White noise for apartment and neighbour noise

Published 2026-05-18 · 9 min read

Apartment sleep is a noise-tolerance challenge in a way that detached-house sleep usually is not. Walls thinner than they should be, shared floors and ceilings, hallways carrying every door close and footstep, and the inevitability of having loud neighbours at unpredictable hours all combine into a sleep environment that often defeats good intentions. White and brown noise are the most cost-effective intervention for this problem, but only if matched to the specific frequency profile that gets through your walls. This page walks through apartment acoustics, why brown noise usually beats white for residential building noise, and when to escalate from masking to actual soundproofing.

What sound actually gets through your walls

Standard residential wall construction (gypsum drywall on wood or metal studs, with fibreglass batt insulation) transmits sound differently across frequencies. Low frequencies pass through more easily because they have longer wavelengths and excite the structural resonance of the wall assembly. High frequencies are absorbed more efficiently by the drywall, insulation, and surface materials. This is why upstairs footsteps (which produce a thump with substantial low-frequency content) carry through ceilings more than upstairs conversation does.

The standard quantitative measure is the Sound Transmission Class (STC), defined in ASTM E90. STC is a weighted single-number rating describing how much sound the assembly attenuates. Typical residential walls rate STC 30 to 45; party walls in newer construction often hit STC 50; high-end apartments and condo construction can reach STC 60. The HUD recommended minimum for multifamily housing is STC 50 for party walls and STC 55 for floor-ceiling assemblies, but enforcement is uneven and many older buildings sit substantially below this.

What this means practically: in a typical apartment with STC 35 to 40 walls, neighbour conversation at 65 dB on their side comes through at about 25 to 30 dB on yours, which is barely audible. Neighbour music at 80 dB on their side comes through at 40 to 45 dB on yours, which is disruptive at night. Neighbour bass at 90 dB on their side comes through at 60 to 70 dB on yours because the low frequencies leak more efficiently. Footsteps and door slams have transient peaks above ambient that are harder to mask than steady-state sound.

Why brown noise usually beats white for apartments

The frequency profile of what gets through residential walls is heavily low-frequency-weighted, particularly for the worst offenders (bass music, footsteps, low conversation, HVAC, plumbing). Brown noise concentrates its masking energy in the same low-to-mid band, which means each dB of brown noise does more masking work than each dB of white.

A practical illustration: white noise at 55 dB at the head masks neighbour speech reasonably well (the speech band sits in white noise's strength zone too) but does little against deep bass that has already lost most of its high-frequency content by the time it reaches you. Brown noise at 50 dB at the head masks both speech (still good, because brown still has mid-frequency energy) and bass (much better than white, because brown puts most energy where the bass lives).

For apartments specifically, the practical default is brown noise at 48 to 53 dB at the head, placed between you and the dominant noise source if room geometry allows. White noise is the second choice if brown is unavailable or you find the spectrum unpleasant. Pink sits in between. See brown noise for spectrum details.

What masking cannot fix

Three categories of apartment noise are largely unmaskable at sleep-safe volume.

One, very loud transient events. A door slam at 80 dB above the masking floor will wake you regardless of masking spectrum. The contrast is what triggers the arousal, and the duration is too short for habituation to help.

Two, structure-borne footstep impact. Upstairs footsteps transmit through the floor structure as impact noise, not airborne sound. Masking can soften the perception slightly but the underlying vibration is felt as much as heard. Ceiling treatment (resilient channel, decoupled ceiling) is the real fix; tenants typically cannot do it.

Three, persistent loud noise above 55 dB at the head. If neighbour music or party noise pushes the head-level dB above 55 to 60, the masking floor would need to exceed it to fully mask, which is above sleep-safe levels. The right answer here is to address the source: a polite knock, a building management complaint, a noise ordinance call. Many cities define quiet hours (typically 10pm to 7am) and provide enforcement; check your local rules.

Soundproofing improvements a tenant can make

Most lease agreements prohibit structural changes, but a tenant can still meaningfully reduce sound transmission with reversible interventions.

  • Heavy curtains. Floor-to-ceiling, weighted, against exterior walls. Reduces transmission from outside traffic and reflects internal sound, lowering reverberation.
  • Door sweeps and seals. Hallway noise enters through door gaps. A $10 door sweep at the bottom + adhesive foam weatherstrip around the frame eliminates a meaningful fraction of intrusion.
  • Rugs and underlay. Reduce noise transmission downward and absorb noise within the room, helping you and your downstairs neighbour both.
  • Bookshelves against shared walls. Mass + irregular surface helps with both transmission and absorption. A fully loaded bookshelf against a party wall is one of the most effective tenant-friendly upgrades.
  • Furniture and soft furnishings. Upholstered chairs, sofas, and headboards absorb sound. An empty hardwood-floor apartment reverberates noise; a furnished one absorbs it.

Stick-on acoustic foam panels are widely marketed but are typically a poor investment. They reduce reverberation within the room (mainly useful for music recording, not sleep) but do little against transmission. Save the budget for curtains and door seals.

The legal and social side

Most U.S. cities have noise ordinances setting limits on residential sound at specific hours. New York City's Department of Environmental Protection enforces a 7 dB-above-ambient cap during quiet hours; Los Angeles has a similar standard. Local rules vary widely; check your municipal code.

For chronic neighbour issues, the escalation path is typically: polite direct conversation first (the majority resolve at this step), then building management with documentation (a noise log with timestamps and dB measurements helps; the NIOSH SLM app is sufficient evidence), then formal complaint to the city. Going straight to police or city without trying neighbour conversation first frequently sours relationships in ways that masking cannot repair.

The HUD noise standards and ASTM transmission class metrics are not directly enforceable on existing buildings, but they form the basis for new-construction acoustic codes in most jurisdictions and can inform conversations with property managers about building-level remediation.

Frequently asked

Is a fan as good as a sound machine for apartment masking?

Often, yes. A box fan produces broadband noise with substantial low-mid energy, comparable to brown noise in spectrum if not as precisely shaped. The cooling benefit is a free bonus. See the fan-as-white-noise page.

Will my masking noise bother my neighbours?

Almost certainly not. Brown noise at 50 dB at your head is around 30 to 35 dB at the wall and 15 to 20 dB on the other side, well below ambient nighttime noise.

How loud is a typical noise ordinance limit?

Most U.S. cities cap residential noise at 50 to 60 dB during quiet hours (10pm-7am typical) at the receiving property line. Specifics vary; your city's environmental department publishes the rules.

Do white noise apps work as well as dedicated machines?

For most apartment use, yes. Phone-speaker output is limited but adequate at the volumes that are sleep-safe anyway. Smart speakers and Bluetooth speakers add room-fill that phones lack.

Sources

Brown noise for sleep →Masking a snoring partner →White noise for shift workers →Using a fan as white noise →Sound machine buyer's guide →

Updated 2026-04-27