Spent most of last summer navigating a boundary fence dispute with our neighbour in Mississauga. Sharing what I learned about Ontario fence rules for anyone in a similar situation.
The Situation
Our shared rear fence (about 80 linear feet) was a 25-year-old rotting wood fence on the exact property line. Neighbour refused to share the cost of replacement. I did not know what my options were.
What I Found: Ontario Line Fences Act
The Line Fences Act gives both property owners the right to have a fence on a shared line. Costs are split based on equal benefit - so unless one party benefits significantly more, it’s a 50-50 cost split by default.
The Process
If you cannot reach agreement with your neighbour, you can apply to the local municipality for a fence viewer hearing. Fence viewers are municipal officers (not a court) who adjudicate disputes and can order both parties to contribute to construction. The process costs about $100-$200 in fees.
Our Resolution
Filed for fence viewer hearing. Neighbour agreed to 50-50 split before the hearing was even scheduled - apparently many neighbours come to agreement once they realize there is a formal process.
Final fence cost: $7,200 for 80 ft of 6-ft cedar with post caps. Each paid $3,600.
Height Rules in Mississauga
Rear yard: max 2.0m (6’6"). Front yard: max 1.0m. Side street on corner lot: max 1.2m. These match most GTA municipalities.
Key Takeaway
You do not have to fund a shared fence yourself. The Line Fences Act exists specifically to prevent that. Apply early if your neighbour is unresponsive.