Arborist Reports & Tree Risk Assessments in Issaquah, WA

MTS Tree & Landscape provides arborist reports and tree risk assessments in Issaquah for tree permits, hazardous-tree concerns, home purchases, HOA requests, insurance documentation, and construction planning.

Our arborist consultations in Issaquah include written reports, tree risk assessments, pre-purchase inspections, tree inventories, and pre-construction evaluations. For broader condition concerns, MTS also provides professional tree health assessments.

Call (425) 369-8733 or request a quote for your arborist report.

What Kind of Arborist Report Do You Need?

Most Issaquah property owners need one of four deliverables: a permit-support arborist report, a tree risk assessment, a written condition report, or a tree survey and protection plan.

Use the purpose of the assessment to choose the report:

An arborist report is the written document. A tree risk assessment is a specific evaluation of failure risk that may be included within that report.

If the City, HOA, buyer, insurer, or project team requested documentation, send MTS their written requirements before the inspection. That allows the arborist to scope the correct deliverable from the start.

What Does Issaquah Require for a Tree Permit?

Issaquah requires a Tree Permit in most cases for tree removal, excessive pruning as defined by City code, and creation of a wildlife snag. Some applications also require supporting documentation from a qualified professional arborist.

According to the City of Issaquah Tree Permit requirements, a “significant tree” is generally a tree at least six inches in diameter at breast height, or at least eight inches for alder and cottonwood.

The City's Tree Permit Submittal Requirements show that professional documentation may include:

• Written arborist recommendations
• An abbreviated tree plan
• A hazard mitigation evaluation
• TRAQ forms
• Tree species, size, and health information
• Photographs and supporting evidence
• The applicable tree-removal approval criteria

The permit package also requires a site plan showing trees proposed for removal and replacement locations.

Not every permit needs the same arborist document. The report should be built around the specific City requirement for the tree and proposed work.

What About Hazardous Trees?

A hazardous-tree application needs professional evidence of the defect and risk, not simply a statement that the tree looks dangerous.

Depending on the permit path, Issaquah may require TRAQ documentation or an arborist report prepared by the appropriate qualified professional.

The assessment documents:

• The defect or condition present
• The part of the tree that could fail
• What it could strike
• Likelihood of failure
• Potential consequences
• Available mitigation options

A lean, cavity, fungal fruiting body, crack, or dead branch alone does not establish the final risk rating.

Arborist Report vs. Tree Risk Assessment vs. Tree Survey

An arborist report is the written document, a tree risk assessment evaluates failure risk, and a tree survey inventories multiple trees. A tree protection plan is used to protect retained trees during construction.

Arborist Report

An arborist report may document:

• Tree identification
• Size
• Condition
• Structural defects
• Site conditions
• Photographs
• Risk findings where applicable
• Recommendations
• Permit criteria
• Retention or removal recommendations

A formal risk assessment can be included in the report, but not every arborist report is a risk assessment.

Tree Risk Assessment

A tree risk assessment asks four practical questions:

1. What part of the tree could fail?
2. How likely is that failure?
3. What could the tree or branch hit?
4. What would the consequences be?

The International Society of Arboriculture's credential guidance explains the Tree Risk Assessment Qualification used for structured risk work.

Tree Survey or Inventory

A tree survey normally covers multiple trees and records information such as:

• Tree number
• Species
• DBH
• Location
• Condition
• Structure
• Retention or removal recommendation
• Construction implications

Tree Protection Plan

A tree protection plan focuses on trees that will remain during construction and may address:

• Tree protection zones
• Fencing
• Root impacts
• Grading
• Equipment access
• Soil disturbance
• Arborist monitoring

For development work, send MTS the project plans and City requirements before the site visit so the correct scope can be established.

What Happens During a Tree Risk Assessment?

A tree risk assessment examines the tree, the site, potential failure points, and what could be damaged or injured if failure occurs. Most detailed residential assessments use a ground-level Level 2 inspection, while Level 1 screening and Level 3 advanced assessment serve different purposes.

The arborist may evaluate:

• Species and size
• Crown condition
• Dead or broken branches
• Trunk structure
• Branch attachments
• Visible cavities or decay
• Root flare and visible roots
• Previous failures
• Soil and site conditions
• Recent changes around the tree
• Nearby buildings, roads, walkways, or other targets
• Potential failure parts
• Likelihood and consequences of failure

Risk is not determined by the tree alone.

