Which structural hazards are emergencies
Serious structural damage — like a ceiling about to collapse, a failing balcony or stairway, or a floor that could give way — is an emergency the landlord must address right away, because it poses an immediate risk of injury.
Not all structural issues are emergencies; a small, stable crack can wait for a normal repair. But anything that could collapse or cause a fall should be treated as urgent, day or night, and many landlords have an emergency-maintenance line for exactly this.
Keep people away from the hazard, report it immediately, and document it. If the danger is severe and the landlord will not respond, your local building or code-enforcement office may also step in. When a structural hazard threatens safety, delay is not acceptable. If your landlord ignores a dangerous structural hazard, a free review can help you understand your options.
This is general information about California tenant rights, not legal advice. Every situation is different.