Jefferson County, CO Noise Ordinances: Construction Hours (2026)
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.
Key Facts
- Daytime construction limit
- 80 dB(A), 7 a.m.-7 p.m.
- Nighttime construction limit
- 75 dB(A), 7 p.m.-7 a.m.
- Limit tied to
- Active construction permit period
- Measurement distance
- 25 feet from property line
- First-offense fine
- $30.00, up to $300.00
Summary
Jefferson County doesn't set a construction curfew by clock time; instead it caps construction-site noise in residential zones at 80 dB(A) from 7 a.m. to 7 p.m. and 75 dB(A) overnight for as long as the building permit runs, under the county's Noise Abatement Policy.
D.5. Construction projects in residential zones shall be subject to the following permissible noise levels for the period within which construction is to be completed pursuant to any applicable construction permit issued by proper authority, or if no time limitation is imposed, then for a reasonable period of time for completion of project. 7:00 A.M. until 7:00 P.M.: 80 dB(A). 7:00 P.M. until 7:00 A.M. of the same day of the following day: 75 dB(A). F.1. Any person who violates any of the provisions of this Regulation commits a Class 2 Petty Offense. F.2. All persons who acknowledge guilt or are found guilty shall be punishable by a fine of $30.00 for each separate offense, plus customary court costs when applicable. A graduated fine schedule is to apply: a $30.00 increase for each recurring offense, beginning at $30.00 to a maximum of $300.00.
Full Breakdown
Part 3, Ch. 1, Sec. 3. That elevated limit runs "for the period within which construction is to be completed pursuant to any applicable construction permit issued by proper authority," or for a reasonable completion period if the permit sets no deadline, meaning the higher allowance is tied to an active, authorized project rather than a fixed calendar window. 4. The Regulation is adopted by Resolution CC07-202 and administered by the Sheriff's Office, which also enforces the county's separate building-permit and inspection requirements for the underlying project.
Violations & Fines
Construction noise above the 80/75 dB(A) construction-zone ceiling is a Class 2 Petty Offense under Section F.1, punishable under the penalty-assessment procedure of C.R.S. § 16-2-201 by a $30 fine plus court costs for the first offense, rising $30 per repeat violation to a $300 cap.
Frequently Asked Questions
Is there a set start time for construction noise in unincorporated Jefferson County?
Why is the construction noise limit higher than the normal residential limit?
What if the building permit doesn't list a completion deadline?
Sources & Official References
Other rules in Jefferson County
How Jefferson County compares: Cities with the Strictest Construction Hours·Compare Jefferson County to another location·View the Colorado noise ordinances overview
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