Two sources of quiet hours
"Quiet hours" are set times — often overnight and sometimes on Sundays or holidays — when loud noise is restricted. They can come from two places: your local city or county noise ordinance, and your building's own rules or lease.
Many California cities have noise ordinances that limit excessive or disturbing noise, often with stricter limits during nighttime hours. These local rules apply to everyone in the area, and serious violations can sometimes bring a police or code-enforcement response.
Separately, many apartment communities set their own quiet hours in the lease or house rules. Because these are part of the rental agreement, the landlord can generally enforce them against tenants who break them.
So if noise is disturbing you during quiet hours, you may have two tools: the local ordinance and the lease rules. Documenting the time and nature of the noise helps with both.
If a neighbor who is another of the landlord's tenants repeatedly violates quiet hours and the landlord will not enforce the rules, a free, confidential review can help you understand your options.
This is general information about California tenant rights, not legal advice. Every situation is different.