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The Official Site of The City of Markham

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You will need a building permit from our Building Department for some backflow preventer work.

These jobs require a building permit:

  • Installation of a new testable backflow preventer
  • Replacement of an existing testable backflow preventer
  • Relocation of an existing testable backflow preventer

This job does not require a building permit:

  • Install, replace or relocate a non-testable backflow preventer
  • Remove an existing testable backflow preventer. You should still submit a Backflow Preventer Removal Form and get the City's approval before you start the removal.

Please visit our Building Permits section or contact our Building Department at 905.475.4870 for details.

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