Trespassing vs. Unlawful Detainer: Which Legal Action to Use

Should you call the police or file a civil lawsuit? The answer depends on how the person entered your property, how long they’ve been there, and what they claim. This guide explains both remedies and when to use each.

When a property owner discovers an unauthorized person on their property, two distinct legal frameworks come into play: criminal trespass (a crime enforced by law enforcement) and civil unlawful detainer (a lawsuit filed by the property owner in court). These are not interchangeable remedies — they serve different purposes, involve different procedures, and have different results. Understanding which one applies (and when to pursue both) is essential to removing the unauthorized person as efficiently as possible.

Table of Contents

1. Criminal Trespass: The Police Route
2. Civil Unlawful Detainer: The Court Route
3. Side-by-Side Comparison
4. When the Police Can Remove the Person
5. When You Need a Civil Action
6. Using Both Remedies Simultaneously
7. The Trespass After Warning Strategy
8. Frequently Asked Questions

1. Criminal Trespass: The Police Route

Criminal trespass in Florida is governed by Section 810.08, Florida Statutes(trespass in a structure or conveyance) and Section 810.09(trespass on property other than a structure or conveyance). Under Section 810.08, a person who willfully enters or remains in a structure (which includes a dwelling) after having been warned not to enter or remain, or after having been directed to leave, commits the crime of trespass in a structure, which is a first-degree misdemeanor punishable by up to one year in jail and a $1,000 fine.

The elements of criminal trespass are straightforward: the person entered or remained in the structure; the entry or remaining was willful (not accidental); and the person was warned not to enter or was told to leave. The “warning” element is critical. A person cannot be arrested for trespass unless they have been told — by the property owner, an authorized agent, or a law enforcement officer — that they are not welcome and must leave.

What Criminal Trespass Does and Does Not Do

Criminal trespass is designed to punish the trespasser through criminal sanctions (arrest, jail, fines). It is not designed to restore possession to the property owner. When the police arrest a trespasser, the trespasser is removed from the property as an incident of the arrest — but the arrest itself does not give the property owner a court order for possession. If the trespasser returns after being released, the property owner must call the police again or pursue a civil remedy.

Criminal trespass is most effective as an immediate response to an intruder who is caught on the property and has no claim to being there. It is least effective when the unauthorized person has established some form of occupancy — moved in belongings, been living there for days or weeks, receives mail at the address — because at that point, the police are likely to treat the situation as a “civil matter” and decline to make an arrest.

2. Civil Unlawful Detainer: The Court Route

Civil unlawful detainer under Chapter 82 of the Florida Statutes is designed to restore possession

of the property to its rightful owner through a court order. Unlike criminal trespass, which is initiated by law enforcement, the unlawful detainer action is initiated by the property owner, filed in civil court, and results in a final judgment and writ of possession that the sheriff enforces.

Unlawful detainer is the appropriate remedy when the unauthorized person has established occupancy— meaning they are not merely present on the property for a brief moment but have settled in and are treating the property as their residence. The full process is described in detail in the unlawful detainer pillar guide.

3. Side-by-Side Comparison

4. When the Police Can Remove the Person

Law enforcement is most likely to act — and act quickly — in the following situations.

The person was just discovered and has not established occupancy. If you find someone inside your property who clearly just broke in — the lock is damaged, the window is smashed, they have minimal belongings — and the person cannot produce any document claiming a right to be there, the police will typically arrest the person for burglary or criminal trespass.

You have already issued a trespass warning. If you previously told the person (verbally, in writing, or through law enforcement) that they are not permitted on the property, and the person returns or remains after the warning, the police can arrest for trespass. A formal “trespass warning” issued by a law enforcement officer carries particular weight because it creates an official record.

The person is committing a crime in your presence. If the unauthorized person is engaged in criminal activity on the property — drug activity, assault, destruction of property, theft — the police can arrest for the underlying crime, and the person is removed incident to that arrest.

You have a court order. If you have already obtained a final judgment for possession and a writ of possession through the unlawful detainer or eviction process, the sheriff will enforce the writ and remove the person. A domestic violence injunction ordering the person to vacate the residence is similarly enforceable by law enforcement.

5. When You Need a Civil Action

You will need to file a civil unlawful detainer action (or eviction, depending on the relationship) when the police treat the situation as a “civil matter” — which happens in the following circumstances.

The person claims to live there. If the unauthorized person tells the responding officer that they “live here,” have been staying here for weeks or months, have belongings in the property, or receive mail at the address, the officer will almost certainly decline to make an arrest and will tell you to get a court order. From the officer’s perspective, they are unable to determine on the spot whether the person has a right to be there, and arresting someone who turns out to have a colorable claim to occupancy exposes the officer and the department to liability.

