Adverse Possession Explained

Adverse possession is one of the more unsettling concepts in Australian property law for the average buyer or seller, because it describes a genuine way to lose land you legally own, or gain land you never formally purchased. In simple terms, it allows a person who has occupied someone else's land openly, exclusively and continuously for a long statutory period to eventually apply to be registered as the owner, displacing the original title holder. It sounds unlikely, but boundary fences built in the wrong place, driveways shared for decades, and forgotten strips of land make it more common than most people expect.

What Adverse Possession Means in Practice

At its core, adverse possession recognises that long, uninterrupted occupation of land can eventually override the paper title. If someone treats a portion of land as their own without permission from the true owner, and keeps doing so for years without challenge, the law will eventually treat that occupation as more significant than what the certificate of title says. This is not usually a loophole exploited deliberately. It most often arises from an honest mistake, such as a fence built slightly over the true boundary decades ago, rather than a calculated attempt to take someone else's land. Battle-axe blocks, rural boundaries defined by old wire fencing, and older suburban lots where a garden shed or driveway crept over the line are the settings where this doctrine tends to surface in practice.

The Legal Tests That Apply

To succeed, a claimant generally needs to show their possession was open, meaning not hidden from the true owner, exclusive, meaning not shared with the registered owner or the public, continuous, meaning without meaningful gaps, and adverse, meaning without the owner's permission. Casual or intermittent use, such as occasionally parking on a neighbour's verge, will not meet this standard. Land registries and courts scrutinise these elements closely, because the effect of a successful claim is the permanent loss of someone else's registered property right.

How Long the Occupation Must Continue

The required period is set by each state's limitation of actions legislation and is measured in a long run of unbroken years, not months. In New South Wales, an occupation of privately owned land generally needs to run for well over a decade to support a claim, with a considerably longer period required where the land is held by the Crown. Other states apply broadly similar principles under their own legislation, but the exact timeframe should always be confirmed against the relevant state's current law rather than assumed from another jurisdiction, and anyone facing a genuine occupation dispute should get advice from a solicitor rather than relying on general information alone. The clock generally only starts once possession becomes genuinely adverse, so periods where an occupier had the owner's permission, even informally, do not count towards the total.

Why This Matters When Buying a Property

For buyers, adverse possession usually surfaces as a fence, driveway or garden bed that does not follow the surveyed boundary shown on the plan, or occasionally as a title already affected by a possessory title application. A title search will not necessarily flag an informal encroachment that has not yet ripened into a legal claim, which is why a current survey and a careful visual inspection against the deposited plan matter more than most buyers assume for a residential purchase. If part of the land you are buying looks like it has been occupied by a neighbour for a long time, raise it with your conveyancer before you exchange. This is particularly worth checking on older infill lots, rural properties with informal boundaries, and any block where the fence line clearly does not follow a straight surveyed edge.

Why This Matters for Sellers and Long-Term Owners

For owners, the risk runs the other way. If you have allowed a neighbour uninterrupted use of a strip of your land, whether through inattention or good-natured tolerance, you may unknowingly be exposing yourself to a future claim. The safest protection is to formally document the true boundary or grant a written licence rather than silent tolerance, since documented permission defeats the adverse element of any later claim. Owners preparing for a property transfer or sale should resolve any obvious boundary discrepancy beforehand, because an unresolved encroachment can complicate a transaction and unsettle a buyer's confidence in the title.

How a Claim Is Actually Made

An adverse possession claim is not automatic. The occupier must apply to the relevant state land titles office to be registered as the new proprietor, supported by a survey plan establishing the exact area claimed and statutory declarations from independent witnesses confirming the nature and length of the occupation. According to NSW Land Registry Services' guidelines on possessory title applications, the process also requires the applicant to demonstrate who would otherwise be entitled to the land, and the application is publicly notified so the registered owner and other interested parties can object, including by lodging a caveat. This public notification step is one of the main safeguards built into the system, and it is why long-dormant occupation can suddenly become an active dispute once a property changes hands or is surveyed for a renovation.

What Your Conveyancer Checks

Because adverse possession sits at the intersection of title, survey and limitation law, a conveyancer handling your purchase or transfer in New South Wales or any other state will typically compare the physical occupation of the land against the deposited plan, check the title search for any pending possessory title applications or related caveats, and flag fencing or access arrangements that do not match the paper boundary. Catching this before settlement is far cheaper and far less stressful than discovering it afterwards.