Boundary fences between two homes in Ontario are governed by the provincial Line Fences Act, which sets out an arbitration process for adjoining owners who cannot agree on building, repairing, or replacing a shared fence. There is no blanket rule that a neighbour must pay half, and the familiar "good side facing out" custom is generally an etiquette and by-law matter rather than a province-wide law. Day-to-day limits on height and pool fencing come from your municipal by-law, not the Act.
This guide explains how the Line Fences Act works, who pays for a line fence, where property lines fit in, and how the "good side" custom is handled in the Greater Toronto Area. It is general information for GTA homeowners, not legal advice. Confirm the current rules with your municipality before you build.
What the Line Fences Act Covers
Ontario's Line Fences Act applies to "line fences" - fences located on the boundary between two adjoining properties. It provides a structured arbitration procedure for when neighbours cannot agree, and it applies in most organized municipalities unless a local by-law replaces its cost-allocation rules.
The Act's arbitration process is only meant for two situations:
- There is currently no fence on the boundary and one owner wants one constructed.
- A boundary fence already exists and one owner believes it needs reconstruction or repair.
Disputes about a fence built entirely on one owner's land, or purely about appearance where there is no shared boundary fence, generally fall outside the Act. Those are handled under municipal fence by-laws and ordinary civil law instead.
Fence-Viewers and the Dispute Process
When neighbours genuinely cannot agree, either owner can ask the municipality to appoint fence-viewers - typically a panel of neutral people familiar with local conditions. They attend a viewing of the site and issue a written award. Fence-viewers decide two things: how responsibility and cost are split, and the description of the fence to be built, including materials and specifications.
Their award is binding unless it is appealed through the statutory process, and it allocates both the cost of the fencing work and the administrative cost of the viewing itself. Municipalities stress that owners should first try to settle the matter informally - the fence-viewing process carries application fees and can cost more than simply working it out.
Who Pays for a Line Fence
The Act's default principle is that where a boundary fence is warranted, adjoining owners share responsibility for building and maintaining it, in proportions set by the fence-viewers. That split can be by length (each owner builds and maintains half), by cost ratio (for example 50/50), or, in specific circumstances, assigned mostly to one owner.
The key point: there is no automatic provincial or federal rule forcing your neighbour to pay half of any fence. Cost obligations depend on the Act, on local by-laws, and on the facts of the dispute. Municipal councils can also pass by-laws that exempt all or part of the municipality from the Act's cost-allocation provisions and set their own apportionment rules - Vaughan's Fence Apportionment of Costs By-law is one example. Always check whether the Act still governs cost-sharing where you live, or whether a local by-law does.
Property Lines and Building on Your Own Side
The Act applies only to fences on the boundary line itself - not to fences set back entirely within one owner's property. If you build a fence fully on your own side of the line, you usually control its design and pay for all of it, but you must still follow municipal rules for height, materials, sightlines, and pool enclosures.
Building on your own side generally does not require your neighbour's consent. Building on the actual property line usually presumes shared ownership and can trigger the Line Fences Act process or municipal cost-apportionment rules, especially if you later seek a contribution from your neighbour. Because boundary mistakes are expensive - even a few inches of encroachment can lead to removal demands or legal claims - review an existing survey, or hire a licensed Ontario surveyor, before setting posts near the line. If posts are already failing, start with fence post replacement before adding new panels.
The "Good Side" of the Fence
Many fences, particularly wood privacy fences, have a finished decorative side and a plainer structural side with exposed posts and rails. The Line Fences Act does not dictate which way the finished face must point. Orientation is a matter of municipal by-law, neighbourhood custom, or agreement between neighbours.
Where one owner builds a boundary fence on their own, the common courtesy - and in some municipalities a by-law expectation - is to face the finished side toward the neighbour. Even where it is not a formal rule, facing the good side outward signals goodwill and heads off complaints. If the fence is set back entirely on your own land, you have more flexibility, but the structure must still meet height limits and create no safety hazard. Discussing orientation early is the simplest way to keep the "good side" from becoming the centre of a dispute. Our crews finish both sides cleanly on wood fence installations so this is rarely a sticking point.
Attachments, Painting and Modifying a Shared Fence
If a fence is jointly owned on the property line, you generally should not materially alter or overload it - painting, staining, attaching lattice or privacy screens, or mounting planters and trellises - without your neighbour's agreement, because those changes can affect maintenance duties and structural integrity. Where you built and fully own a fence on your own side, you have more latitude, but you still must avoid safety risks and any encroachment onto the neighbour's land.
Several municipalities regulate privacy screens and decorative toppers separately from ordinary fences, with their own height and setback rules. Adding height or a lattice topper to an existing fence can quietly convert a compliant fence into an over-height structure that needs a variance - so check the by-law first.
How Municipal By-laws Interact with the Act
In practice, a boundary fence question involves three layers: the Line Fences Act (dispute resolution and cost-sharing), any local line-fence or apportionment-of-costs by-law, and the general zoning and fence by-laws that govern height, materials, and pool safety. Those technical standards apply whether the fence is on the boundary or within one property, and where rules conflict the stricter standard usually prevails - especially around pool enclosures.
That is why compliance comes before cost-sharing: make sure a proposed shared fence is allowed under your city's by-law first, then negotiate who pays. Our companion guide breaks the technical limits down city by city - see fence height and permit rules across the GTA.
Frequently Asked Questions
Does my neighbour have to pay for half of a new fence? Not automatically. Cost-sharing of a boundary fence is determined through the Line Fences Act process or a local by-law, not a blanket 50/50 rule. Fence-viewers apportion costs based on the circumstances, and some municipalities have their own apportionment by-laws.
Can I force my neighbour to repair a deteriorating boundary fence? If the fence sits on the property line and you believe it needs reconstruction or repair, the Act lets you apply for fence-viewers to assess it and issue a binding award, including cost allocation. You are expected to try to reach agreement first.
What if my municipality has exempted itself from the Act? The Act allows councils to pass by-laws exempting the municipality from its cost-apportionment provisions and adopt local rules instead. In those areas, cost disputes are governed by the by-law rather than the Act.
Can I build a fence entirely on my side without involving my neighbour? Yes, provided it is on your property (not the boundary) and complies with municipal height, placement, and pool enclosure rules. Your neighbour is typically not responsible for any cost, and it is treated as your fence.
Does the Act decide what materials or style I must use? Fence-viewers can specify the general description and materials in their award, but overall design and material rules - such as pool enclosure requirements - come from municipal by-laws, not the Act.
What is a fence-viewing and how much does it cost? It is a site visit where arbitrators hear both owners and issue a written award covering the fence type, materials, cost division, and maintenance. There are application fees, and the award also splits the administrative cost of the viewing.
Planning a Shared or Boundary Fence in the GTA?
The cleanest way to avoid fence-viewers and disputes is to get the design and placement right from the start. We help GTA homeowners verify the property line before digging, assess whether to repair or replace an existing fence, and propose neighbour-friendly designs that orient the good side correctly and respect local height and sightline rules. If a fence is failing, our fence repair services keep it safe and compliant before it becomes a neighbour problem.
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Planning a Shared or Boundary Fence?
We help GTA homeowners place fences correctly on the property line, finish the good side properly, and stay compliant with local by-laws - so neighbours never need fence-viewers.
