What can a principal authority delegate to the chief building official?

The correct choice indicates that the principal authority can delegate the authority to decide on necessary agreements to the chief building official. This is grounded in the structure of various regulatory frameworks where specific administrative responsibilities can be assigned to officials to facilitate operational efficiency and ensure compliance with local regulations.

In this case, allowing the chief building official to make decisions regarding agreements can streamline processes related to building permits, inspections, and compliance checks. It enables a more responsive and effective governance structure that ensures vital decisions are made by individuals with relevant expertise and oversight responsibilities.

The other options encompass powers or responsibilities that typically require broader oversight and authority, which may not be delegated. For instance, modifying the building code requires a formal legislative process, while overseeing construction safety generally involves overarching authority that involves various stakeholders and areas of expertise. Similarly, taking legal action against non-compliant builders often demands a level of authority that extends beyond what can be delegated to ensure accountability and adherence to legal standards.