Legal Non-Conforming (“Grandfathered”) Uses in Ontario

What is a Legal Non-Conforming Use?

Imagine purchasing a charming long-standing bed & breakfast (B&B). After temporarily closing for renovations, you discover the municipality now prohibits short-term accommodations on your street. Can you reopen?

Under subsection 34(9) of the Ontario Planning Act, if the B&B was lawfully operating before the zoning amendment, it can continue as a legal non-conforming use. This “grandfathered” status allows the use to continue but only if operations remain consistent.

Note: Temporary closures for renovations are generally fine. Permanent changes to the use, like converting the B&B to a private residence, can eliminate your grandfathered rights.

Does the Protection Apply to the Entire Property?

Legal non-conforming rights attach to the land, building, or structure, not the owner.

  • Transferable Rights: A future purchaser can continue operating the B&B.
  • Expanding the Use: Rights can extend within the existing building (e.g., from one floor to the whole house), but any additions or expansions beyond the building require municipal approval.

For open-air operations (like farms or yards), rights typically attach to the land itself. Courts may allow expansion across the property if there’s evidence of a pre-existing intent to grow.

How Much Change is Allowed?

The Supreme Court of Canada sets clear limits:

  • The original purpose of the use defines the scope.
  • Intensification is permitted if it doesn’t fundamentally alter the nature or community impact.
  • Expansion beyond the original activity is generally not protected.
  • Minor accessory uses consistent with the original purpose may be allowed.
  • Evidence of neighbourhood effects matters.

In short: grandfathered rights are flexible but must remain connected to the original lawful use.

Conclusion

Grandfathered rights are valuable but conditional:

  • Keep a clear paper trail proving lawful use.
  • Avoid long interruptions in operation.
  • Understand that protection usually extends only through the existing building unless municipal approval is obtained.

Brian Madigan LL.B., Broker
www.OntarioRealEstateSource.com

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