Accused of Subletting in Japan? What to Do When Your Landlord Says You Violated the Lease

Updated November 2026 · GaijinHome

Maybe a friend stayed in your apartment for three weeks while you were back home. Maybe your partner moved in and nobody told the management company. Maybe you listed your room on a short-stay platform for a few weekends to cover rent while you travelled. Then a letter arrives, or the agent calls, and the words are blunt: "This is a violation of your contract. Unauthorized subletting is prohibited." Some letters ask you to stop immediately. Others mention contract termination.

If you are reading this in a panic, take a breath. In many cases this situation can still be repaired, especially if you act quickly, stay honest, and put things in writing. This article explains what is actually happening, why Japanese landlords treat subletting so seriously, the mistakes that make it worse, and a step-by-step plan to resolve it.

What actually happens

In Japan, the person named on the lease (the 契約者, keiyakusha) is usually the only person allowed to live in the unit, plus any residents who were listed on the application (入居者, nyūkyosha). Almost every standard residential lease includes a clause that prohibits two things without the landlord's written consent:

• Subletting (転貸, tentai, or more casually 又貸し, matagashi): letting someone else live in the unit, whether or not they pay you.
• Assignment (賃借権の譲渡): handing your tenancy over to someone else, for example "giving" your apartment to a friend when you leave Japan.

Many leases also require you to notify the landlord before adding a cohabitant (同居人, dōkyonin), and most explicitly ban using the unit as lodging for paying guests. In practice, a violation usually gets noticed in one of these ways:

• Neighbors report unfamiliar people coming and going with suitcases.
• The building manager sees a different name on the mailbox or delivery slips.
• Someone finds the unit listed on a vacation rental site.
• Noise or garbage problems lead to a visit, and the person who answers the door is not the tenant.
• The guarantor company flags a change during a renewal or payment issue.

The first contact is usually a warning letter or phone call from the management company (管理会社, kanri-gaisha). If the problem continues or was serious (for example, repeated paying guests), the next step can be a formal notice demanding correction by a deadline, and then a notice of contract termination. Japanese tenant protection is fairly strong, so a landlord generally cannot throw you out on the spot or change the locks themselves. However, unauthorized subletting is one of the few lease breaches that Japanese courts tend to take seriously, because it breaks the trust relationship the lease is based on. That is why you should treat the very first warning as important.

Why it happens

Many foreign residents are surprised by how strongly landlords react, especially when the "subletter" was a friend staying for free. The reaction makes more sense once you understand how renting works in Japan.

The screening was done on you, not on the person staying

Before you signed, the landlord and the guarantor company (保証会社, hoshō-gaisha) checked your income, your visa status, your period of stay, and your emergency contact. The person living in the unit now has not been screened at all. From the landlord's point of view, a stranger is living in their property with no checks and no contract.

Guarantor coverage may not apply

Guarantor companies cover the tenant they approved. If an unapproved occupant damages the unit or stops paying you, the landlord worries that the guarantor company will dispute the claim. That risk alone is enough for many owners to act fast.

Short-stay rentals are tightly regulated

Renting a residence to paying short-term guests is regulated in Japan. Private lodging generally requires registration under the minpaku rules (住宅宿泊事業法) or another license, and many buildings and some local areas restrict it further. Most condominium management rules (管理規約) ban it outright. If your unit was listed on a vacation rental site without permission, the landlord may face complaints from the building association or local authorities, which is why these cases escalate the fastest.

Visa and contract periods

Landlords often worry about tenants who leave Japan and keep the apartment "for a friend." The lease is tied to a person whose residence status they checked. If that person is abroad for months and someone else is living there, the owner has no idea who is responsible.

Language and emergency contacts

If something goes wrong, such as a water leak, fire, or medical emergency, the management company needs to reach the actual occupant. When the occupant is unknown and the official tenant is overseas or does not speak Japanese, that becomes a real safety concern for the building.

