In criminal law, the legal definition of an occupied structure is any building, vehicle, or place adapted for overnight accommodation or for carrying on business, whether or not a person is actually inside at the time of the crime. The label matters because it is the trigger that lifts a break-in from a low-level property offense to a felony, and lifts a trespass from a violation to a jailable misdemeanor.
What “Occupied” Actually Means
The Model Penal Code supplies the template most states follow. Section 221.0(1) defines an “occupied structure” as any structure, vehicle, or place adapted for overnight accommodation of persons, or for carrying on business, whether or not a person is actually present. Two elements control: the space must be set up for people to sleep or work in, and no one has to be inside when the crime happens.
That second element is where ordinary English misleads people. “Occupied” sounds like someone is there. Legally, it means the space is maintained for human use. A locked office at 2 a.m. on a Saturday is still an occupied structure. A family’s home during a two-week vacation is still an occupied structure. The question is whether the place is adapted and maintained for people, not whether anyone happens to be inside when a break-in occurs.
Which Spaces Qualify
The definition reaches well beyond traditional buildings. Tents, boats, trailers, and other non-permanent shelters all qualify when they are set up for someone to sleep in or run a business from. A houseboat moored at a dock, a tent at a campground, and a trailer on a construction site can carry the same protection as a brick house.
Motor vehicles designed for habitation fall into the category too. An RV with sleeping quarters and a kitchen qualifies. A van converted into a living space with a bed and basic amenities qualifies. A standard sedan used only for transportation generally does not, because it lacks the adaptations that make it suitable for overnight accommodation. The dividing line is whether the vehicle, as designed or modified, could reasonably house someone — not whether anyone is actively living in it.
Retail stores, restaurants, offices, and warehouses count because they are adapted for carrying on business, and that remains true when the business is closed. A restaurant locked up after the dinner rush is still an occupied structure because it is actively maintained for daily commercial use. Stocked inventory, functioning utilities, and regular employee access all show the space qualifies.
Separately Secured Portions
The MPC and most state statutes extend the concept to any “separately secured or occupied portion” of a building. In practice, that means an individual apartment within a complex, a single office suite inside a shared building, or a locked storage room inside a warehouse each counts as its own occupied structure. A defendant who forces entry into one locked unit cannot defeat the charge by arguing they were already inside the larger building. Each independently secured area is treated as a distinct space with its own expectation of privacy and safety.
When a Structure Loses Its Occupied Status
A temporarily empty structure is still occupied. A truly abandoned one is not, and the difference carries real legal weight. A seasonal cabin that sits empty all winter remains an occupied structure as long as the owner maintains it and intends to return. Active utility accounts, personal belongings inside, routine maintenance, and intact locks all signal that the space is still adapted for human use. Courts look at the owner’s intent and the property’s functional condition, not how many days have passed since someone was last inside.
Abandonment is the opposite picture. When an owner has clearly given up on a property and stopped maintaining it, courts may find it no longer qualifies as occupied. There is no single national standard, but recurring factors include prolonged vacancy, visible disrepair such as boarded windows or structural damage, delinquent property taxes, and the owner’s demonstrated intent to relinquish the property. Accumulated trash, graffiti, and disconnected utilities reinforce the finding.
The classification matters because the MPC provides an affirmative defense to burglary when the building or structure was abandoned.1Digital Commons @ American University Washington College of Law. Deconstructing Burglary A defendant who enters a building they reasonably believe is abandoned may defeat a burglary charge entirely, though trespass charges can remain. The prosecution has to prove the structure was maintained for human use, so abandonment evidence often becomes a central issue at trial.
How the Classification Changes Burglary Penalties
Under the MPC’s grading system, burglary of an occupied structure starts as a third-degree felony. It escalates to a second-degree felony under specific aggravating circumstances: the crime occurred in a dwelling at night, the defendant inflicted or attempted to inflict bodily injury, or the defendant was armed with a deadly weapon or explosives.2Houston Law Review. That’s Not a Burglary! Classic Crimes and Current Codes Entry into an occupied structure does not automatically produce a second-degree felony; the elevated grade is reserved for situations where the danger to people is greatest.
The sentencing gap is significant. Under the MPC framework, a second-degree felony carries a maximum prison term of ten years and a fine of up to $10,000. A third-degree felony carries a maximum of five years and a fine of up to $5,000. States that adopted the MPC’s structure have adjusted these ranges, but the pattern holds: burglarizing an occupied structure where someone is sleeping at night, or where the intruder is armed, draws substantially more prison time than entering a closed but empty business after hours.
Some states have added their own layer. A jurisdiction that treats “person present” as a separate aggravating factor can push an MPC third-degree burglary into higher penalty territory when the break-in directly endangers someone inside.
How It Changes Trespass Penalties
Criminal trespass involving an occupied structure is less serious than burglary because it lacks the intent to commit a crime inside, but it still carries steeper penalties than wandering onto open land. Under MPC Section 221.2, entering a building or occupied structure without permission is a petty misdemeanor in most circumstances. If the trespass occurs in a dwelling at night, the grade rises to a misdemeanor. Trespass does not reach felony level under the MPC itself, though some states have enacted enhancements that push certain trespass offenses higher.
Trespass law generally requires that the defendant knew, or should have known, they were not welcome. Oral or written communication from the owner is the clearest form of notice. Fencing or enclosures designed to keep people out qualify. Posted signs at entrances or along boundaries satisfy the notice requirement when they are reasonably likely to catch an intruder’s attention. For an occupied structure, locked doors and security systems serve as implicit notice, which makes it harder to claim ignorance.
A more serious form of trespass occurs when someone defies a direct order to leave. Under the MPC, a person told personally by the owner to leave who refuses commits a petty misdemeanor, while the same conduct without a direct personal communication may only be a violation.3eCFR. 25 CFR 11.411 – Criminal Trespass
Defenses That Attack the Occupied-Structure Element
The MPC builds three defenses directly into its burglary statute, each one aimed at a core element of the charge.
- Abandoned structure. If the building was abandoned at the time of entry, the defendant has an affirmative defense to burglary and typically needs objective proof: prolonged vacancy, disrepair, and apparent intent by the owner to give up the property.
- Open to the public. If the premises were open to the public when the defendant entered, the entry itself is lawful. Someone who walks into a store during business hours has not committed burglary by entering, even if they intend to shoplift. A charge in that situation has to rest on “unlawful remaining,” which generally requires evidence that the person entered a restricted area or stayed after being told to leave.1Digital Commons @ American University Washington College of Law. Deconstructing Burglary
- Licensed or privileged to enter. If the defendant had actual permission to be inside, no burglary occurred through entry alone. The defense covers invited guests, employees, contractors, and anyone else with a legitimate reason to be on the premises.
The “open to the public” defense has limits that catch defendants off guard. Walking into an open store does not authorize entry into the back office, the stockroom, or any area marked for employees only. Crossing into a restricted portion of the building can convert a lawful entry into an unlawful one, and the burglary statute then applies in full. A store closed for the night is no longer open to the public, which eliminates the defense entirely.
A Note on Curtilage
Curtilage, the area immediately surrounding a dwelling, is a separate concept and does not automatically make outbuildings occupied structures. A detached shed, freestanding garage, or outbuilding may fall within the curtilage for Fourth Amendment search-and-seizure purposes without meeting the occupied-structure test for burglary grading.4Legal Information Institute. Curtilage Whether a detached structure counts depends on whether it independently satisfies the “adapted for overnight accommodation or business” standard. A detached garage used only for parking cars usually does not. A detached guest house with a bed and bathroom usually does.