Resources
Match Your Project to the Right Arborist Report
Different situations call for different documents. This guide maps common scenarios to the correct service so you can start the right process the first time.
Situation Lookup
- Removing a specific private tree
- Tree Removal Report. Required before a removal permit application. Covers up to three trees per report.
- Building or developing near trees
- Construction Arborist Report. Full tree inventory plus a tree protection plan submitted with your building permit application.
- Stop-work order or contravention
- Stop Work Order Clearance. A site inspection plus a written report documenting current tree condition and any remedial work completed. Required to lift the city's order.
- Root work or excavation near a protected tree
- Root Pruning and Excavation. Pre-work root assessment and, where required by permit conditions, supervised root pruning with arborist sign-off.
- Clearing vegetation during nesting season
- Migratory Bird Risk Assessment. Used where an active-nest survey is appropriate or a project condition requires one. Documents the assessed area, method, observations, and next steps.
- Hazardous or declining tree
- Tree Risk Assessment. A structural condition evaluation used by property owners, insurers, and municipalities to document failure risk. Can support a removal application when the tree poses a hazard.
- Large site or development with many trees
- Tree Inventory. Site-wide tagging and condition assessment of all regulated trees, typically scoped before a planning application or site plan approval process begins.
- Butternut identified on site
- Butternut Health Assessment. Provincially mandated under the Endangered Species Act. Required before any impact to a butternut tree; determines whether the tree qualifies for an injury or destruction permit.
Report Types Compared
| Report Type | What Triggers It | What It Produces |
|---|---|---|
| Tree Removal Report | Application to remove a regulated tree on private property | ISA-standard written report with tree ID, condition rating, site plan, and replanting recommendation; submitted to the municipality |
| Construction Arborist Report | Building permit or development application near trees | Full site tree inventory, root protection zone calculations, protection plan with fencing specs, and monitoring schedule for the construction period |
| Site Inspection | Permit condition requiring arborist sign-off at construction milestones | Written inspection certificate confirming protection measures are in place; may trigger a compliance letter if conditions are not met |
| Risk Assessment | Concern about a tree's structural condition or failure potential | ISA Risk Assessment form rating likelihood of failure and consequence; used by insurers, property owners, and cities to document hazard status |
Not sure whether your project needs one of these or a combination? See Report vs. Inspection for a deeper comparison of those two documents specifically.
A Few Common Combinations
Some projects require more than one document. The most frequent pairings:
Home addition or renovation near a backyard tree
A construction arborist report for the building permit, followed by site inspections at intervals specified in your permit conditions. If the tree is ultimately removed to accommodate the build, the removal is covered under the same construction report rather than a separate tree removal report.
Vegetation clearing in spring or summer
Start with a migratory bird risk review to determine whether an active-nest survey is appropriate for the habitat and project conditions. A separate tree removal report may still be required for regulated trees.
Hazardous tree on a development site with a butternut present
A risk assessment for the hazardous tree, a butternut health assessment for any butternut on site, and potentially a full inventory if the site plan application requires one. The butternut assessment must be completed before any work that could impact the tree.
Frequently Asked Questions
- Do I need a permit or just an arborist report?
- For a regulated removal, the permit is the municipal approval and the arborist report is supporting documentation when the municipality requires it. Exempt trees and municipalities without a blanket private-tree bylaw may not require either. Check the applicable bylaw before booking a report.
- What is the difference between an arborist report and a site inspection?
- An arborist report is a written document prepared before work begins. It is submitted to the municipality as part of your permit application. A site inspection is an on-site visit during or after construction to verify that tree protection conditions are being met. Most construction projects require both: the report first, then inspections at key milestones.
- Which report do I need for a renovation near a tree?
- A construction arborist report. It includes a tree inventory, a root and canopy impact assessment, and a tree protection plan that your contractor must follow. This report is required for building permit applications whenever work occurs within the drip line or root protection zone of a regulated tree.
- Can I use a tree removal report for a construction project?
- No. A tree removal report addresses one or a small number of regulated trees and supports a removal permit only. A construction arborist report covers all trees affected by a development site, specifies which trees will be retained and how they will be protected, and satisfies building permit requirements. The two documents have different scopes and different audiences within the municipality.
- Is a risk assessment the same as a tree removal report?
- No. A risk assessment evaluates a tree's structural condition and the likelihood of failure. It is used when a property owner, insurer, or municipality needs a written opinion on whether a tree poses a hazard. A tree removal report supports a permit application to remove a regulated tree. A risk assessment can sometimes be part of the justification for removal, but the two documents serve different purposes.
- When do I need a nest clearance survey?
- An active-nest survey may be appropriate when tree or vegetation work cannot avoid a period of elevated nesting activity, or when a permit, contract, or environmental plan requires one. The right approach depends on habitat, species, project scope, and timing. Federal law protects migratory birds, eggs, and occupied nests, but does not impose one universal survey season.
Related Resources
Arborist Report vs. Site Inspection
The two documents serve different points in a project. Here is how to tell them apart.
Read the guide →Arborist Report Costs
Pricing breakdown for all report types in Toronto and the GTA.
Read the guide →All Services
Full list of arborist consulting services with descriptions.
View services →Independent Arborist vs. Tree Removal Company
Why the source of your report matters for permit approval.
Read the guide →Request a quote
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