Construction hours in Ontario, CA — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Ontario limits construction noise under OMC 5-29.09. Allowed hours are 7 AM to 8 PM weekdays and 8 AM to 6 PM Saturday. Sunday and holiday work near residences is restricted absent a waiver.
Ontario Municipal Code Section 5-29.09 regulates construction activity noise separately from general nuisance noise. Allowed hours for residential-area construction, repair, remodeling, demolition, and grading are Monday through Friday 7 AM to 8 PM and Saturdays 8 AM to 6 PM. Sunday and city-observed holiday work in or adjacent to residential zones is generally prohibited absent advance approval. Warehouse and commercial build-outs along the Guasti, Mission Boulevard, and Airport Drive logistics corridors may run longer hours in industrial zones, but equipment must use factory-installed mufflers and contractors are required to use reasonable noise-reduction techniques. Interior-only work that produces no audible external noise is treated more leniently. Emergency utility or public-safety work is exempt. Ontario coordinates construction-noise complaints through Code Enforcement and the Building Department, which can issue stop-work orders for repeat violations.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle construction hours.
See how Ontario's construction hours rules stack up against other locations.
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