Which types of structures does the IRC apply to?

The International Residential Code (IRC) is specifically designed to ensure the safety and effectiveness of residential construction. It applies to various types of structures that house occupants and focuses primarily on the construction of single-family homes, two-family homes (duplexes), and townhouses. The IRC typically covers residential buildings up to three stories in height.

This framework is established to provide guidelines related to building safety, structural integrity, and overall living conditions for residences, which is vulnerable in multi-family units and homes that reach a certain height. The emphasis is on maintaining consistent construction standards and ensuring the safety of residents in these types of dwellings.

The other choices fall outside the scope of the IRC—commercial buildings and structures exceeding three stories are governed by different codes and regulations that are suited for their more complex needs and higher potential risks associated with their occupancy and use.