Construction hours in Napa County, CA — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Section 8.16.080 of the Napa County Code prohibits operating construction, drilling, repair, alteration or demolition tools and equipment in a manner that creates a noise disturbance between 7:00 p.m. and 7:00 a.m. in the unincorporated county.
In unincorporated Napa County, construction-related noise is governed primarily by Section 8.16.080 of the Napa County Code, which makes it unlawful to operate any tools or equipment used in construction, drilling, repair, alteration or demolition work between 7:00 p.m. and 7:00 a.m. in a manner that creates a noise disturbance across a residential or commercial property line. Daytime construction is still subject to the exterior noise limits of Section 8.16.070 (with the standard tonal/repetitive sound rule reducing the limit by 5 dB), although construction activity within permitted daytime hours is generally treated as exempt from the numerical standards when conducted with properly muffled equipment. Exceptions exist for emergency work by public service utilities and for activities authorized under a variance from the Noise Control Officer. Individual use permits for wineries, quarries and other discretionary projects often impose tighter construction-hour conditions.
Construction outside 7 a.m.-7 p.m. without a variance is a Napa County Code violation enforceable through code compliance citations and stop-work orders. Repeated violations of permit conditions can result in revocation of the underlying use permit.
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