Fence Bylaw Guide in Niagara Region, Ontario

A shared boundary fence between two properties raises a different question than "is my fence tall enough." Here is the process, in order. Step 1: check your municipal height and setback bylaw first. Fences are governed by municipal zoning by-laws, not an Ontario Building Code permit the way a deck or shed can be. In Niagara Falls, the confirmed by-law maximum is 2.5 m (about 8'2") in the rear yard and 1 m (about 3.28 ft) along the front-yard side; we have not confirmed the equivalent St. Catharines or Niagara-on-the-Lake figures, so check your own municipality's by-law directly rather than assume Niagara Falls' numbers apply. If your lot is on a corner, expect a stricter front/side limit than a mid-block lot, for sight-triangle visibility at the intersection. Step 2: confirm whether the fence sits on a shared boundary. Ontario's Line Fences Act only applies to a fence built ON the line between two properties, not a fence built entirely on your own side of the line. Step 3: if it is a shared boundary fence, put the cost-sharing in writing BEFORE work begins. Under the Line Fences Act, a neighbour CAN be compelled to share the cost of a boundary fence, but only if that cost-sharing is agreed, or formally noticed, in writing before construction starts. Skip this step and build first, and you generally cannot go back and force your neighbour to pay afterward. The timing of the written agreement or notice is what the Act actually turns on, not just whether the fence benefits both properties. Step 4: if your neighbour disagrees, know that the municipality appoints "fence-viewers" to resolve it, not a court, as the first-line process. Step 5: confirm the current bylaw and process with your own municipality before you build; Niagara Falls, St. Catharines, and Niagara-on-the-Lake each administer their own building department and by-laws, and a rule can change. See ontario.ca/page/line-fences-act for the Act's full text and process.