Arborist Reports Explained

What Is an Arborist Report?

An arborist report is a professional document prepared by a qualified arborist that provides a detailed assessment of one or more trees. It is the primary document used by councils, developers, and property owners to make informed decisions about tree management.

Reports are commonly required for council tree removal permits, development applications, insurance claims, neighbour disputes, and pre-purchase property assessments.

Types of Arborist Reports (Levels 1–5)

Level 1 — Visual Tree Assessment (VTA)

A ground-level visual inspection of the tree. The arborist assesses overall health, structural condition, and any obvious defects. This is the most common type and is sufficient for most council permit applications.

Typical cost: $300–$500 per tree

Level 2 — Detailed Assessment

Includes a Level 1 assessment plus additional investigation using diagnostic tools such as a resistograph (decay detection drill), sonic tomography, or aerial inspection. Used when a more thorough understanding of internal condition is needed.

Typical cost: $500–$1,000 per tree

Level 3 — Advanced Assessment

A comprehensive investigation that may include root excavation, soil analysis, and load testing. Reserved for high-value or high-risk trees where detailed structural analysis is critical.

Typical cost: $1,000–$2,500+ per tree

Level 4 — Multi-Tree / Site Assessment

An assessment of multiple trees across a development site. Commonly required for subdivision applications, construction projects, and environmental impact assessments. Includes tree protection zones (TPZ) and structural root zone (SRZ) calculations.

Typical cost: $1,500–$5,000+ depending on scope

Level 5 — Tree Management Plan

A strategic long-term management plan for trees on a property or within a precinct. Covers maintenance schedules, risk management, replacement planting, and compliance monitoring. Typically commissioned by councils, body corporates, or large landholders.

Typical cost: $3,000–$10,000+

When Do You Need an Arborist Report?

Council tree removal permit — Most Melbourne councils require a Level 1 or Level 2 report.
Development applications — Any building or subdivision application affecting trees needs a Level 4 assessment.
Insurance claims — After storm damage, insurers often require a report to verify the tree was hazardous.
Neighbour disputes — An independent report can help resolve disagreements about overhanging branches or root damage.
Pre-purchase assessments — Buyers may commission a report to understand the condition and potential costs of trees on a property.

What Does an Arborist Report Include?

Tree species identification
Dimensions (height, canopy spread, trunk diameter)
Health assessment (foliage condition, signs of disease or pest damage)
Structural assessment (defects, decay, lean, co-dominant stems)
Risk rating (likelihood and consequence of failure)
Useful life expectancy (ULE)
Retention value (low, medium, high)
Recommendations (retain, prune, monitor, remove)
Tree protection zone (TPZ) and structural root zone (SRZ) measurements
Site plan showing tree locations

How to Get an Arborist Report

Find a qualified consulting arborist — Ensure they hold a minimum AQF Level 5 Diploma of Arboriculture. Use our free matching service to connect with qualified professionals.
Request a quote — The arborist will need to know the number of trees, site address, and the purpose of the report.
Site visit — The arborist inspects the tree(s) in person. A Level 1 assessment typically takes 30–60 minutes per tree.
Report delivery — Most reports are delivered within 5–10 business days as a PDF document.

Frequently Asked Questions

What is an arborist report?

An arborist report is a formal written assessment prepared by a qualified arborist that evaluates one or more trees. It typically covers the tree's species, health, structural condition, risk assessment, and recommendations for management.

How much does an arborist report cost in Melbourne?

A basic arborist report for a single tree typically costs $300–$600. More complex reports for development applications can cost $800–$2,000+. The price depends on the number of trees, site complexity, and detail required.

Who can write an arborist report?

For council permit applications, the report must be prepared by a consulting arborist holding a minimum AQF Level 5 Diploma of Arboriculture. Councils generally will not accept Level 3 reports for permit purposes.

How long is an arborist report valid for?

Most councils accept arborist reports that are less than 12 months old. If significant weather events have occurred since the report was written, the council may request an updated assessment.

Do I always need an arborist report to remove a tree?

Not always. If the tree is below your council's size thresholds, is a declared weed species, or is dead, you may not need a report. However, for any significant or protected tree, a report is almost always required.