What crime is committed if a person enters a structure without permission and intends to commit a crime inside?

The situation described involves a person who unlawfully enters a structure with the intent to commit a crime once inside. This behavior falls under the definition of burglary. Burglary specifically requires two elements: unauthorized entry into a structure and the intention to commit a crime inside. The focus on intent is critical; simply entering without permission does not constitute burglary unless there is a planned criminal act.

In contrast, criminal trespass involves entering a property without permission but does not necessarily include the intent to commit an additional crime once inside. Terrorizing involves actions that instill fear in another person, not the act of breaking and entering. Criminal mischief pertains to damaging property, which is unrelated to the act of unauthorized entry with intent to commit an offense. Therefore, burglary is the accurate classification of the crime described in the question.