What is a Tree Protection Zone?

Anelia Tichkova • March 31, 2026

Anelia’s Tree Corner

Interesting facts and tree care tips from certified arborist Anelia Tichkova

A Tree Protection Zone (TPZ) in the Town of Oakville is the designated area around a tree that must remain completely undisturbed during construction or site activity. Its purpose is to safeguard the tree’s roots, trunk, and canopy from damage caused by excavation, equipment, grading, or compaction.


Situations Where Tree Protection Is Required:


  • Any construction near trees, including additions, garages, decks, pools, driveways, grading, or utility work.
  • Before removing a private tree that is 15 cm or larger in diameter, since a permit and inspection are required.
  • When applying for building or development permits, if trees are present on or near the site.
  • When work may disturb soil, such as excavation, trenching, or heavy equipment movement.
  • When storing materials or equipment on a site where trees could be affected.


Why the Town Requires a TPZ?


  • Protect the urban forest and maintain canopy cover.
  • Prevent root damage, soil compaction, and trunk injury during construction.
  • Ensure healthy, stable trees remain on both private and public lands.


What is the size of the TPZ?


  • The size of the TPZ is typically based on the diameter of the tree, with larger trees requiring larger protected areas.
  • The town may impose higher standards depending on the tree’s size, species, health, and site conditions.


Where can I learn more about compliance with Oakville’s tree protection policies and permit requirements?


In 2024, the Town of Oakville announced updates to its Private Tree Protection bylaw, which aim to further support Oakville’s goal of 40% tree canopy cover by 2057.


Read more about the updated by-law in the staff report to council from March, 2024 here:

https://pub-oakville.escribemeetings.com/filestream.ashx?DocumentId=67697


Sources:



The Town of Oakville. (n.d.). Town tree protection during construction procedure.. Retrieved January 5, 2026, from https://www.oakville.ca/town-hall/policies-procedures/tree-protection-and-tree-canopy-preservation-policy/town-tree-protection-during-construction-procedure/

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