How do I calculate the Tree Protection Zone?

Measure the trunk diameter at 54” above grade and multiply it by 10. For trees with more than one stem (arising at or below 54 inches) the trunk size shall be measured at the smallest diameter point below the main union of all stems unless the union occurs below grade, in which case each stem shall be measured as a stand-alone tree. For oak trees, if one stem is ten inches or more in diameter, the tree will constitute one Heritage Tree. For all other species, if one stem is fifteen inches or more in diameter, the tree will constitute one Heritage Tree. Use the Tree Diameter Measurement Guide to measure the trunk diameter of any tree.

Show All Answers

1. What is an Existing Tree/Major Vegetation?
2. Is the Tree Protection Plan the only requirement for development regarding Protected Trees?
3. Why trees should be protected?
4. Can the City Arborist provide recommendations for development projects?
5. What is an ISA Certified Arborist?
6. What is a Project Arborist?
7. Is a Tree Protection Plan always required when building near a Protected Tree?
8. What happens if a Protected Tree is damaged?
9. How do I calculate the Tree Protection Zone?
10. When is an Arborist Report required?
11. Is the Arborist Report and TPP the same thing?
12. What is the format of an Arborist Report?
13. Is a permit required to remove Protected Trees?
14. Where can I apply for a tree removal permit?
15. Where can I get answers to additional questions?