Construction hours in Jefferson County, CO — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Construction in residential zones may reach 80 dB(A) from 7:00 a.m. to 7:00 p.m. and 75 dB(A) from 7:00 p.m. to 7:00 a.m., for the period allowed by the construction permit or a reasonable completion time.
Jefferson County's Noise Abatement Policy grants construction projects higher permissible noise levels than ordinary residential activity. During the permit period (or a reasonable time to finish if no limit is set), a construction site may produce up to 80 dB(A) daytime and 75 dB(A) at night, matching Colorado's industrial-zone caps under CRS 25-12-103(5). This is a noise ceiling, not a schedule; the county policy does not itself impose fixed start/stop clock hours, so incorporated cities may impose stricter construction curfews.
Exceeding the construction noise ceiling is a Class 2 Petty Offense; $30 fine per offense escalating to a $300 maximum, plus court costs.
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See how Jefferson County's construction hours rules stack up against other locations.
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