A defective branch over an unused corner of a property presents a different risk from the same branch above a home's primary entrance.

Level 1: Limited Visual Assessment

Level 1 is a broad visual screening used to identify obvious concerns and trees that need closer inspection.

It is useful when reviewing multiple trees quickly but is not designed to answer every detailed structural question.

Level 2: Basic Assessment

Level 2 is a detailed ground-level assessment of an individual tree, its visible defects, nearby targets, and the likelihood and consequences of failure.

This level supports many residential risk decisions.

Level 3: Advanced Assessment

Level 3 adds specialized investigation when a Level 2 inspection cannot provide enough information to answer the risk question.

It may involve additional measurements or diagnostic tools. It is not automatically necessary for every tree with a visible defect.

For broader tree-condition concerns that do not require formal risk documentation, see MTS's professional arborist tree health assessment service.

What Should a Written Arborist Report Include?

A professional arborist report should identify the tree, document its condition and relevant site factors, explain the arborist's findings, and provide clear recommendations. Permit and risk reports should also include the information required for that specific decision.

Depending on the assignment, the report may contain:

• Property or client information
• Tree number or location
• Species
• DBH or other measurements
• Crown condition
• Trunk and branch observations
• Visible root or site conditions
• Structural defects
• Photographs
• Target information
• Risk rating where a formal risk assessment applies
• Recommendations
• Mitigation options
• Relevant permit criteria
• Arborist credentials
• Report date and signature

For an Issaquah permit, the report should respond directly to the City's stated submittal requirements.

A generic health letter is not a substitute for a hazard assessment when the City is asking for documented risk information.

How Much Does an Arborist Report Cost in Issaquah?

MTS currently publishes regional pricing of $200-$400 for a single-tree written report and $250-$500 for a single-tree TRAQ risk assessment. Multi-tree and pre-construction reports typically start higher because they require more inspection, documentation, and analysis.

These are current MTS regional service ranges, not independent Issaquah market averages.

See MTS's current arborist consultation and reporting services for the latest published ranges.

What Changes the Price?

The main price drivers are:

• Number of trees
• Written report vs. verbal consultation
• Formal risk-assessment requirements
• Tree inventory or mapping
• Property size
• Site access
• Permit research
• Construction-plan review
• Advanced diagnostics
• Amount of photography and supporting documentation

A single-tree permit report is a much smaller assignment than documenting 25 trees around a proposed construction site.

Request a written report quote with the number of trees and the reason for the assessment.

From Site Visit to Written Report: How the Process Works

The arborist-report process has six steps: confirm why the report is needed, review any outside requirements, inspect the tree or site, document the findings, prepare the report, and deliver it for the intended permit, transaction, or management decision.

1. Tell Us Why You Need the Report

Common reasons include:

• Issaquah tree permit
• Hazardous-tree concern
• HOA request
• Home purchase
• Insurance documentation
• Construction planning
• General tree-condition concern

2. Send Any Existing Requirements

If the City, HOA, insurer, buyer, lender, engineer, or another party requested the report, send their written requirements before the inspection.

For City permits, use the Issaquah permit guidance linked earlier on this page to confirm what the application requires.

3. The Arborist Inspects the Tree or Property

A single-tree risk assessment focuses on the tree, site, potential failure parts, and targets.

Construction work may require an inventory across the entire property.

4. The Findings Are Documented

The agreed scope may include:

• Measurements
• Photographs
• Site observations
• Condition notes
• Risk findings
• Mapping
• Permit criteria
• Recommendations

5. The Written Report Is Prepared

The report is built around the agreed purpose rather than a generic template.

6. You Receive the Documentation

The report can then support:

• City permit submission
• HOA review
• Construction planning
• Property purchase
• Insurance review
• Tree-management decisions

The arborist provides the professional findings. The City, HOA, insurer, buyer, or lender makes its own final decision.

Arborist Reports for Home Purchases, HOAs, and Construction

Outside of tree permits, the three most common reasons to request written arborist documentation are evaluating mature trees before buying a property, satisfying an HOA request, and documenting trees affected by construction.

Buying a Property With Mature Trees

A pre-purchase assessment can flag visible tree conditions and potentially significant management needs before closing.

It is especially useful when the property has:

• Large trees near the home
• Wooded acreage
• Steep slopes
• Visibly declining trees
• Multiple mature trees
• Trees likely to require substantial future work

A visual arborist assessment cannot identify every hidden defect, but it can give a buyer much more information than an ordinary home inspection typically provides about the trees.

