Construction hours in Cupertino, CA — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
CMC Section 10.48.053 permits grading, construction, and demolition only during daytime hours: 7:00 a.m. to 8:00 p.m. on weekdays and 9:00 a.m. to 6:00 p.m. on weekends and holidays, with mufflers required and hard caps on equipment noise.
Cupertino Municipal Code Section 10.48.053 allows grading, construction, and demolition to exceed the Section 10.48.040 limits only during daytime hours, and only if equipment has high-quality mufflers in good condition and either no single device exceeds 87 dBA at 25 feet or the noise on any nearby property stays under 80 dBA. It is a violation to do grading, street construction, demolition, or underground utility work within 750 feet of a residential area on Saturdays, Sundays, holidays, or nighttime. Construction other than street construction is prohibited on holidays and nighttime. Construction helicopters are limited to 9:00 a.m.-6:30 p.m. Monday through Friday. Homeowners using domestic tools have a limited exception under CMC 10.48.029.
Violating construction-hour or noise limits under Chapter 10.48 is a misdemeanor punishable per CMC Chapter 1.12 (CMC 10.48.070). Code Enforcement issues a courtesy notice, then a citation for continued or repeat violations.
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