What the current Delta source says
Open the official Delta source ↗Delta says standard residential fences that comply with zoning generally do not need a permit. Its residential page summarizes 1.8 m behind the minimum front setback and a step-down to 1.2 m in front, with special cases for some zones and adjacent uses.
From bylaw to the Delta lot
For a shared boundary, decide where the fence will physically sit before discussing height. Ownership and municipal fence compliance are different issues.
An allowed fence location is not proof of land ownership. Confirm the legal boundary when placement is close enough to matter.