Construction hours in Lake County, CA — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Unincorporated Lake County exempts construction-site sounds from its noise standards when they occur between 7:00 a.m. and 7:00 p.m. Under Section 41.11(e)(5) of the County Zoning Code Performance Standards, construction noise within that window is exempt; outside that window construction is subject to the property-line decibel limits and to public-nuisance abatement.
Construction noise in unincorporated Lake County is governed by Section 41.11 of the Zoning Code Performance Standards (Sec. 21-41). Subsection 41.11(e) lists exemptions from the local noise standards, and item (5) exempts 'construction site sounds between 7:00 am and 7:00 pm,' provided standard, reasonable practices are being followed. This effectively establishes a 7:00 a.m. to 7:00 p.m. operating window: construction noise during those hours does not violate the decibel tables, but construction outside that window loses the exemption and must comply with the receiving-property-line limits in Tables 11.1 and 11.2 (for example, 45 dBA at a residential property line at night). A related exemption in 41.11(e)(6) covers lawn and plant care machinery fitted with functioning sound suppression and operated between 7:00 a.m. and 8:00 p.m. The County Code contains no separate weekend or Sunday construction standard, so the 7 a.m.-7 p.m. window applies all week unless a discretionary permit (use permit conditions of approval) imposes tighter limits. These rules apply only in the unincorporated areas; Lakeport and Clearlake have their own municipal codes.
Construction noise outside 7:00 a.m. to 7:00 p.m. that exceeds the Section 41.11 property-line limits, or that constitutes loud or unusual noise under Chapter 13, may be cited. Chapter 13 abatement can lead to infraction or misdemeanor penalties (fine up to $500 or up to six months, per §13-44) and administrative fines of $100/$200/$500 under §13-51. Discretionary projects may have additional construction-hour conditions enforced by Community Development.
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