Noise from Specific Sources in Simi Valley, CA

Simi Valley maintains 136 local ordinances across all categories, and 3 of those deal specifically with noise from specific sources. Here is a breakdown of what the city actually requires, what is prohibited, and where Simi Valley falls on the strict-to-permissive spectrum compared to other cities.

Bar & Nightclub Noise

Simi Valley treats loud amplified sound and live music near homes as a public nuisance. Venues near residential neighbors must stop amplified music by 11:00 p.m. on weekends and 10:00 p.m. on weeknights, and any live band or orchestral rehearsal within 200 feet of an occupied residence faces the same nighttime cutoff.

Key details: Weekend cutoff: 11:00 p.m. Fri/Sat. Weeknight cutoff: 10:00 p.m. Sun-Thu. Live music buffer: 200 ft from occupied residence. Classification: Misdemeanor, per day continued. Repeat offense: Warning ignored = willful intent.

Any of the acts in Section 5-16.02, including amplified music, live band rehearsals within 200 feet of a residence, or crowd noise outside a venue during the nighttime hours, is a public nuisance and a misdemeanor for each day it continues. Continuing after a peace officer's warning is treated as evidence of willful intent, supporting enhanced enforcement against repeat violators.

Generator Noise

Simi Valley Municipal Code Section 5-16.02(d) bars running a portable generator, motor or engine outdoors between 11 p.m. and 7 a.m. on weekends and 10 p.m. and 7 a.m. on weeknights unless it sits inside a sound-insulated enclosure quiet enough that it can't be heard 50 feet away, or is more than 10 feet from a residence.

Key details: Weeknight curfew: 10:00 p.m.-7:00 a.m., Sunday-Thursday. Weekend curfew: 11:00 p.m.-7:00 a.m., Friday-Saturday. Audibility threshold: Not plainly audible 50 feet from enclosure. Residence buffer: 10 feet minimum without sound insulation. Public roadway vehicles: Excluded from this subsection.

Anyone maintaining or permitting a nuisance under Section 5-16.02, including running a generator or engine past the curfew without adequate sound insulation, shall be deemed guilty of a misdemeanor for each day during which such nuisance is maintained or permitted to exist, per the section's opening language, meaning repeated nights of violation can be charged separately rather than as one continuing offense.

HVAC & Mechanical Noise

In Simi Valley's Mixed-Use Overlay District, SVMC Section 9-44.105(I)(2)(l) requires all roof-mounted equipment to be screened and calls for special attention to noise-generating units like refrigeration equipment, air conditioners, and exhaust fans. The rule sits within the chapter's design guidelines, so most of its detail is strongly encouraged rather than mandatory, but the screening requirement itself is written as a shall.

Key details: Roof equipment: Must be screened (SVMC 9-44.105(I)(2)(l)). Named noise sources: Refrigeration units, air conditioning, exhaust fans. Rule type: Design guideline, not a fixed numeric standard. Extra mitigation: Noise reducing screens/insulation may be required. Applies to: Mixed-Use Overlay District projects only.

Because Section 9-44.105(I) is framed as design guidance rather than a fixed numeric standard, the City addresses HVAC noise complaints for mixed-use projects through the discretionary review process: staff or the Planning Commission can condition project approval on added screening or insulation, and a completed project found to generate excessive equipment noise toward residential units can be required to retrofit screening before receiving final approval.

The rules around hvac & mechanical noise in Simi Valley lean permissive, but that does not mean anything goes.

The Bottom Line

Simi Valley's noise from specific sources rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Simi Valley is broadly strict or permissive.

This guide is based on Simi Valley's current municipal code. Local rules can and do change, so check the individual ordinance pages for the latest details, penalties, and FAQs.