How to Measure Neighbor Noise for a Complaint

Start with the goal: a pattern, not a perfect number

A neighbor-noise complaint rarely depends on one dramatic reading. The stronger record is a pattern: repeated dates, times, durations, and sound levels measured in a consistent way. If you can show that the same noise occurs most nights between 11:30 p.m. and 1:00 a.m., with bedroom Leq and Max values noted each time, your complaint becomes easier to understand.

Use the online sound meter as a documentation tool, not as a courtroom instrument. It shows A/C/Z weighting, Fast/Slow response, Leq, Min, Max, Peak, a timeline, octave spectrum, CSV export, snapshot images, and a share option. Audio is never recorded or uploaded, which is important when the issue involves private homes. If you install the site as an offline app, you can measure even when your connection is unreliable.

Phone readings need honest limits. Uncalibrated phones are often roughly ±3–7 dB in the 40–90 dB range. Calibrating against a reference meter can improve steady readings to about ±1–2 dB. Below about 30 dB, microphone self-noise matters; above about 110 dB, clipping can occur. If you use an iPhone, remember that iOS processing cannot be fully disabled.

Use the right metric for neighbor noise

For most neighbor complaints, use A-weighting and Slow response. A-weighting gives dB(A), the form used in much environmental-noise guidance. Slow response smooths the display so you are not chasing every tiny jump.

The most useful values are Leq and Max. Leq is the energy-average level over your measurement period. It answers, “How loud was this period overall?” Max shows the highest level reached on the selected response setting. It answers, “How loud did it get?” Peak is useful for bangs or impacts, but phone peaks can be limited by microphone and software processing.

Do not rely on a single screenshot of a high instant. A door slam or dropped object may be real, but one isolated number does not show duration. For music, footsteps, HVAC hum, barking, or late-night voices, a 5- to 15-minute measurement with Leq and Max is usually more meaningful.

Set up your measurement location

Measure where the problem affects you: your bedroom, living room, desk, or the property line if your ordinance uses property-line limits. Put the phone at about ear height, usually 1.2–1.5 meters above the floor. Keep it away from walls and windows by about 1 meter when possible. Do not place it against the shared wall unless you specifically note that location; wall contact can exaggerate vibration and reflected sound.

Keep conditions consistent. If the window is open one night and closed the next, write it down. If a fan, air purifier, or TV is running in your room, it can raise the measured level and muddy the record. When practical, turn off your own noise sources during the measurement.

A good note might read: “Bedroom, center of room, windows closed, phone on shelf 1.3 m high, A-weighted Slow, 10-minute Leq.” That is far more useful than “It was loud again.”

Keep a noise diary that someone else can follow

A noise diary is the backbone of a complaint. It shows frequency, duration, and impact. Keep it factual and boring. The goal is not to sound angry; the goal is to be clear.

Field	Example
Date	2026-09-28
Time	11:42 p.m.–12:18 a.m.
Location	Bedroom, windows closed
Source	Music bass from upstairs unit
Settings	dB(A), Slow, 10-minute samples
Leq	43 dB(A)
Max	57 dB(A)
Effect	Woke twice, could feel bass in bed
Evidence	CSV exported, snapshot saved

CSV export is useful because it preserves a timeline rather than a single value. Snapshot images are useful for quick summaries. If you later speak with a landlord, HOA, mediator, or local authority, provide a concise table first and detailed exports only if asked.

What levels are commonly considered problematic?

There is no universal neighbor-noise limit. Rules depend on country, city, zoning, building type, time of day, and whether the measurement is indoors or at the property line. Always check your local ordinance or lease.

That said, a few reference points help. WHO 1999 community-noise guidance discusses 30 dB(A) average inside bedrooms and 45 dB(A) maximum events for sleep protection. WHO 2018 environmental-noise guidance focuses on health effects from transport sources and reinforces the importance of nighttime exposure. Many local ordinances commonly set outdoor nighttime limits around 45–55 dBA and daytime limits around 55–65 dBA at a property line, but the details vary.

Indoor bedroom readings can be much lower than property-line limits. A bedroom Leq in the high 30s or low 40s may be disturbing at night even if an outdoor ordinance uses a different threshold. Low-frequency bass can feel intrusive while dB(A) looks modest, because A-weighting reduces low frequencies. In those cases, also note the octave spectrum and consider C-weighted readings as supporting context.

If you need familiar comparisons, use how loud is 40 dB, how loud is 50 dB, and the decibel levels guide. Comparisons should explain, not replace, the actual diary.

A practical measurement routine

When the noise starts, do not rush to capture the loudest second. Start a session and let it run. Use the same settings each time so the record is comparable.

1. Open the meter and select A-weighting and Slow response.
2. Put the phone in the same location and height you used before.
3. Start measuring when the noise becomes clearly noticeable.
4. Let the session run for at least 5 minutes, or for the full episode if practical.
5. Save Leq, Max, and a snapshot.
6. Export CSV when the event is important or recurring.
7. Write a short diary entry immediately.

For recurring night noise, consider measuring a background period too. A note such as “quiet bedroom before music: Leq 28 dB(A); during music: Leq 42 dB(A)” explains the change better than the louder number alone. Be transparent about the method.

Talk before escalating, when it is safe

If you feel safe doing so, start with a polite conversation or note. Many people do not realize how sound travels through floors, walls, and pipes. Be specific: “The bass is coming through the bedroom ceiling after 11 p.m.” is better than “You are always loud.” Offer a practical request, such as moving a speaker away from the wall, lowering bass, using rugs, or avoiding laundry late at night.

If direct contact is unsafe or has already failed, use the next channel your situation provides: landlord, building manager, HOA, mediation service, or local authority. Share a short summary first. For example: “Over 14 nights this month, music was audible in the bedroom after 11 p.m. on 10 nights. Measurements were taken with the same phone location using dB(A) Slow; typical 10-minute Leq was 40–46 dB(A), with Max up to 61 dB(A).”

That style is firm without exaggeration. It also avoids claiming that your phone is a certified meter.

Avoid common mistakes

Do not measure with your phone pressed to the wall and present it as a room level. Do not include your own TV, fan, or conversation unless you disclose it. Do not cherry-pick only the highest second from a long night. Do not state that a law was violated unless you have checked the exact ordinance and measurement method.

Also be careful with audio or video recordings. They may capture private speech, children, or identifiable household activity. A decibel diary is often less invasive and more focused. If you need legal evidence, ask the relevant authority or a qualified professional what they require.

When a phone is not enough

A phone record is supporting evidence. It can show that you acted reasonably, measured consistently, and noticed a repeatable pattern. It may help a landlord or mediator understand the issue. But formal enforcement may require a certified sound level meter, a defined measurement location, a calibration record, and an official procedure.

If the situation involves serious sleep loss, harassment, threats, or health concerns, do not wait for perfect measurements. Document what you can, preserve your diary, and use the appropriate support channel. The meter helps you communicate clearly; it does not replace judgment, local rules, or professional assessment.

For the technical side of phone measurement, see how to measure decibels with your phone. For sleep-specific thresholds and bedroom measurement tips, see noise level for sleeping.