Construction hours in Monterey County, CA — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Monterey County Code Chapter 10.60 sets no fixed daytime construction curfew. Construction equipment is subject to the device limit in Sec. 10.60.030 (any time of day) and to the Sec. 10.60.040 nighttime standards. Construction-hour limits are usually imposed as project Conditions of Approval and on grading permits under County Code Chapter 16.08.
Unlike many city codes, Chapter 10.60 of the Monterey County Code does not list a stand-alone daytime construction-hours window. During the daytime, construction equipment falls under Sec. 10.60.030 (Operation of noise-producing devices restricted), which prohibits operating any machine, mechanism, device, or contrivance producing a noise level above the code's daytime cap measured 50 feet away (historically 85 dBA; reduced by a 2024 amendment). During the nighttime period, construction is constrained by Sec. 10.60.040's 'loud and unreasonable sound' prohibition and the 45 Leq / 65 dBA Table 1 standards. In practice, enforceable construction-hour limits in unincorporated Monterey County come from two places: project-specific Conditions of Approval attached to discretionary permits by HCD Planning, and conditions on grading permits issued under County Code Chapter 16.08 (Grading). Because the County is heavily agricultural, Sec. 10.60.040 also exempts commercial agricultural operations from the nighttime rules. Applicants should confirm the exact allowed hours on their permit's Conditions of Approval.
Construction noise exceeding the Sec. 10.60.030 device limit, or violating the Sec. 10.60.040 nighttime standards, can be cited by HCD code enforcement and the Sheriff. Where a permit imposes specific construction hours, working outside those hours is a permit violation enforced by Code Compliance and can trigger stop-work orders. Misdemeanor charges and the County's escalating fine schedule (up to $250 first offense, up to $1,000 for repeat offenses within 12 months) may apply.
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