The person produces a document. If the person shows the officer a piece of paper that purports to be a lease, a rental agreement, a deed, or any other document claiming a right to the property — even an obviously fabricated one — the officer will typically decline to adjudicate the competing claims and will direct you to the courts. Under the 2024 anti-squatter law (Section 82.045), the expedited sheriff affidavit process may bypass this limitation in clear-cut cases, but when the situation is ambiguous, the court route is necessary.

The person is a former guest, family member, or acquaintance. When there is any prior relationship between the property owner and the occupant — even if the person was never a tenant — the police will generally view the situation as a domestic or civil dispute and will not intervene to remove the person.

The “Civil Matter” Frustration

The phrase “it’s a civil matter” is the most frustrating thing a property owner can hear from a responding officer. It means the police will not act, and you must pursue the court process on your own. While this feels unjust — particularly when the person is clearly an intruder with no legitimate right to your property — the officers are following a reasonable protocol: they cannot determine who has the right to a property on the spot, and wrongfully arresting someone who has a legal right to be there creates enormous liability. The court process, while slower, resolves the legal question definitively.

6. Using Both Remedies Simultaneously

Criminal trespass and civil unlawful detainer are not mutually exclusive. In many cases, the most effective strategy is to pursue both simultaneously.

Step 1: File a police report. Even if the police decline to arrest the person, filing a police report creates an official record that you are the property owner, you reported an unauthorized person on your property, and you requested the person’s removal. This report can be attached to the unlawful detainer complaint as evidence and establishes a timeline that supports your case.

Step 2: Request a formal trespass warning. Ask the responding officer to issue a formal trespass warning to the unauthorized person. This puts the person on official notice that they are not authorized to be on the property and that any further presence constitutes criminal trespass. If the person remains after the warning, the police may be more willing to arrest on a subsequent call.

Step 3: File the unlawful detainer action. Simultaneously, retain an attorney and file the civil unlawful detainer complaint. The civil action ensures that even if the criminal process stalls (which it often does), you have a parallel path to a court order for possession.

Step 4: Attempt the expedited sheriff process. If the situation qualifies under Section 82.045 (the person is a squatter with no colorable claim), file the affidavit with the sheriff for expedited removal while the civil case is pending. If the sheriff acts, the situation is resolved in days. If the sheriff declines, the civil case continues to judgment.

Document Everything for Both Proceedings

Photographs of the property showing signs of unauthorized entry, police report numbers and officer names, copies of the trespass warning, the written demand to vacate and proof of delivery, and any communications with the unauthorized person are all useful in both the criminal and civil proceedings. Build your documentation from day one.

7. The Trespass After Warning Strategy

One particularly effective approach combines criminal and civil remedies. The property owner (or a law enforcement officer) issues a formal trespass warning to the unauthorized person, stating that they are not authorized to be on the property and must leave immediately. If the person leaves, the problem is solved. If the person remains or returns after the warning, they have committed criminal trespass (Section 810.08), and the police can arrest them. The trespass warning also serves as the “demand to depart” required under Section 82.01 for the civil unlawful detainer action.

This approach works best in situations where the unauthorized person has not yet firmly established occupancy — they have been there for a short time, have minimal belongings, and have not taken actions (like setting up utility accounts or receiving mail) that would make law enforcement hesitant to act. The earlier you issue the trespass warning, the more effective it is.

How to Issue a Trespass Warning

The most effective trespass warning is one issued by a law enforcement officer during a police response. When the officer responds to your call, ask them to issue a written trespass warning to the unauthorized person. Many Florida law enforcement agencies have a standard form for this purpose. The warning is documented in the police report and creates an official record.

If the police are unwilling to issue a formal warning (which can happen when they characterize the situation as a civil matter), the property owner can issue the warning directly. The warning should be in writing, state that the person is not authorized to be on the property, demand that the person leave immediately, state that any further presence constitutes criminal trespass under Section 810.08, and be delivered in the presence of a witness or documented by photograph (showing the warning posted on the property).

Not Sure Which Legal Action to Pursue?

We analyze your situation, coordinate with law enforcement when appropriate, and file the correct civil action to get you possession — fast.

8. Frequently Asked Questions

Related Guides

• ← Back to: Remove Squatters in Florida — Unlawful Detainer (Pillar Guide)
• Emergency Squatter Removal: Expedited Unlawful Detainer
• Can a Landlord Change Locks in Florida?
• Florida Ejectment Lawyer (for title disputes)
• Florida Residential Eviction Attorney (for tenant situations)