Common mistakes

1. Assuming a free stay is not subletting. Many leases ban letting anyone else live there without consent, paid or not. A friend staying for a weekend is normally fine, but weeks or months of someone else living there while you are away can be treated as a violation.
2. Denying it when there is evidence. If the management company has photos, a listing screenshot, or neighbor reports, denial destroys trust and makes termination more likely. Honesty plus a fix is almost always the stronger position.
3. Replying only by phone. Phone calls in Japanese are easy to misunderstand and leave no record. Follow up any call with a short written message or letter.
4. Quietly continuing. Some people stop for a week and then start again. A second violation after a warning looks much worse and gives the landlord a much stronger case.
5. Moving out without settling. Leaving Japan or moving out without proper cancellation can leave you liable for rent, cleaning, and damage costs, and the guarantor company may pursue you or your emergency contact.

Step-by-step fix

1. Read your lease and house rules. Find the clauses on subletting (転貸), assignment, cohabitants (同居人), and prohibited uses (禁止事項). Check whether the lease requires notice or written consent, and whether the building has separate management rules. Knowing exactly what you signed tells you how serious the issue is.
2. Stop the activity right away. If you had paying guests, delete or deactivate the listing and cancel future bookings. If someone else is living there, agree on a move-out date with them. Keep screenshots showing the listing was removed.
3. Reply in writing within a few days. Keep it short, polite, and factual. You can write something like: "I apologize for not asking permission in advance. The person staying has now left / will leave by [date]. I will not let anyone else live in the unit without your written consent." In Japanese, a simple version is: 「事前に許可を得ずに申し訳ございませんでした。今後は書面での承諾なしに第三者を居住させません。」 Ask a Japanese-speaking friend or a translation service to check it if needed.
4. If the other person should legitimately stay, ask for consent properly. If your partner or family member moved in, ask the management company how to register them as a cohabitant. They may ask for the person's residence card, proof of relationship, and sometimes a new screening by the guarantor company. A small fee or a rent adjustment is possible. Getting it added officially is much better than hoping nobody notices.
5. Offer to cover any damage or costs. If guests caused damage, noise complaints, or extra cleaning, offering to pay for it shows good faith. Ask for an itemized estimate before agreeing to an amount.
6. Keep records of everything. Save letters, emails, LINE messages, and notes from phone calls with the date and the staff member's name. If the situation escalates, a clear record of your cooperation matters.
7. Get advice if termination is mentioned. If you receive a notice of termination or a demand to vacate, contact a lawyer, the Japan Legal Support Center (法テラス, Hō Terasu), or your local government's foreign resident consultation desk before agreeing to anything. Many cities offer free consultations with interpreters. Read our eviction notice guide for what the process looks like.
8. If you need to leave anyway, plan a clean exit. Give proper notice according to your lease (often one to two months), arrange the move-out inspection, and settle rent through the end date. If you need somewhere flexible to live while you sort things out, a furnished share house can bridge the gap without a new guarantor. [PR] Oakhouse share houses and apartments accept many foreign residents and allow shorter contracts.

If your real need was a flexible place for a friend or family member visiting long term, it is usually easier to rent them their own short-term space than to try to fit them into your lease. Our article on renting without a guarantor explains options that do not require a full screening.

Required documents

Depending on whether you are fixing a violation, registering a cohabitant, or moving out, keep these ready:

• Your lease agreement (賃貸借契約書) and any house rules or management rules (管理規約 / 使用細則)
• Your residence card (在留カード) and passport
• The cohabitant's residence card (在留カード) or passport, if you are adding them
• Proof of relationship for a spouse or family member, such as a marriage certificate (婚姻証明書), if requested
• The warning letter or notice you received, plus copies of your written replies
• Screenshots showing any rental listing has been removed
• Your guarantor company contract or member number (保証会社の契約書)
• Bank details for any refund of the deposit (敷金) after move-out

City / region differences

The basic rules on subletting are national and apply everywhere in Japan, but enforcement and local context differ.

Rent and fees do not change much because of a violation itself, but if you end up moving, budget for a new deposit, key money, agency fee, and guarantor fee. Depending on the city and unit, upfront costs often add up to several months of rent. Our hidden costs breakdown explains each item.

Frequently Asked Questions