Construction hours in Modesto, CA — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Modesto bans loud construction tools and equipment before 7 a.m. or after 9 p.m. on weekdays, and before 9 a.m. or after 9 p.m. on Saturdays, Sundays, and state/federal holidays.
Modesto Municipal Code § 4-9.103(b) makes it a public nuisance to operate or use specified construction equipment in a loud and raucous manner 'before 7:00 a.m. or after 9:00 p.m. daily (except Saturday and Sunday and State or federal holidays, when the prohibited time shall be before 9:00 a.m. and after 9:00 p.m.).' The list expressly covers hammers and other striking tools, pneumatic impact wrenches and air tools, hand-powered saws, internal-combustion-engine tools (chain saws, backpack blowers, lawn mowers), electrically powered cutting/drilling/shaping tools, heavy equipment (bulldozers, back hoes, road graders), pile-driving equipment, pavement breakers, portable generators, concrete trucks, and 'any construction, demolition, excavation, erection, alteration, or repair activity' (§ 4-9.103(b)(1)–(7)). The Chief Building Official may grant a written emergency exemption of up to three working days, renewable as the emergency continues.
Each operation of restricted equipment outside allowed hours is a public nuisance under § 4-9.102. Contractors, site owners, and supervisors who direct or allow the work are jointly liable under § 4-9.105. Emergency exemptions must be obtained in advance from the Chief Building Official.
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