Building codes vary from state to state and between jurisdictions. While Northern states are more focused on energy conservation, California on earthquakes, Southeastern states include more measures addressing hurricanes.

Some states may limit or strike out new requirements they view as too costly, unnecessary, or otherwise inappropriate for their constituents. Others may see value in the updates, sealing them into law or even strengthening them to protect their community. 

Model codes (I-Codes) are baseline requirements. They vary widely from jurisdiction to jurisdiction and change frequently from time to time. Local codes take precedence over all model building codes, and may or may not have adopted any particular model code or may have adopted it only in part.