Quiet Hours: Altadena vs Los Angeles
How do quiet hours rules compare between Altadena, CA and Los Angeles, CA?
Altadena and Los Angeles have similar restriction levels.
Altadena, CA
Los Angeles County
Altadena is unincorporated, so LA County Title 12 Chapter 12.08 (Noise Control) applies. Nighttime exterior limits run 10:00 p.m. to 7:00 a.m. with stricter dB caps; daytime runs 7:00 a.m. to 10:00 p.m.
View full Altadena rules →Los Angeles, CA
Los Angeles County
Los Angeles Municipal Code Chapter XI prohibits unnecessary, excessive noise. Quiet hours run 10 PM–7 AM. Noise must not exceed ambient levels by more than 5 dBA on adjacent residential properties.
View full Los Angeles rules →Key Facts Comparison
| Fact | Altadena | Los Angeles |
|---|---|---|
| Code Section | LA County Code Ch. 12.08 (Title 12) | - |
| Nighttime Window | 10:00 p.m. – 7:00 a.m. | - |
| Residential Night Limit | 45 dBA (R-1) | - |
| Residential Day Limit | 50 dBA (R-1) | - |
| Ambient Exceedance Rule | +5 dB over ambient | - |
| Code | - | LAMC Chapter XI, §§41.57, 112.04–112.05 |
| Quiet Hours | - | 10 PM–7 AM |
| dBA Limit | - | Not to exceed ambient +5 dBA |
| Equipment | - | 75 dB max; gas blowers banned within 500 ft of residence |
| Enforcement | - | LAPD non-emergency: (877) 275-5273 |
Highlighted rows indicate differences between cities.
Altadena FAQ
What are Altadena's quiet hours?
10 p.m. to 7 a.m. under LA County Code Ch. 12.08 — Altadena is unincorporated so LA County's noise ordinance applies.
How loud can my backyard be at night?
Single-family residential exterior noise is capped at 45 dBA from 10 p.m. to 7 a.m. per Section 12.08.390.
Los Angeles FAQ
What are the quiet hours in los Angeles?
Los Angeles Municipal Code Chapter XI prohibits unnecessary, excessive noise. Quiet hours run 10 PM–7 AM. Noise must not exceed ambient levels by more than 5 dBA on adjacent residential properties.
What happens if I violate the noise ordinance in los Angeles?
Code: LAMC Chapter XI, §§41.57, 112.04–112.05. Quiet Hours: 10 PM–7 AM. dBA Limit: Not to exceed ambient +5 dBA. Equipment: 75 dB max; gas blowers banned within 500 ft of residence.
Compare other topics
See how Altadena and Los Angeles compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool