No single person came up with squatters’ rights. The doctrine known in law as adverse possession developed over roughly 2,500 years, beginning with Roman lawmakers around 450 BC, formalized by the English Parliament in 1623, justified philosophically by John Locke in 1689, and absorbed into American state law as the country expanded westward. At each stage, legislators reached the same practical conclusion on their own: land left idle serves no one, and an owner who ignores their property for decades has a weaker claim than the person actually using it.
The Roman Starting Point
The earliest formal version of the rule appears in the Twelve Tables, the foundational legal code of the Roman Republic drafted around 450 BC. Roman jurists called it usucapio, meaning ownership acquired through length of possession. A person who held movable goods for one continuous year became their legal owner. Land required two years of uninterrupted possession before title transferred.1LacusCurtius. Usucapio
The purpose was economic. Rome depended on land being farmed, built on, and traded, and when ownership records were lost or disputed, property could sit in legal limbo for generations. Usucapio put a deadline on an absent owner’s silence. Disappear for two years while someone else worked your fields and you lost the right to reclaim them.
Roman lawmakers also built in limits. Stolen property could not be claimed through usucapio, and the possessor generally needed a good-faith belief that their possession was legitimate. Those guardrails kept the rule from functioning as a license for outright theft, a balance every later system would have to strike in its own way.
English Parliament and the Limitation Act of 1623
After Rome fell, the idea survived in scattered local customs across Europe until English lawmakers formalized it through statute. The first notable step came in 1275, when the Statute of Westminster barred any action based on possession before 1189. It was a blunt fix, creating an 86-year window for disputes rather than a rolling deadline.
The real breakthrough was the Limitation Act of 1623. Parliament set a clean 20-year deadline: a landowner who failed to reclaim their property within 20 years of someone else occupying it lost the right of entry permanently. The statute’s language left no room: any person who did not enter their land within the window would be “utterly excluded and disabled from such Entry after to be made.”2vLex United Kingdom. Limitation Act 1623 No extensions, no exceptions.
Post-feudal England was tangled in ancient claims that made buying, selling, and developing land unreliable. By forcing owners to act within a fixed period or lose their rights, Parliament cleared the backlog and made real estate markets more predictable. The 20-year model became the template that England’s colonies, including the American ones, would later adopt.
England itself eventually shortened the period to 12 years in 1874 and then overhauled the system with the Land Registration Act 2002. Under the modern English regime, a squatter on registered land must apply to the Land Registry after 10 years, at which point the registered owner is notified and given a chance to object. If the owner objects, the application is rejected and the squatter gets two more years to remain. Only if the owner still takes no action after that second window does the squatter gain title.3GOV.UK. Practice Guide 4: Adverse Possession of Registered Land
John Locke and the Philosophical Case
The strongest intellectual defense of the doctrine came from John Locke’s Second Treatise of Government, published in 1689. Locke argued that ownership begins when a person mixes their labor with a natural resource: “as much Land as a Man Tills, Plants, Improves, Cultivates, and can use the Product of, so much is his Property. He by his Labour does, as it were, inclose it from the Common.”4University of Chicago Press. Property: John Locke, Second Treatise
The other half of Locke’s argument is what made it so relevant to adverse possession. He was equally clear that letting land go to waste destroyed an ownership claim. If a person fenced land but let the fruit rot and the grass die, that enclosed land “was still to be looked on as Waste, and might be the Possession of any other.”4University of Chicago Press. Property: John Locke, Second Treatise Ownership, in Locke’s framework, was an ongoing relationship between a person and the land they worked. Stop working it and the moral basis for your claim disappeared.
Locke was not writing about adverse possession specifically. But his labor theory gave courts and legislators a vocabulary to justify what statutes of limitation were already doing. When a squatter farmed abandoned land for 20 years while a titled owner collected rent elsewhere, Locke’s framework said the squatter had the stronger moral claim. That reasoning echoed through American property law for centuries and still surfaces in judicial opinions.
American Adoption and the Frontier
American states inherited the English 20-year model, but conditions on the continent pushed the doctrine in new directions. Vast stretches of territory had no clear documentation of ownership. Speculators bought enormous tracts and left them idle. Settlers moved west faster than surveyors could draw maps. In that environment, adverse possession was more than a backstop against negligent owners. It became an engine for economic development.
The federal government took the logic a step further with the Homestead Act of 1862, which turned the squatter concept into official policy. Any citizen over 21 could claim 160 acres of unappropriated public land by filing an application, paying a $10 fee, and living on the property for five years while cultivating it. At the end of that period, the homesteader received a patent from the government granting full title.5National Archives. Homestead Act (1862) Abandoning the land for more than six months at any stretch meant forfeiting the claim entirely. The Homestead Act was not technically adverse possession, since the occupant was claiming government land with permission, but the underlying principle was identical: use the land or lose it.
As the states matured, each wrote its own adverse possession statute with its own time requirement. The national range today runs from as few as 3 years in Texas, with color of title, to 40 years or more in certain situations. Most states cluster between 7 and 20 years. Many eastern states still follow something close to the original English 20-year model, while western states tend toward shorter periods.
Why So Many Systems Arrived at the Same Rule
The through-line from Rome to Westminster to the American frontier is not borrowing but recurrence. Roman lawmakers were not read by medieval English peasants, and English statutes did not dictate what settlers in Ohio or Oregon would need. Each legislature confronted the same underlying problem: records fail, owners vanish, land gets worked by people who were not on the deed, and someone has to resolve the resulting disputes. A deadline on absent owners was the solution that kept emerging because it addressed a condition every property system eventually faces.
That is why asking who invented squatters’ rights produces no single name. The honest answer points to the Roman Twelve Tables for the first codification, the Limitation Act of 1623 for the direct statutory ancestor of American law, and Locke for the moral argument that outlasted the economies that produced it.
The Doctrine Today
Modern adverse possession still carries the Roman and English fingerprints. A squatter typically must occupy the property actually, openly, hostilely, exclusively, and continuously for the statutory period, and in many states must also pay property taxes throughout. A deed that appears to transfer ownership but is legally defective, known as color of title, often shortens the period considerably. One important boundary: government-owned land is generally off-limits. The old English maxim nullum tempus occurrit regi, time does not run against the king, carried into American law, and the Quiet Title Act states that nothing in its provisions “shall be construed to permit suits against the United States based on adverse possession.” No amount of time on a city park or federal forest ripens into a claim.
The Modern Reversal
For most of American history, adverse possession operated quietly in property courts. That changed in the 2020s, when high-profile stories of squatters occupying vacant homes, sometimes with forged leases, prompted a wave of state legislation. By mid-2025, 30 states had considered anti-squatter bills, and at least 13 had enacted new laws. Many create expedited removal procedures that bypass the traditional eviction process. Indiana established an affidavit-based system allowing law enforcement to remove unauthorized occupants within 48 hours. Mississippi created a similar process triggered within 24 hours of filing. Some states have reclassified squatting as a felony, enabling police to arrest occupants on the spot.
These statutes mark the sharpest departure from the doctrine’s original purpose in its 2,500-year history. Where Roman, English, and early American lawmakers designed the rule to reward productive land use and punish neglectful ownership, the recent laws reflect a different priority: protecting owners from occupation they never consented to. Whether the new statutes survive legal challenges, and how they interact with existing adverse possession codes, is a question courts are only beginning to work through.