

Municipal Compliance Reports

Created to support permitting requirements involving protected trees, environmentally critical areas (ECAs), and local tree code compliance.

Arborist Reports for Tree Removal Permits

Many cities require an arborist report before approving the removal of protected, significant, or exceptional trees. These reports help municipalities evaluate whether a tree should be preserved, mitigated, pruned, or approved for removal based on its condition, location, and surrounding site factors.

An arborist report for tree removal permits may include:

• Tree species and size documentation
• Structural condition and defect observations
• Health and vigor assessments
• Site limitations and construction conflicts
• Photographs and supporting documentation
• Target evaluations and surrounding occupancy
• Root impacts, lean, decay, or failure indicators
• Preservation feasibility considerations
• Mitigation or replacement recommendations
• Municipal code references where applicable

Cities may use arborist reports to determine whether proposed removals meet local code requirements or whether alternatives to removal should be considered.

At Sound Tree Care, we regularly prepare arborist reports for tree removal permit applications involving protected trees, development sites, construction conflicts, steep slopes, environmentally critical areas (ECAs), and hazardous tree conditions throughout the Seattle area.

Example Arborist Report Components

Professional arborist reports are intended to provide organized documentation that can be reviewed by municipalities, contractors, property owners, insurance companies, and project teams. While every project is different, most arborist reports contain several core components that help explain the condition and management recommendations for the trees being evaluated.

Common arborist report components include:

• Tree inventory tables listing species, size, and condition
• Site maps or aerial imagery showing tree locations
• Photographs documenting defects, damage, or site conditions
• Tree health and structural observations
• Root zone and soil impact assessments
• Construction or grading conflict evaluations
• Municipal code references and permit considerations
• Tree preservation recommendations
• Pruning, mitigation, or removal recommendations
• Replacement tree or restoration recommendations where required

Depending on the scope of work, reports may also include canopy spread measurements, target assessments, risk observations, preservation fencing recommendations, excavation impacts, or monitoring recommendations for retained trees.

Professional arborist documentation helps create a clear record of tree conditions and project considerations before work begins or permit decisions are made.

Why Hire an ISA Certified Arborist for Reports?

ISA Certified Arborist Badge

Arborist reports are often used to support important decisions involving tree removal permits, development applications, insurance claims, construction planning, and municipal compliance. Because these reports may be reviewed by city planners, contractors, attorneys, insurance adjusters, HOAs, or neighboring property owners, the quality and credibility of the documentation matters.


An ISA certified arborist has demonstrated professional knowledge in tree biology, diagnosis, pruning standards, risk assessment, and tree preservation practices through examination and ongoing continuing education requirements established by the International Society of Arboriculture (ISA).


At Sound Tree Care, our arborist reports are built on real-world field experience, formal arboricultural training, and familiarity with local tree regulations throughout Seattle and the greater Puget Sound region. Our reports are designed to be clear, defensible, photo-documented, and aligned with ANSI A300 industry standards where applicable.


Hiring an ISA Certified Arborist for arborist reporting services can help ensure that:


• Tree species, size, and condition are documented accurately

 • Structural defects and site factors are properly evaluated

 • Recommendations are supported by accepted arboricultural practices

 • Reports contain the documentation municipalities commonly request

 • Tree preservation and construction impacts are evaluated professionally

 • Tree removal recommendations are supported with objective observations

 • Reports are easier for cities, contractors, and property owners to understand


Many municipalities and permitting departments specifically request documentation prepared by qualified arborists when reviewing protected tree removals, development applications, environmentally critical areas (ECAs), or construction near significant trees.


Whether you need an arborist report for a permit application, tree removal request, insurance documentation, or construction project, working with an ISA Certified Arborist helps provide professional documentation supported by industry standards and practical field experience.

Content Authorship & Certified Arborist Review

All content is reviewed by certified arborists with direct experience in arborist reports, local permitting, and urban canopy management. This page is written and reviewed by ISA Certified Arborists at Sound Tree Care LLC, a Seattle-based tree care company with hands-on field experience in tree removal, pruning, risk assessment, and municipal code compliance for Seattle tree care projects and properties across the Puget Sound region

Written By
AJ Flanagan, ISA Certified Arborist

AJ Flanigan

Assistant Operations Manager

ISA Certified Arborist (PN-374999A)

This page reflects real-world field experience performing tree risk assessments, arborist reports and hazard tree assessments under current arboricultuiral standards.

Reviewed By
Eric Ledford, ISA Certified Arborist and TRAQ Qualified Tree Risk Assessor

Eric Ledford

Founder, Sound Tree Care LLC

ISA Certified Arborist (PN-9290A) • TRAQ • NUCA Dig Safe

Eric reviewed this page for accuracy and alignment with ISA best practices, ANSI A300 standards, and ISA Tree Risk Assessors guidelines.

Schedule a Certified Arborist Report

Get clear, professional tree documentation from ISA Certified Arborists experienced in municipal permitting, development impacts, tree preservation, and arborist reporting throughout Seattle and the Puget Sound region.

 Common Arborist Report Services

βœ… Arborist reports for permits & development
βœ… Tree removal documentation & evaluations
βœ… Construction impact & root zone assessments
βœ… Tree preservation & protection planning

Why Property Owners Hire Sound Tree Care

πŸ“‹ ISA Certified Arborists & TRAQ-qualified evaluations
πŸ“Έ Photo-documented reports & site observations
πŸ› Municipal compliance support for local permitting
βš– Defensible documentation for property owners & contractors


πŸ“ Request an Arborist Report: Client Hub

πŸ“ž Speak to an Arborist 206-486-7790

πŸ“ Serving Seattle, Bellevue, Tacoma & the Puget Sound Region

  • ISA Certified Arborist Badge

    Slide title

    Write your caption here
    Button
  • Certified arborist performing tree inspection near residential property

    Slide title

    Write your caption here
    Button
  • TRAQ Qualified Tree Risk Assessment Arborist

    Slide title

    Write your caption here
    Button
  • ISA Certified Arborist conducting an arborist report

    Slide title

    Write your caption here
    Button
  • Tree protection zone diagram for arborist reports

    Slide title

    Write your caption here
    Button
  • Arborist tree protection plan for regulated trees

    Slide title

    Write your caption here
    Button