Boundary Fence Disputes in NSW: What the Dividing Fences Act Means for You and Your Neighbour

A leaning fence, a rotted post, or a neighbour who wants a very different style than you do boundary fence disagreements are one of the most common (and most avoidable) sources of friction between neighbours in Sutherland. The good news is that NSW has clear legislation covering exactly this situation. Understanding how the Dividing Fences Act actually works before you approach your neighbour can turn a potentially awkward conversation into a straightforward, fair process for both parties.

What the Dividing Fences Act Actually Covers

The Dividing Fences Act 1991 (NSW) sets out how the cost of a shared boundary fence should generally be split between neighbouring property owners and what happens when they can't agree. The core principle is straightforward: where a fence is needed, both owners typically share the cost of a "sufficient dividing fence" equally, regardless of who wants the fence more or who happens to have deeper pockets. What often surprises people is that the Act applies whether the existing fence has fallen into disrepair, is missing entirely, or simply no longer meets a reasonable standard for the area.

What Counts as a "Sufficient" Fence

This is where most disputes actually begin. A "sufficient dividing fence" under the Act is judged by local standards, not by what either neighbour personally prefers. If your existing fence is a standard timber fence and your neighbour wants to upgrade to something like a brick fence or an elaborate picket fence, they're entitled to do that, but they generally can't force you to pay more than the cost of a standard, adequate fence for the area. Any difference in cost for upgraded materials, height, or styling is usually the responsibility of whoever wants the upgrade, not something split 50/50 by default.

The Notice Process: Why It Matters

Before any cost-sharing obligation is enforceable, the Act expects one neighbour to formally notify the other of the proposed fencing work, generally through a written fencing notice outlining the type of fence, estimated cost, and the contractor being used. Skipping this step is one of the biggest reasons disputes escalate a neighbour who wakes up to a fence being built with no prior notice and then receives an invoice for half the cost is far more likely to push back than one who was consulted from the start and had a chance to raise concerns or get their own quotes.

Retaining Walls and Fences on a Slope

Sutherland has plenty of sloped and terraced blocks, and boundary fences that sit on or near a retaining wall introduce a layer of complexity the Act doesn't spell out in detail. This is often where Colorbond fencing is worth considering, since it can be engineered to sit cleanly on top of a retaining structure without the same footing requirements as heavier materials. Generally, responsibility for the retaining structure itself sits separately from the dividing fence obligations, and mixing the two up is a common source of confusion. If your boundary involves a retaining wall, it's worth getting clarity on which structure is actually being discussed before assuming standard 50/50 fencing rules automatically apply.

Getting a Neutral Quote Helps More Than People Expect

A lot of boundary disputes soften considerably once both neighbours are looking at the same written quote rather than differing assumptions about cost. Getting an independent, itemised quote for a standard fence gives both parties a clear, neutral reference point for the notice process and often removes the guesswork that causes disagreements to drag on. It also gives you something concrete to bring to NCAT if the matter does need to go that far.

Need an independent quote to kick off the notice process with your neighbour? Explore our fence panels, privacy screens, and timber fences options; learn more about us, or contact us for a clear, itemised quote you can share with your neighbour.

Frequently Asked Questions

Do I always have to split the cost of a boundary fence 50/50 with my neighbour?

In most cases, yes, for a standard, sufficient dividing fence. However, if you want a more expensive or elaborate fence than a standard one, you're generally responsible for the difference in cost, not your neighbour.

What happens if my neighbour refuses to respond to a fencing notice?

If a neighbour doesn't respond within the notice period or refuses to cooperate, you can apply to NCAT for a fencing order, which can determine the appropriate fence type, cost split, and timeframe without needing their agreement.

Who is responsible for a boundary fence damaged by a storm or fallen tree?

This depends on the circumstances, including whether the tree was on one property or shared, and whether normal wear and tear versus negligence is involved. It's worth documenting the damage and discussing responsibility with your neighbour early, since these situations often fall outside the standard cost-sharing rules for planned fence replacement.

Can I build a fence taller or different from my neighbour's preference if I'm paying for it myself?

Generally, yes—if you're covering the extra cost above a standard sufficient fence yourself, you have more flexibility on style and height, subject to any council height restrictions or bylaws that apply to your property.