Seattle noise ordinance hours set two windows the city cares about most: nighttime quiet hours run from 10:00 PM to 7:00 AM on weekdays and from 10:00 PM to 9:00 AM on weekends and legal holidays, while construction is generally allowed from 7:00 AM to 10:00 PM on weekdays and from 9:00 AM to 10:00 PM on weekends and legal holidays. Some zones and some equipment get tighter windows than that, and the decibel caps themselves change once night begins.
Nighttime Quiet Hours
The quiet period starts at 10:00 PM every night. It ends at 7:00 AM Monday through Friday and at 9:00 AM on Saturday, Sunday, and legal holidays.1Seattle City Council. Ordinance 122923 – Section 25.08.420 The holidays that follow the weekend schedule are New Year’s Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, the day after Thanksgiving, and Christmas Day.2Seattle Department of Construction & Inspections. Noise Code
During those nighttime hours, every decibel limit that applies when a residential property is receiving the sound drops by 10 dB(A). The daytime residential-to-residential cap of 55 dB(A) falls to 45 dB(A) at night. The commercial-to-residential cap of 57 dB(A) falls to 47 dB(A). Because decibels are logarithmic, a 10 dB(A) reduction represents roughly half the perceived loudness, so 45 dB(A) sits just above a whisper. A loud party, thumping bass, or barking dog will clear that line without effort.
The nighttime reduction only protects residential receivers. Commercial-to-commercial and industrial-to-industrial situations keep the daytime limits around the clock.
Construction Hours by Zone
Construction has its own hours under SMC 25.08.425, and the allowed window depends on where the work is happening and what equipment is running. There are three tiers.
For most projects citywide, work is allowed from 7:00 AM to 10:00 PM on weekdays and from 9:00 AM to 10:00 PM on weekends and legal holidays.3Seattle Department of Construction & Inspections (SDCI). Noise Codes
Projects in multifamily and neighborhood commercial zones, including Lowrise, Midrise, Highrise, Residential Commercial, and Neighborhood Commercial zones, get a tighter evening cutoff:2Seattle Department of Construction & Inspections. Noise Code
- Weekdays: 7:00 AM to 7:00 PM
- Weekends and legal holidays: 9:00 AM to 7:00 PM
Impact equipment such as pile drivers, jackhammers, and pavement breakers gets the strictest window regardless of zone:2Seattle Department of Construction & Inspections. Noise Code
- Weekdays: 8:00 AM to 5:00 PM
- Weekends and legal holidays: 9:00 AM to 5:00 PM
Inside those windows, construction equipment is allowed to exceed the standard decibel limits by set amounts, measured at the receiving property line or 50 feet from the equipment, whichever distance is greater. Outside those windows, construction has to meet the same limits as any other noise source, which at night means the reduced nighttime caps on residential receivers.
What Counts As Allowed Noise Inside Those Hours
Being inside permitted hours does not remove the decibel ceiling; it just raises it. SMC 25.08.410 sets caps that depend on the zoning of the source and the receiver. Daytime baselines include 55 dB(A) for residential-to-residential, 57 dB(A) for commercial-to-residential, 60 dB(A) for industrial-to-residential and commercial-to-commercial, 65 dB(A) for industrial-to-commercial, and 70 dB(A) for industrial-to-industrial.
Two adjustments run on top of those numbers. Sounds with a pure tone component or a repetitive, pulsing quality trigger an additional 5 dB(A) penalty, lowering the effective limit. Short bursts get temporary allowances: up to 5 extra dB(A) for sounds lasting no more than 15 minutes in an hour, 10 extra dB(A) for sounds under 5 minutes, and 15 extra dB(A) for sounds under 1.5 minutes.
