"The walls are so thin I can hear my neighbor's TV." "I ran the washing machine at night and woke up to a complaint notice on my door."

These are scenes that catch foreigners new to Japanese apartment living off guard. Japanese multi-unit housing comes with many "unspoken rules" that no one writes down. Break them by accident and you risk awkward neighbor relationships — or, in worst cases, eviction notices.

This guide walks through what to check before signing, the rules around noise, garbage, and shared spaces, and the etiquette of move-in greetings — all from the angle of avoiding trouble.

Why are Japanese apartments so thin-walled?

Japanese rental properties come in four construction types.

Construction Soundproofing Rent Typical building
Wood frame (mokuzō) Low Cheap Older apartments, lofted units
Light-gauge steel Lower Mid Standard 2-story apartments
Heavy-gauge steel Average Mid Small to mid-size buildings
RC (reinforced concrete) / SRC High Expensive Larger buildings

Cheap "wood frame" and "light-gauge steel" buildings have poor soundproofing — TV sounds, footsteps, and conversations carry to neighbors and downstairs.

Think of it as "cheap apartment = noise-conscious apartment." If you're sensitive to sound, choose RC (reinforced concrete) for a major upgrade.

Pre-move-in checklist During the viewing, step on the floors, knock on the walls, and — if anyone's home above — ask whether you can hear footsteps. If the wall to the neighbor is just lightweight plasterboard, sound passes through easily. When possible, choose properties listed with sound insulation ratings of LL-45 or higher and L-50 or lower.

The line where noise becomes trouble

Most local governments and property managers reference Japan's Environmental Basic Law noise standards. For residential areas:

  • Daytime (6:00–22:00): 55 decibels or less
  • Nighttime (22:00–6:00): 45 decibels or less

For reference: a normal conversation is about 60dB, a vacuum cleaner is 70dB, a washing machine on spin cycle is 60–70dB.

There's no clear legal definition of "endurance limit" (jūnin gendo) — it's decided case by case in court. Practically speaking, "don't make noise after 10 p.m." is the safe baseline.

What not to do at night

  • Washing machine, dryer (vibration carries)
  • Vacuuming
  • Loud footsteps (heel-walking, jumping)
  • Dragging chairs
  • Slamming doors
  • Bath / reheating sounds (carry to the floor below)
  • TV, music (especially bass)

Children's footsteps carry more than you'd think

Heavy-impact floor noise (running, jumping) is mostly determined by the building structure itself — individual effort can't completely eliminate it. Families with kids should:

  • Lay joint mats and soundproof carpets
  • Have children wear slippers
  • Don't let kids run inside at night

These steps alone dramatically reduce trouble with the floor below. When you greet your downstairs neighbor at move-in, simply adding "we have a child, so we're being careful about noise" changes how complaints are received.

Garbage area rules

For details, see our Complete Guide to Japan's Trash Sorting Rules. Apartment-specific notes:

  • Garbage areas are usually on-site and dedicated (often available 24 hours)
  • Putting trash out on the wrong day brings warning notices from the management or landlord
  • Mis-sorted bags are left behind — you're responsible for taking them back
  • Tear up envelopes and shipping labels with your name or address before tossing them (privacy protection)

Don't put things in shared areas

Hallways, stairwells, and the area just outside your door are "shared spaces" (kyōyōbu) — and personal items are not allowed there.

Two reasons:

  1. Fire Service Act: Blocking evacuation routes during fire or earthquake brings fire authority intervention
  2. Building rules: Most condos make this explicit in their bylaws

Common items — can you leave them?

Item Allowed in front of door / hallway?
Bicycle No, except in the bike parking area
Stroller Fold it and store inside your unit
Umbrellas / umbrella stand Generally no (depends on building)
Forgotten garbage bags No (smell, insects)
Cardboard (online shopping) No
Delivered packages (placed by courier) OK briefly; long-term creates theft risk

Move-in greetings — yes or no?

"Bringing a small gift to introduce yourself to your new neighbors" is a long-standing custom — but it's been changing fast.

Recent trends (2024 surveys)

  • Single residents: 30–40% don't greet
  • Families: most do greet
  • Single women: increasingly choosing not to (for personal safety)

Standard scope (if you do)

In an apartment building, the standard is the two units on each side + two units directly above + two units directly below (six total — though four is also fine: two on each side plus the units above and below). For detached houses, "two on each side plus the three across the street" is common.

Greeting etiquette

  • Timing: Move-in day or within the next week
  • Time of day: Weekdays 18:00–20:00, weekends 10:00–18:00 (avoid mealtimes)
  • Gift: ¥500–1,000 (towels, detergent, sweets, plastic wrap, etc.)
  • What to say: "I just moved into unit [number], my name is [name]. I might cause some inconvenience — thank you for your understanding."
  • If they're out: Try about three times. If you still can't meet, hang the gift on the doorknob with a short note — or, for letter only, drop in the mailbox.

