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Noise and construction hours in Diamond Bar

Diamond Bar's own rules on noise and construction hours, with the code text for every value.

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Each rule below links to the section of the Diamond Bar Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Diamond Bar's code says

Diamond Bar code What Diamond Bar's code adds
Construction hours on weekdays
  • 7:00 a.m. to 7:00 p.m.
    Applies: Weekday construction, repair or demolition noise across a home or business property line. Health officer variances and utility emergency work are exceptions.
    § 8.12.720 · code text
    Operating or causing the operation of any tools or equipment used in construction, drilling, repair, alteration or demolition work between weekday hours of 7:00 p.m. and 7:00 a.m.
  • 6:30 a.m. to 8:00 p.m., never on Sundays.
    Applies: Construction, repair or earth-moving with loud equipment, such as air compressors or jackhammers, that disturbs people sleeping in a home.
    § 8.12.1210 · code text
    a person, on any Sunday, or at any other time between the hours of 8:00 p.m. and 6:30 a.m. the following day, shall not perform any construction or repair work
Construction hours on weekends and holidays
  • No construction at any time on Sundays or holidays.
    Applies: Construction, repair or demolition noise across a home or business property line. Health officer variances and utility emergency work are exceptions.
    § 8.12.720 · code text
    or at any time on Sundays or holidays, such that the sound therefrom creates a noise disturbance across a residential or commercial real-property line, except for emergency work of public service utilities or by variance issued by the health officer is prohibited.
  • No construction on Sundays.
    Applies: Construction, repair or earth-moving with loud equipment, such as air compressors or jackhammers, that disturbs people sleeping in a home.
    § 8.12.1210 · code text
    a person, on any Sunday, or at any other time between the hours of 8:00 p.m. and 6:30 a.m. the following day, shall not perform any construction or repair work
Noise limit at homes
  • No more than 40 dB inside a home.
    Applies: Measured inside a neighboring home. The limit may not be passed for more than 5 minutes in any hour.
    § 22.28.090 · code text
    All | Residential | 40
  • No more than 45 dB at night.
    Applies: Measured at residential properties, 10:00 p.m. to 7:00 a.m. May not be passed for more than 30 minutes in any hour.
    § 8.12.530 · code text
    II | Residential properties | 10:00 p.m. to 7:00 a.m. (nighttime) | 45
  • No more than 50 dB in the daytime.
    Applies: Measured at residential properties, 7:00 a.m. to 10:00 p.m. May not be passed for more than 30 minutes in any hour.
    § 8.12.530 · code text
    | | 7:00 a.m. to 10:00 p.m. (daytime) | 50
  • No more than 60 dBA.
    Applies: Air conditioning or refrigeration units installed before 1-1-80, measured on the neighboring property line, 5 feet above grade.
    § 8.12.810 · code text
    Any point on neighboring property line, five feet above grade level, no closer than three feet from any wall. | 60 | 55
  • No more than 55 dBA.
    Applies: Air conditioning or refrigeration units installed on or after 1-1-80, measured on the neighboring property line, 5 feet above grade.
    § 8.12.810 · code text
    Any point on neighboring property line, five feet above grade level, no closer than three feet from any wall. | 60 | 55
  • No more than 55 dBA.
    Applies: Air conditioning or refrigeration units installed before 1-1-80, measured at the center of the neighboring patio.
    § 8.12.810 · code text
    Center of neighboring patio, five feet above grade level, no closer than three feet from any wall. | 55 | 50
  • No more than 50 dBA.
    Applies: Air conditioning or refrigeration units installed on or after 1-1-80, measured at the center of the neighboring patio.
    § 8.12.810 · code text
    Center of neighboring patio, five feet above grade level, no closer than three feet from any wall. | 55 | 50
  • No more than 55 dBA.
    Applies: Air conditioning or refrigeration units installed before 1-1-80, measured outside the nearest neighboring living area window.
    § 8.12.810 · code text
    Outside the neighboring living area window nearest the equipment location, not more than three feet from the window opening, but at least three feet from any other surface. | 55 | 50
  • No more than 50 dBA.
    Applies: Air conditioning or refrigeration units installed on or after 1-1-80, measured outside the nearest neighboring living area window.
    § 8.12.810 · code text
    Outside the neighboring living area window nearest the equipment location, not more than three feet from the window opening, but at least three feet from any other surface. | 55 | 50

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

What are the noise rules and construction hours in Diamond Bar?

Diamond Bar's code: 7:00 a.m. to 7:00 p.m. (Weekday construction, repair or demolition noise across a home or business property line. Health officer variances and utility emergency work are exceptions.) (§ 8.12.720); No more than 40 dB inside a home. (Measured inside a neighboring home. The limit may not be passed for more than 5 minutes in any hour.) (§ 22.28.090).

General information, not legal advice.

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Diamond Bar Municipal Code — full text