How to measure
neighbor noise.

To measure neighbor noise on your iPhone, open a dBA sound level meter at the exact spot where the noise bothers you, hold the peak for the loudest bursts, and write down the date and time. A phone reading is an honest estimate, not a calibrated Type 1 or Type 2 meter, so it will not stand alone as legal proof. What it can do is build a credible, timestamped log you take to your landlord or local housing authority.

That distinction matters more than most apps admit, so the rest of this guide is built around it: how to take a reading that actually means something, what that reading can and cannot prove, and exactly when to hand the problem to someone with certified equipment.

What a phone reading can and cannot prove

Start with the honest limits, because they shape everything you do next. A smartphone microphone is engineered for voice calls, not metrology. It varies from device to device, can compress or clip very loud sounds, and is not certified to any measurement class. Professional noise enforcement uses sound level meters built to a precision standard, commonly described as Type 1 (precision) or Type 2 (general purpose) instruments, and reviewed against the kind of occupational measurement practice the OSHA occupational noise overview describes. Your phone is not one of those.

There is a second limit that no calibration can fix: a sound meter measures a level in the air at one point. It cannot prove the source. A 58 dBA reading in your bedroom at 1 a.m. does not, by itself, prove the sound came from the unit next door rather than the street, the building plumbing, or your own refrigerator. An adjudicator will want that link established by context, not by the number alone.

So here is the realistic ledger:

This is not legal advice. Noise law is local, and the value of any reading depends on your jurisdiction.

The method: take a reading that means something

A sloppy reading is worse than none, because it is easy to dismiss. The goal is consistency: the same place, the same way, every time, so your log reads like a record instead of a handful of dramatic screenshots. Position is everything here. Measure where you actually hear the problem, and capture the peaks, not just the average.

1. Measure at the affected spot

   Stand where the noise genuinely disturbs you: the middle of the bedroom, the head of the bed, the spot on the sofa where you cannot hear the TV. Keep the phone roughly at head height and away from walls and hard surfaces, which reflect sound and inflate the number. Resist the temptation to press the phone against the shared wall to get a big reading; that measures the wall, not your living conditions, and it makes the log easy to attack.

2. Let the room settle, then start

   Close your own noise sources first (TV, fan, dishwasher) so the reading reflects the intrusion, not your kitchen. Then start measuring and let it run through a representative stretch of the disturbance rather than a single second.

3. Hold the peak for the loudest bursts

   Neighbor complaints usually live in the spikes: the slammed door, the bass drop, the 3 a.m. argument. An average across a whole evening can look deceptively calm. Use a peak-hold marker so the loudest moment is captured and stays on screen, and note both the typical level and that peak.

4. Log the date, time, and what you heard

   Write down the date, the clock time, the typical dBA, the peak dBA, and a one-line description (“heavy bass and shouting, upstairs”). Time of day is critical, because most ordinances are stricter at night. A reading without a timestamp is an anecdote; a reading with one is a record.

5. Repeat until you have a pattern

   One reading proves a moment. A dozen readings across different nights prove a pattern, and a pattern is what moves a landlord or an authority. Capture the quiet baseline too, so the contrast is visible in your own notes.

Honest Decibel is built for exactly this kind of logging. It shows real-time A-weighted dBA with a peak-hold marker for the loudest moment, ticks haptically as you cross noise bands so you do not have to stare at the screen, and runs fully offline. There is no account and nothing leaves your phone, which matters when the log is about a dispute with someone living a few feet away.

What the numbers mean (and a sense of scale)

Decibels are reported in dBA, the A-weighted scale that tracks how human hearing perceives loudness and the scale health agencies use for noise guidance. A few anchors help you read your own log. The CDC and NIOSH describe normal conversation at home at roughly 60 dBA; for hearing safety, NIOSH recommends keeping exposure at or below 85 dBA averaged over an eight-hour day, with the safe time halving for every additional 3 dB.

Most neighbor noise sits well below the hearing-damage range. The problem is rarely that the noise is unsafe; it is that the noise is intrusive at the wrong hour. That is why local ordinances tend to set limits by time of day rather than by hearing risk, and why your timestamps matter as much as your decibels. Typical residential ordinances often land somewhere in these rough bands, but the exact figures and the legal measurement point vary by city or county, so treat this only as orientation:

Ranges are illustrative, not legal thresholds. Check your local noise ordinance for the binding numbers and where they are measured. For background on national noise policy, the U.S. EPA summarizes its role under the Clean Air Act Title IV noise program, and the WHO covers noise and hearing health.

When to escalate to professional measurement

Your log is a starting move, not the whole game. Use it to open a polite, documented conversation first, usually with the neighbor, then with the landlord or property manager. Attach a short summary: dates, times, typical and peak dBA, what you heard. Most disputes that get resolved are resolved at this stage, because a calm record is hard to ignore and easy to act on.

Hand the problem to someone with certified equipment when any of these is true:

• An informal complaint and your log have not changed the behavior.
• You are moving toward a formal complaint, lease enforcement, or legal action.
• An authority asks for an official reading, or your ordinance specifies who must take it.

At that point, your local environmental health office, code enforcement, or housing authority is the right call. These offices frequently own calibrated Type 1 or Type 2 meters and can produce a measurement that carries legal weight, taken at the location your ordinance specifies. Your phone log does real work here too: it tells them when to show up, which is often the hardest part of catching intermittent noise.

Why an offline, no-account app matters here

Noise disputes are personal. The other party lives on the other side of a wall, and a log of timestamps is, in effect, a record of when you were home and what was happening. Honest Decibel computes everything on device. There is no account, no analytics, no server call, and the microphone is on only while you are actively measuring. The log you build stays on your phone, which is exactly where a record about your own neighbor should live until you choose to share it.

Questions people ask

Keep reading

• Honest Decibel: Sound Meter The offline dBA meter with peak-hold and haptic band ticks, no account, nothing leaves your phone.
• Decibel Levels of Everyday Sounds A real-world dBA chart, and when each level becomes risky.
• Are My Headphones or AirPods Too Loud? How to check your listening volume in dB and keep it safe.

Honest Decibel is one of the small, private iOS tools in the Keltek apps studio.