Arborist Reports Explained: What's Included And When You Need One

An arborist report is a formal written assessment prepared after an arborist inspects a tree or group of trees. Unlike a general discussion about tree work, the report documents findings that can be referred to by property owners, councils, insurers and other parties involved in making decisions about the site.

The exact content will depend on why the assessment has been requested. However, the purpose is generally to provide clear evidence about the tree and its condition rather than relying on assumptions based on its size, appearance or position.

An arborist may assess:

• Tree species & identifying characteristics
• Overall health & condition
• Structural integrity
• Visible disease, pests or damage
• Potential hazards & risk factors
• Interaction with buildings or other structures
• Site & environmental considerations
• Appropriate management recommendations

The resulting document creates a more complete picture of what is happening with the tree and what action, if any, may be appropriate

This distinction can cause confusion. A quote and an arborist report might both involve someone looking at a tree, but they are prepared for very different purposes.

A quote is primarily concerned with the proposed work and what that service will cost. It might contain general observations about the tree, but it is not intended to provide the same level of assessment or documentation as a formal report.

An arborist report carries considerably more detail. It can document:

• What was inspected on site
• The condition of the tree
• Identified structural or health concerns
• Relevant risks
• Photographic evidence
• Professional recommendations

This distinction becomes particularly important when documentation is required for council, insurance, legal or safety purposes. A job estimate generally cannot replace a formal assessment simply because both documents relate to the same tree.

Confusing a quote with a formal arborist report is a common reason applications are returned with requests for further information. Before arranging an inspection, confirm what the receiving organisation requires so you don't spend money on a document that won't provide the necessary evidence

Council requirements are one of the more common reasons property owners encounter arborist reports. Tree removal or substantial work cannot always proceed based solely on a property owner's preference, particularly where planning controls or vegetation protections apply.

An arborist report for council may be relevant when:

• A tree is proposed for removal
• Significant alteration or pruning is planned
• A tree may be affected by proposed development
• Vegetation controls apply to the property
• A tree sits close to a boundary or structure
• Evidence of a hazard or structural problem is required

Requirements can vary according to factors such as zoning, tree species and proximity to buildings or public areas.

The arborist's role is to assess and document the tree's condition. The report can then form part of the information considered during the relevant application or approval process. It is worth confirming what documentation is required before arranging tree work, particularly if the tree forms part of a broader development proposal.

Trees can become an important consideration well before construction begins. Existing vegetation may influence how a site is planned, where structures can be positioned and whether particular trees can reasonably be retained.

An arborist assessment can provide information about:

• Existing tree species
• Tree health & structural condition
• Potential risks around the proposed work
• Environmental considerations
• Interference with structures
• Whether pruning, management or removal may be appropriate

For small-scale developers, obtaining this information at the appropriate stage can make it easier to understand the tree-related conditions of a site before decisions progress too far.

The report does not simply exist to justify removing a tree. An assessment may also identify trees that can be retained or managed through appropriate maintenance. The recommendations should reflect what the arborist finds during the inspection rather than beginning with a predetermined outcome

Insurance matters can also create a need for formal documentation. A tree may have fallen, suffered storm damage or developed a structural problem that raises questions about its condition and the risk it presents.

In these circumstances, photographs alone may not provide enough information to explain what has happened. A formal report can record the arborist's observations and provide a professional assessment of the tree at the time of inspection.

Depending on the circumstances, documentation may cover:

• Visible damage to the tree
• Structural defects or instability
• Tree health
• Potential hazards
• Site conditions
• Photographic evidence
• Recommended action

Arborist reports may be prepared for insurance purposes as well as council applications and development approvals.

Before booking an assessment specifically for a claim, check what information your insurer has requested. That helps ensure the arborist understands the reason for the report and can prepare documentation relevant to the situation

There is no single arborist report cost that applies to every property. The amount of work involved depends on the site, the number of trees requiring assessment and the purpose and complexity of the report.

Factors that can influence how much an arborist report costs include:

• Number of trees being inspected
• Complexity of the site
• Level of assessment required
• Purpose of the report
• Amount of documentation needed
• Specific requirements from council, an insurer or another organisation

A straightforward assessment of one tree is naturally different from documenting several trees across a development site.

This is another reason to explain why you need the report when making an enquiry. Rather than requesting a generic tree assessment, provide any relevant information about the application, claim or proposed work so the arborist can establish what needs to be inspected and documented

The report is often one stage in a larger process. Once the inspection findings have been documented, they may support an application, provide information to an insurer or help determine what should happen to the tree next.

Depending on the findings, the next step might involve:

• Retaining & monitoring the tree
• Carrying out appropriate pruning
• Managing identified hazards
• Completing ongoing tree maintenance
• Removing the tree where appropriate
• Using the report as supporting documentation

Where removal is recommended and the necessary approvals are in place, professional tree removal can then be planned around the findings in the report. The same applies when pruning or ongoing maintenance is recommended rather than complete removal.

The important point is that the report comes before assumptions about the solution. Its job is to document what is actually happening with the tree so the next decision can be based on the findings.