HOA Documentation

An HOA report should answer the questions the board or architectural committee actually asked.

That may mean documenting:

• Tree condition
• Species and size
• Visible defects
• Risk
• Recommended pruning
• Removal recommendation
• Photographs

Send the HOA's written requirement before booking so the report can be scoped correctly.

Construction and Development

Construction-related arborist work can include:

• Tree inventory
• Species and DBH documentation
• Condition assessment
• Retention or removal recommendations
• Tree protection zones
• Construction-impact review
• Tree protection planning
• Arborist monitoring

Issaquah's permit process can require professional tree documentation for development work.

The best time to assess retained trees is before grading, foundations, utilities, access routes, and other site decisions are finalized.

Is the Tree Hazardous, or Is It an Emergency?

A hazardous tree has a documented risk of failure and harm that requires professional evaluation or mitigation. An emergency is an immediate threat, such as a tree already on a structure or road, a major active failure, or contact with electrical infrastructure.

Conditions that justify prompt professional assessment include:

• A new or changing lean
• Root-plate movement
• A major trunk crack
• Large broken branches
• Significant decay
• Previous partial failure
• Major storm damage
• A defective tree or branch over an important target

Those conditions are reasons to assess the tree, not automatic proof that it must be removed.

What If the Situation Is Immediate?

Do not wait for a written arborist report if:

• A tree has fallen onto a road
• A tree is resting on a structure
• A major section is actively failing
• Electrical lines are involved
• People are in immediate danger

Keep people out of the area and address the immediate safety issue first.

For physical storm response, see MTS's Issaquah emergency tree service.

If assessment shows that removal is appropriate, MTS also provides Issaquah tree removal services.

Who Should Prepare an Arborist Report?

For Issaquah permit and tree-condition work, start with a qualified professional arborist who holds the credentials required for the assignment. Formal tree-risk work may require an ISA Tree Risk Assessment Qualified arborist, while an ordinary written condition report may not.

ISA Certified Arborist

An ISA Certified Arborist has demonstrated professional knowledge across core areas of arboriculture.

You can verify an ISA arborist credential through ISA's public directory.

ISA Tree Risk Assessment Qualified

TRAQ is a separate ISA qualification focused specifically on structured tree-risk assessment.

It is especially relevant when the assignment requires formal tree-risk analysis.

Qualified Professional Arborist

Issaquah uses the term Qualified Professional Arborist for certain professional tree documentation.

Someone who performs tree work is not automatically qualified to prepare the report required for a municipal permit.

Consulting Arborist

A consulting arborist may be appropriate for more specialized assignments such as:

• Complex disputes
• Tree valuation
• Litigation
• Expert testimony
• Large development projects

This level of consulting is not automatically necessary for an ordinary residential tree permit.

Arborist Report & Tree Risk Assessment FAQ

Does every Issaquah tree permit require an arborist report?

No. Issaquah requires a Tree Permit in most tree-removal situations, but the supporting documentation varies. Some applications require professional arborist documentation, hazard information, an abbreviated tree plan, or TRAQ forms. Check the City's current requirements before commissioning a report.

Can one arborist report cover several trees?

Yes. A full-property or project report can cover multiple trees when the scope includes each tree's identification, condition, and recommendations. MTS currently publishes $500-$1,000+ for full-property written reports, with larger construction assignments priced separately.

Will Issaquah automatically approve a permit if I submit an arborist report?

No. An arborist report provides professional evidence for the application. The City determines whether the documentation is complete and whether the proposed work satisfies the applicable approval criteria.

Can I use the same report for an HOA or home purchase?

Only when the report answers what that recipient needs. An HOA may want a removal recommendation, while a buyer may need condition and future-management information. Send the recipient's requirements before the inspection so the report can be written for the intended use.

How quickly can I get an arborist report?

MTS does not publish a universal turnaround time. The timeline is set by the number of trees, report type, site complexity, and current scheduling. Provide any permit, closing, HOA, or construction deadline when booking.

Need an Arborist Report in Issaquah?

Tell MTS why the report is needed, how many trees are involved, and whether you already have requirements from the City, an HOA, buyer, insurer, or project team. That is enough to start scoping the correct assessment.

MTS Tree & Landscape provides arborist consultations, written reports, tree risk assessments, property evaluations, and pre-construction tree consulting in Issaquah.

Call (425) 369-8733 , email info@nwmts.com , or request a quote for your assessment.