What are the causes of building collapse?

The passage of time is one reason. Buildings also collapse due to weak foundations. Earthquakes, hurricanes and other natural disasters can also damage the structure of the buildings and cause it to collapse. Bombings or demolition of buildings is also other reasons.

A few reasons:
1. Design inadequacies
2. Incompetence in engineering practices
3. Counterfeit material
4. Poor workmanship
5. Building settlement
6. Natural calamities