Daytime Exemptions
A handful of sounds are exempt from the decibel limits during daytime hours only, meaning the 7:00 AM to 10:00 PM weekday window and the 9:00 AM to 10:00 PM weekend and holiday window:4Seattle City Council. Ordinance 122923 – Section 25.08.540
- Bells, chimes, or carillons operating for no more than 5 minutes in any one-hour period
- Unamplified sounds from officially sanctioned parades and public events
- Firearms discharged on legally established shooting ranges
- Blasting
- Forest harvesting, agriculture, and silviculture when the receiving property is in a residential district
Every one of these exemptions ends at 10:00 PM. A church bell that rings freely at 6:00 PM can become a violation at 10:15 PM if it exceeds the reduced nighttime limits at a nearby residence.
Outdoor Amplified Events
Officially sanctioned musical events in public parks work on a different measurement standard rather than the zoning-based decibel table. Sound cannot exceed 95 dB(A) measured 50 feet from the source. If levels reach 105 dB(A) for a total of five minutes in any 30-minute period at that same distance, city officials can shut the performance down as a public nuisance.
Event organizers have to submit a noise management and mitigation plan with their permit application through SDCI, and applications without the plan are not processed.5City of Seattle. Outdoor Amplified Sound – Special Events The allowable level can be tailored to the venue. SDCI has set a limit of 98 dB(A) at 100 feet for Memorial Stadium, for example.
Variance Permits When Hours Do Not Work
When a project or event genuinely cannot fit inside the normal hours, Seattle allows a temporary noise variance through the Department of Construction and Inspections. Variances last a maximum of 14 days and are granted only when the activity will not disturb a substantial number of people or endanger public safety.6Seattle Department of Construction & Inspections. Temporary Noise Variance Application
Applicants describe the work, list every piece of noise-generating equipment that will run during the variance window, and lay out steps to reduce impact on neighbors, such as advance notification, avoiding alarms or sirens, and sound barriers. Nighttime utility work and road repairs make up most variance applications, since daytime lane closures on busy roads would cause their own problems. Outdoor events that need amplified sound beyond normal limits also go through this process. Ignoring the conditions of an approved variance can result in event termination, permit revocation, or prosecution under Chapter 25.08.5City of Seattle. Outdoor Amplified Sound – Special Events
Reporting Noise Outside Allowed Hours
Enforcement is split between two agencies, and calling the wrong one slows the response. SDCI handles noise from construction sites, mechanical equipment, and commercial facilities. Its violation complaint line is (206) 615-0808, and complaints can also be filed online.2Seattle Department of Construction & Inspections. Noise Code
Seattle Police handle everything else: loud parties, barking dogs, car stereos, musical instruments, motor vehicle noise, horns, sirens, and watercraft. The non-emergency number is (206) 625-5011, and 911 is for disturbances that feel threatening. Response times vary because officers prioritize safety emergencies, and the noise sometimes stops before an officer arrives.7Seattle Police Department. Noise Complaints Have the source address, the type of noise, when it started, and whether it is ongoing ready when you call.
Penalties for Violating the Hours
Under SMC 25.08.505, police must give a verbal warning first for residential disturbances. If the noise continues or resumes within 24 hours after a civil infraction notice is issued, the offense becomes a misdemeanor.8Seattle City Council. Ordinance 121192 – Section 25.08.805 The tiers:
- First violation: Class 1 civil infraction with a $250 fine8Seattle City Council. Ordinance 121192 – Section 25.08.805
- Continued or repeated violation within 24 hours: misdemeanor carrying up to $500 in fines, up to 180 days in jail, or both7Seattle Police Department. Noise Complaints
- Public disturbance noise under SMC 25.08.500: criminal offense from the start, punishable by up to $500 in fines, up to six months in jail, or both
- Failure to comply with an SDCI or Hearing Examiner order: up to $500 per day of noncompliance, up to six months in jail, or both, with each day counting as a separate offense
Knowingly creating unreasonable noise that disturbs others and refusing to stop when police order it is a criminal public disturbance right away, rather than following the civil-first path. For persistent commercial or construction violations, SDCI can issue corrective orders, and ignoring those orders triggers the per-day criminal penalty.