Tool · Inspection cycle
Tree inspection frequency calculator
Inspection cycles should vary with structural risk band and target zone. Choose both below and the calculator returns a starting cycle, with the events that should still trigger out-of-cycle visits.
How to use
Risk band × target zone
The two dimensions that most reliably shape a defensible inspection cycle. The calculator is a starting point — adjust to your council's species mix, climate and resources. Document the table you settle on and apply it consistently.
Step 1 · Structural risk band
What is the tree's current structural risk band?
The rating from the most recent inspection using your council's documented framework. If unsure, choose the band that best describes the tree today.
Step 2 · Target zone
What is beneath and around the tree?
The use of the area the tree could affect if it failed. The consequence side of risk is as important as the likelihood side.
Result
Choose a risk band and a target zone above
The recommended inspection cycle will appear here once both are selected.
Triggers that override the cycle
Cycle is the baseline — these events should bring an inspection forward
- A resident report flagging concern about the tree
- A storm event in the precinct
- Adjacent works that may have disturbed the root zone
- A visible change observed by parks or contractor crews
- An approaching anniversary of an identified high-risk action
Read further
These are starting points, not standards. The full article covers how to apply the table consistently, document the choice, and pair it with an aging follow-up list.
Read the full articleWant a defensible inspection program end-to-end?
The asset management guide expands on inspection cycles, methodology documentation, the link to work orders and risk follow-up — structured for the way Australian councils actually operate.