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Owners and builders working near a big tree

Where is the tree?

Work out a tree's tree protection zone (TPZ), see how far your works encroach, and get a summary for council or your arborist. Free to read.

  • Free to read
  • No sign-up until the draft
  • Every fact cites its source
5 FT APN 018-224-07 ADU · 640 SQ FT

ePlan fills in

  • Lot boundary
  • Building footprint
  • Distance to works

How it works

Tree protection zone and encroachment summary, from one answer

  1. Enter the trunk measurements and where the works go.One answer starts the project. ePlan names it and looks up the place.
  2. ePlan works out the TPZ and SRZ and how far the works encroach.3 more questions, each with a "not sure yet" way out.
  3. Read the summary free, then download it for your arborist or council.The draft marks what to check (amber), what to pick (blue) and what to fill in (violet).

What you get

Tree protection zone and encroachment summary and 2 more documents

The first draft is free to read. Each document after it is drafted from the same confirmed facts.

The first draft

Tree protection zone and encroachment summary

  1. Tree, species and location
  2. Trunk measurements
  3. Tree protection zone (TPZ)
  4. Structural root zone (SRZ)
  5. Works and encroachment
  6. Protection during construction

Modeled on: AS 4970:2025 Protection of trees on development sites

Next · 2

Arborist report

  1. Tree health and structure
  2. Impact of works
  3. Protection measures
  4. Recommendations
Next · 3

Statement of Environmental Effects

  1. Site
  2. Proposal
  3. Planning controls
  4. Impacts

From public data

What ePlan fills in, and from where

12 ×

the trunk diameter at 1.4 m gives the tree protection zone radius under AS 4970:2025
Source: Hobsons Bay City Council

Questions

Tree Protection Zone Calculator: what people ask

How is the tree protection zone calculated?

Multiply the trunk diameter at standard height (DSH), measured 1.4 m above ground, by 12. AS 4970:2025 calls this measurement DSH; earlier editions called it DBH.

Source: hobsonsbay.vic.gov.au

Do I need an arborist?

If works may affect a tree's protection zone, councils such as Hobsons Bay advise using a qualified arborist to assess the tree and how to protect it.

Source: hobsonsbay.vic.gov.au

Can a tree removal permit be fast-tracked in Victoria?

Sometimes. Tree removal is one of the kinds of application VicSmart can cover, depending on the zone and overlay. Council decides VicSmart applications within 10 business days.

Source: planning.vic.gov.au

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Tree Protection Zone Calculator: start with one answer

Answer it and the project exists. Three more questions, then the draft.