What is adverse possession and how long does someone need to occupy land to claim it?

What the Law Says

Adverse possession is not governed by a single federal law in Canada — instead, each province sets its own rules through limitations statutes and land registration systems. The core idea is that long, open, and exclusive possession without the true owner’s consent can extinguish their right to reclaim the land.

In provinces with a land titles system (e.g., Alberta, British Columbia, Ontario), adverse possession claims are severely restricted or eliminated for registered land. For example, under Ontario’s Land Titles Act, once land is registered, adverse possession generally cannot override the registered owner’s title — unless very narrow exceptions apply.

Where adverse possession remains possible, the required time period depends on whether the land is under the Registry System (older system) or Land Titles System, and on provincial legislation. Most provinces require 10 to 20 years of continuous, open, notorious, exclusive, and adverse possession.

Crucially, the possessor must occupy the land as if they were the true owner — paying taxes, fencing, cultivating, or otherwise acting in a way inconsistent with the real owner’s rights. Mere use (e.g., walking across land) or secret occupation does not qualify.

What Courts Have Said

The Supreme Court of Canada has clarified key principles about adverse possession — especially how it interacts with tax sales and commercial leases — reinforcing that possession must be truly adverse and legally sufficient to displace existing interests.

What to Do

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