Simi Valley, CA Noise from Specific Sources: HVAC & Mechanical Noise (2026)

105(I) opens by explaining that the following design guidelines are strongly encouraged for use in the design of mixed-use development applications, and that guideline text appears in italics to distinguish it from standards, which are mandatory requirements. Item 2(l), covering building architecture, nonetheless states plainly that all roof-mounted equipment shall be screened, and directs that special consideration should be given to the location and screening of noise generating equipment such as refrigeration units, air conditioning, and exhaust fans. The Director of Environmental Services can require noise reducing screens and insulation where mechanical equipment like a rooftop condenser or exhaust fan has the potential to impact residential uses housed in the same or an adjacent mixed-use building.

Because the surrounding guideline framework is advisory, the amount of screening, insulation, or setback from a residential unit's window is decided case by case during design review of the applicable Planned Development or Conditional Use Permit for the project, rather than fixed at a single decibel number or distance in the code. 105(D)(12). The owner-occupancy of a JADU is unrelated; this provision is confined to mechanical equipment on buildings within the MU Overlay.