Adverse possession requires 20 years of continuous unauthorized possession under MGL c. 260, § 21
Adverse possession — sometimes called "squatter's rights" — is a legal doctrine that allows a person who openly and continuously occupies another person's land without permission to eventually obtain legal title. In Massachusetts, under MGL c. 260, § 21, the claimant must maintain possession for at least 20 years to bring a successful adverse possession claim.
To succeed, the occupant must satisfy all five elements: actual physical possession of the property; possession that is open and notorious — visible enough that a reasonable owner inspecting the property would know someone is there; hostile possession — meaning without the owner's permission; exclusive possession — not shared with the owner or the general public; and continuous possession for the full statutory period without substantial interruption.
For landlords, the most important protection is simple: act quickly. As soon as you discover unauthorized occupancy, serve written notice and pursue eviction through the courts. A timely legal action interrupts the adverse possession clock entirely, forcing any future claimant to start the 20-year period over from scratch.
There is an important legal distinction between these two types of unauthorized occupants. A holdover tenant is a former leaseholder — someone who once had a valid lease — who remains in the unit after that lease has expired without the landlord's consent and without executing a new lease. In Massachusetts, holdover tenants are typically treated as month-to-month tenants or as tenants at sufferance depending on whether the landlord continues to accept rent. They must be removed through the formal eviction process with appropriate notice.
A squatter (or trespasser) is someone who entered the property without any prior legal right to do so — they never held a lease with the landlord. Despite having no legal right of occupancy from day one, squatters cannot be physically removed by the landlord without a court order in Massachusetts. Changing the locks, removing belongings, or shutting off utilities to force a squatter out constitutes illegal self-help eviction and can expose the landlord to civil liability.
Under MGL c. 260, § 21, a person must openly, continuously, exclusively, and hostilely possess property in Massachusetts for at least 20 years to make an adverse possession claim. 20 years of adverse possession required.
In most cases police treat squatter removal as a civil — not criminal — matter in Massachusetts. Law enforcement may intervene if there is clear evidence of breaking and entering or other criminal activity. Otherwise, landlords must go through the court eviction process: serve a written notice, file an unlawful detainer action, and obtain a court order. Only a sheriff or marshal can execute the removal after a judgment.
A holdover tenant in Massachusetts is a former leaseholder who continues occupying the unit after their lease expires without the landlord's consent. They had a legal right to be there at one time. A squatter (trespasser) never held a lease and entered the property without permission. Both must be removed through the eviction process — not self-help. The notice period may differ: holdover tenants typically receive a notice to quit equal to the rental period (or 14-day pay-or-quit for unpaid rent), while squatters may be served an immediate written demand to vacate.
The most important step is to act immediately when unauthorized occupancy is discovered. Serve a formal written notice demanding the occupant leave. If they refuse, file for unlawful detainer or ejectment — this legal action interrupts the adverse possession clock. Additionally: post no-trespassing signs, inspect vacant properties regularly, keep records of all communications, and never accept rent or give informal permission to an unauthorized occupant, as that restores permissive use and bars an adverse possession claim.
Adverse possession data sourced from MGL c. 260, § 21. Eviction notice data from U.S. Census Bureau ACS 2023 and M.G.L. c. 186, § 12. Last updated April 29, 2026. This page is for informational purposes only and does not constitute legal advice. Consult a licensed real estate attorney for your specific situation.
