Burglary in the First Degree Under RSMo: 85% Rule and Defenses

Burglary in the first degree under Missouri Revised Statutes Section 569.160 is a Class B felony punishable by five to fifteen years in prison, and because the law classifies it as a “dangerous felony,” anyone convicted must serve at least 85% of the sentence before becoming eligible for release.¹² It is the most serious burglary charge in the state, reserved for break-ins that involve a weapon, violence, or an occupied structure.

What Makes a Burglary “First Degree” in Missouri

Standard burglary becomes first-degree burglary when at least one of three aggravating circumstances is present during entry, while the person is inside the structure, or during immediate flight from it.³ Any one of them is enough.

The first aggravator is being armed with explosives or a deadly weapon. Missouri defines a deadly weapon as any firearm (loaded or unloaded), any weapon capable of firing a shot that could cause death or serious physical injury, or specific items including a switchblade knife, dagger, billy club, blackjack, or metal knuckles.⁴ The weapon does not have to be used or even displayed. An unloaded pistol tucked into a waistband during the break-in satisfies this element.

The second is causing or threatening physical injury to someone who is not a participant in the crime. Missouri defines physical injury as physical pain, illness, or any impairment of physical condition, which is a low bar. Shoving a homeowner aside while fleeing can be enough.⁴

The third is that a non-participant is present in the structure. If anyone other than an accomplice is inside at the time of entry or while the person remains, the charge rises to first degree, and this is true even if the occupant never notices the break-in. A sleeping resident in a back bedroom counts. This factor is the one that most often applies in residential cases.³

The statute extends each of these factors to accomplices. If one participant carries a weapon, everyone involved can face first-degree liability, including a lookout who never set foot inside the building.

What the Prosecution Must Prove

Beyond the aggravating factor, the state has to establish the three baseline elements of burglary: unauthorized entry (or remaining after permission expired), entry into a building or inhabitable structure, and intent to commit a crime once inside.³

The “knowingly” piece matters. Prosecutors must show you knew your entry or continued presence was unauthorized. Walking into an unlocked office you believed you had permission to enter is a different legal situation than forcing a window at 2 a.m.

Intent is what separates burglary from trespassing. The state must prove you entered or stayed with the purpose of committing a crime inside, whether that crime is theft, assault, vandalism, or anything else. That intent has to exist at the time of entry or while you remain unlawfully. Someone who enters for an innocent reason and only forms criminal intent later presents a weaker case for the prosecution. Evidence of intent is often circumstantial: carrying burglary tools, heading straight for a cash register, or fleeing with stolen property.

What Counts as a Building or Inhabitable Structure

The statute applies to both buildings and inhabitable structures, and Missouri defines that second term broadly. Under Section 556.061, an inhabitable structure includes any vehicle, vessel, or structure where someone lives, works, or conducts business. It also covers places where people gather for education, government, religion, entertainment, or public transportation, and anything used for overnight accommodation.⁴ A houseboat, a lived-in travel trailer, or a church all qualify.

The structure does not have to be occupied at the moment of entry. A vacation home sitting empty for months is still an inhabitable structure because it is capable of being used for overnight stays. In a building divided into separate units, any unit you do not occupy counts as the inhabitable structure of another person, so breaking into a neighbor’s apartment in your own building still qualifies.

Prison Time and the 85 Percent Rule

A Class B felony in Missouri carries an authorized term of five to fifteen years.¹ Where a judge lands within that range depends on the aggravating circumstances, criminal history, and the specific facts of what happened inside the structure.

The harsher reality is parole eligibility. First-degree burglary is a “dangerous felony” under Section 556.061, and that designation triggers Section 558.019, which requires anyone convicted of a dangerous felony to serve at least 85% of the court-imposed sentence before release.² The only exception releases a person who reaches age 70 and has served at least 40% of the sentence. On a ten-year sentence, the 85% rule means a minimum of eight and a half years in prison before parole is even considered.

That is a sharp break from how non-violent Class B felonies are treated. A typical non-dangerous Class B offender may be eligible for parole after serving 25% of the sentence. For first-degree burglary, early release is largely theoretical.