If you choose to skip greetings

In modern Japan, skipping greetings is not considered rude. However:

  • If anything about your situation might cause inconvenience (musical instruments, frequent video calls, children, etc.), greeting in advance dramatically reduces complaints

Pets and smoking

Pets

  • "Pets allowed" doesn't mean unlimited: Building rules typically restrict species (dogs, cats, small animals), number, and size
  • Hiding pets in "no pets" buildings: An immediate contract violation that can lead to eviction notices and restoration fee charges
  • Barking and odor: The two biggest sources of neighbor complaints. Choice of breed and training matter

Smoking

  • Balcony smoking ("Hotaru-zoku" — "firefly tribe"): Smoke drifts to neighbors' laundry and through open windows. A major source of disputes, and many buildings explicitly ban it
  • Indoor smoking: Stains wallpaper and fixtures yellow, leading to full-room repapering charges at move-out. Far from getting your shikikin back, you may face additional bills
  • E-cigarettes / heated tobacco: Still generate odor complaints and residue damage — check building rules

Visitors and long-term guests

Most rental contracts include a clause prohibiting non-tenants from staying long-term.

  • Planning to live with a partner: Declare this at signing and choose a "two-person OK" property
  • Family staying over a month: Consult the property management
  • Airbnb / subletting: Banned at virtually all properties (instant eviction grounds)

When trouble does happen

"My neighbor's noise is bothering me" / "I got a complaint" — what to do.

When you're the one bothered

  1. Don't talk to them directly: It usually escalates the conflict. Go through the property management or landlord
  2. Contact the property management: Don't identify the unit by number; describe objectively as "from the unit above / next door, at this time, this kind of sound"
  3. Keep a record: Note dates, types, and durations. For serious cases, also record audio
  4. Police (110): For genuine emergencies like late-night loud noise. They won't intervene in civil disputes but will issue a warning

When you're the one getting complaints

  1. Notes or verbal warnings: Take them seriously, identify the cause, and fix it (lay mats, change timing)
  2. Warnings via the management: Submit a written report of how you've improved
  3. If they confront you: Apologize and explain concrete steps you'll take. Defensiveness backfires

FAQ

Q. I want to play a musical instrument.

A. From the apartment search itself, choose properties marked "musical instruments negotiable" (gakki sōdan-ka). In standard properties, the rule is silent piano or electronic instruments with headphones. More properties now allow installing soundproof practice booths (¥100,000–300,000).

Q. Can I have friends over for a home party?

A. Generally yes, but large groups (10+), late-night hours, and outdoor (balcony) loud talking generate complaints. Keep timing and volume within reason and you'll be fine.

Q. My neighbor refused my move-in greeting.

A. Some people now actively prefer not to receive greetings. Just say "sorry to disturb" and bring the gift back. Don't pursue the relationship further.

Q. My baby won't stop crying.

A. Newborn and infant crying physically can't be stopped. Simply telling neighbors and the unit below in advance — "we have a baby, sorry for any inconvenience" — sharply reduces the complaint rate.

Q. The light bulb in the shared hallway is out.

A. The property management or landlord typically replaces these. Call or email the management. You don't need to do it yourself (and replacing it on your own and getting hurt may shift liability to you).

Q. My neighbor is foreign and our cultures clash.

A. Greeting and noise norms vary widely by country. The key is approaching with both curiosity about their customs and a calm willingness to share Japanese conventions. You can also ask the property management to provide multilingual materials.

Q. I'm staying short-term and don't plan to greet anyone. Is that a problem?

A. Short stays (under 6 months) generally aren't expected to do greetings. But you absolutely must follow the garbage, noise, and shared-area rules.

Final thoughts

Apartment living in Japan starts with understanding the cultural difference between "what doesn't bother me" and "what bothers them." Things you can do today:

  1. Confirm what construction your building uses (wood / steel / RC)
  2. Be careful with laundry, vacuuming, and footsteps after 10 p.m.
  3. Don't leave items on the balcony, in hallways, or in front of your door
  4. Greet the units on each side and above/below at move-in (or drop a written greeting)

These steps alone prevent about 90% of neighbor trouble.

At Nihongo-tomo, we offer free vocabulary lists for housing, neighbor relations, and dealings with property management. Learning words like "kujō" (complaint), "kanri kiyaku" (building bylaws), and "genjō kaifuku" (restoration) in advance helps you stay calm when issues arise.

References / 参考・出典

All content in this article is based on general customs and standards as of May 2026. Actual rules are governed by your specific property's management bylaws and rental contract.