In what circumstances is a building permit required?

A building permit is required for a wide range of activities, including new construction, alterations, repairs, and demolition work. This requirement exists to ensure that all construction meets established safety, health, and structural standards outlined in the building code. The permit system helps regulate construction practices and ensures that the work complies with zoning laws, accessibility standards, and environmental requirements.

Permitting requirements cover not only the initiation of new buildings but also encompass any modifications, significant repairs, or demolitions of existing structures. This broad scope is crucial for maintaining the integrity and safety of the built environment. Activities like major renovations or repairs typically involve structural changes or impact safety features, thus needing oversight and approval through the permit system.

Limiting permits to only new constructions or specific types of properties overlooks the importance of regulating all construction-related activities that can affect public safety and compliance with local ordinances. Additionally, some jurisdictions may impose thresholds based on project costs, but these rules do not change the fundamental requirement for a permit across various types of work. Therefore, the comprehensive approach outlined in the correct answer reflects the necessity of permits in residential code enforcement.