Enhanced Sentences for Prior Convictions

Missouri’s persistent offender rules can push the exposure much higher. Under Section 558.016, a person qualifies as a “persistent offender” with two or more prior felony convictions from separate incidents, or with a single prior dangerous felony conviction.⁵ A persistent offender convicted of a Class B felony is sentenced at the next class up. Class A carries ten to thirty years or life imprisonment.¹

A separate “dangerous offender” designation applies when someone commits a felony that knowingly endangers, threatens, or inflicts serious physical injury on another person and has a prior Class A or B felony or prior dangerous felony conviction.⁵ The same one-class bump applies. Realistic exposure for a first-degree burglary defendant with a serious record can reach thirty years to life.

Consequences That Outlast the Sentence

A Class B felony conviction follows you after release in ways that are often more disruptive than the prison term itself.

Under 18 U.S.C. § 922(g), anyone convicted of a crime punishable by more than one year of imprisonment is permanently prohibited from possessing firearms or ammunition. First-degree burglary easily clears that threshold, and the ban is nationwide and does not expire when the sentence ends.⁶
Employment screening often disqualifies applicants with violent property crime convictions from positions in healthcare, education, law enforcement, finance, and many licensed professions.
Landlords and public housing authorities frequently screen for felony convictions, and a charge that signals both property crime and violence is particularly difficult to overcome.
For non-citizens, a burglary conviction frequently qualifies as a crime involving moral turpitude, which can trigger deportation or make a person inadmissible for future visas or green cards.

Missouri allows some felony convictions to be expunged under certain conditions, but dangerous felonies face additional restrictions and longer waiting periods. Clearing a first-degree burglary record is a challenging process.

How First Degree Compares to Second Degree

Second-degree burglary under Section 569.170 covers the same baseline conduct of unlawful entry with criminal intent, but without any of the three aggravating factors.⁷ It applies when the structure is unoccupied, no one is armed, and no one is hurt or threatened. The standard offense is a Class D felony with a maximum of seven years, bumping up to a Class C felony (up to ten years) when the target is a motor vehicle and the person possesses or steals a firearm.¹ The sentencing gap is significant: five to fifteen years for first degree against up to seven for standard second degree. Removing the aggravating factor is often the central objective for defense counsel.

Defenses That Commonly Apply

Defense strategies target one of the required elements. Knocking out any single element defeats the charge, and knocking out the aggravator reduces it to second degree.

Lack of criminal intent is the most common angle. If the facts show lawful purpose or a genuine mistake, the state cannot prove intent to commit a crime inside. Entering the wrong apartment in a confusing building is categorically different from prying open a window at midnight.
Authorization to enter defeats the “unlawfully” element. A guest invited earlier in the day who returns that evening has a colorable argument even if the host now says the invitation had expired.
Challenging the aggravating factor itself can drop the case to second degree. That might mean disputing whether a particular item qualifies as a deadly weapon, or whether anyone was actually present when the entry occurred.
Disputing identity matters most when there was no direct confrontation. In after-the-fact break-ins, the state relies on forensic evidence, surveillance footage, or witness identification, and weaknesses in any of that can create reasonable doubt.

How Long the State Has to File Charges

Under Section 556.036, Missouri generally has three years from the date of the offense to file felony charges.⁸ First-degree burglary falls within that standard window. The clock can be paused in certain circumstances, including when the defendant is absent from the state. If you know an investigation is open, do not assume the deadline has passed without checking with an attorney who can confirm whether any tolling applies.

1
Missouri Revisor of Statutes. Missouri Code 558.011 – Authorized Terms of Imprisonment
2
Missouri Revisor of Statutes. Missouri Code 558.019 – Minimum Prison Terms, Dangerous Felonies
3
Missouri Revisor of Statutes. Missouri Code 569.160 – Burglary in the First Degree, Penalty
4
Missouri Revisor of Statutes. Missouri Code 556.061 – Code Definitions
5
Missouri Revisor of Statutes. Missouri Code 558.016 – Persistent Offender, Dangerous Offender
6
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts
7
Missouri Revisor of Statutes. Missouri Code 569.170 – Burglary in the Second Degree
8
Missouri Revisor of Statutes. Missouri Code 556.036 – Time Limitations