Construction hours in Adams County, CO — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Adams County unincorporated sets no separate construction-hours ordinance. Under CRS 25-12-103, construction is held to the industrial-zone noise limits (80 dB(A) day, 75 dB(A) night) for the permitted construction period.
The Colorado Noise Abatement Act gives construction projects the loudest allowance: they are judged against the industrial-zone maximums, not the residential ones, while work proceeds under a valid construction permit or for a reasonable completion period. Daytime activity may also exceed a zone limit by up to 10 dB(A) for a single 15-minute period in any hour. There is no statewide start/stop clock, so unless an incorporated city imposes construction hours, timing is governed by the permit and the decibel caps rather than fixed morning/evening cutoffs.
Construction exceeding the industrial-zone caps outside the permitted period is prima facie evidence of a public nuisance under CRS 25-12-103.
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