Glenn County, CA Noise Ordinances: Construction Hours (2026)

Glenn County addresses construction noise through the noise performance standard in its Unified Development Code, Section 15.56.100 (adopted by Ordinance 1183, 2006), rather than through a separate construction-hours chapter. That section lists the categories of noise exempt from the county's numeric dBA limits when 'standard, reasonable practices are being followed,' and it expressly exempts 'construction site sounds between 7:00 a.m. and 7:00 p.m.' The practical effect is a daytime construction window: work that generates noise during 7:00 a.m. to 7:00 p.m. is exempt from the one-hour equivalent sound-pressure limits in Tables B and C, while construction noise before 7:00 a.m. or after 7:00 p.m. is not exempt and must comply with the standard limits (for example, 45 dBA received at a residential property between 10:00 p.m. and 7:00 a.m.). The same section separately allows lawn and plant-care machinery fitted with functioning sound-suppression equipment to operate between 7:00 a.m. and 8:00 p.m. The amplified-sound rules in Chapter 10.25 target audio equipment specifically and do not govern construction machinery, so the zoning exemption is the operative reference for builders. These rules apply only in the unincorporated communities of Glenn County; Willows and Orland set their own construction-hours rules.