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What changes the answer.
Start with these conditions. The official reference is attached to each one.
Vaughan lists retaining walls less than one metre high among projects that do not require a building permit.
Vaughan identifies retaining walls over one metre adjacent to public property, building access or publicly admitted private property as designated structures.
The designated-structure inspection guidance includes retaining wall inspection stages.
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Fees and timing
Next steps
- Measure exposed wall height
- Confirm location relative to public/access areas
- Prepare structural details if designated
- Submit before construction when the trigger applies
Same project, different city
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