Guilford County, NC Noise Ordinances: Decibel Limits (2026)

Section 11-8 of the Guilford County Code makes it unlawful in the unincorporated county to make, permit or cause any unreasonably loud, disturbing, annoying or unnecessary noise, exempting construction performed under a government contract that mandates specific work hours. The ordinance defines each operative term: 'unreasonably loud or annoying' noise is substantially incompatible with its time and place; 'disturbing' noise interrupts the normal peace of an area as perceived by a person of ordinary sensibilities; and 'unnecessary' noise is excessive sound that disturbs a neighborhood's peace and could have been lessened without unduly restricting the maker's conduct. Whether a sound crosses that line is judged by weighing time of day, proximity to homes, whether the noise is constant or intermittent, its volume and intensity, whether it is electronically amplified, and the zoning and character of the area.

Among the eleven acts the ordinance lists as presumptively violating the section, subsection (b)(8) targets mechanical equipment powered by compressed air: any such device is a violation 'unless unreasonably loud, annoying disturbing or unnecessary noise created thereby is effectively muffled and reduced.' Unlike the radio, vehicle-stereo and loudspeaker clauses elsewhere in the same subsection, compressed-air equipment carries no distance-based shortcut; the county must show the equipment's actual noise meets the general 'unreasonably loud' definition, using the same time, place and intensity factors that apply to the section as a whole.

Exemptions cover emergency repair work, permitted government street construction, bona fide farm operations under G.S. 153A-340(b)(2), and aircraft or Piedmont Triad Airport Authority noise. An absentee property owner can be held civilly, but not criminally, liable for a tenant's violation once notified of a prior violation by personal service or certified mail.