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Risks of Renting Without a Written Contract and How Owners Can Respond

A lease can be formed verbally even without a written agreement, but the risks are significant. Explains the clauses owners should include, such as repair obligations, prohibited uses, and termination terms, and how to use the contract effectively from an owner’s perspective.

Last updated: About 2 min read

A residential lease agreement is the documentary evidence of a property rental transaction and the only reliable standard for judgment when trouble arises. Although “a contract can be formed by a verbal promise,” operating rental property without a written agreement significantly increases legal risk.

Why is a residential lease agreement important for avoiding disputes?

A residential lease agreement sets out in writing the property details, rent, occupancy rules, prohibited acts, and scope of repair obligations. The contract is formed through signatures and seals, and any issues that arise afterward are judged based on the contents of the agreement. If the important matters explanation document and the agreement differ, the agreement takes precedence.

How it differs from a gratuitous loan for use

In contrast to a “lease agreement,” under which rent is paid, a contract for lending property free of charge is called a “gratuitous loan for use.” A gratuitous loan for use can be formed by verbal promise alone, but without a written document the standard for resolving problems becomes ambiguous.

Is occupancy possible even without a residential lease agreement?

Under the Civil Code, a lease agreement can be formed orally. However, without a written document, it lacks evidentiary force, making disputes over rent amount, move-out conditions, and repair cost allocation more likely. For owners, this also means losing the opportunity to set favorable conditions through special clauses.

Important items that should be included in a residential lease agreement

The basic items in a residential lease agreement are as follows.

  • Party information, property information, and intended use
  • Contract term and renewal (generally every two years)
  • Rent and rent revision conditions
  • Security deposit and late payment damages
  • Notice period for termination (usually 1 to 2 months in advance)
  • Prohibited acts and restoration obligations

Using special clauses to the owner’s advantage

Special clauses can modify default provisions of the Civil Code.For example, a clause making the tenant responsible for repairing equipment such as air conditioners can be valid. However, because unilaterally disadvantageous clauses are invalid under the Consumer Contract Act, the content must be set carefully.

Examples of prohibited acts that have increased in recent years

It is important to clearly state provisions addressing new types of trouble, such as unauthorized short-term rental operations, leaving personal belongings in common areas, and smoking on balconies.

Clearly define the scope of repair cost allocation

Articles 606 and 608 of the Civil Code impose repair obligations on owners, but they can be changed by special clause because they are default provisions. However, tenants cannot be made responsible for major repairs such as roof leaks. Describing the scope of repairs as specifically as possible helps prevent long-term disputes.

For practical management of rental operations, please also refer to the Complete Pre-Move-In Inspection Guide.

Frequently Asked Questions (FAQ)

Q1. Is an oral residential lease legally valid?

Yes. However, because it is difficult to prove, we recommend preparing a written agreement in all cases.

Q2. Which takes precedence, the lease agreement or the important matters explanation document?

If their contents differ, the residential lease agreement takes precedence. A contract is not formed merely by signing the important matters explanation document.

Q3. Can a special clause make the tenant bear all repair costs?

No. Unilaterally disadvantageous clauses are invalid under the Consumer Contract Act. As a rule, major repairs such as roof leaks remain the owner’s responsibility.

Q4. Is it necessary to prepare a new agreement at the time of renewal?

Yes. In general, a new residential lease agreement is prepared upon renewal. The terms can also be reviewed at that time.

Q5. Which side can request a rent revision?

Both the landlord and the tenant have the right to request rent negotiations. However, a unilateral rent increase can affect the relationship of trust with the tenant, so a careful explanation is necessary.

Daisuke Inazawa, President & CEO of INA&Associates Inc.

Author

President & CEOINA&Associates Inc.

President & CEO of INA&Associates Inc. Leads real estate brokerage, rental leasing, and property management across Greater Tokyo and the Kansai region. Specialises in income-property investment strategy and advisory for ultra-high-net-worth individuals.

Daisuke Inazawa is the President and CEO of INA&Associates Inc., a Japanese real estate firm headquartered in Osaka with a Tokyo branch. He leads the company's three core businesses — real estate sales brokerage, rental leasing, and property management — across the Greater Tokyo Area and the Kansai region.

His areas of expertise include investment strategy for income-generating real estate, profitability optimisation of rental operations, real estate advisory for ultra-high-net-worth individuals (UHNWIs) and institutional investors, and cross-border real estate investment. He provides data-driven, long-horizon advisory to investors in Japan and overseas.

Under the management philosophy "a company's most important asset is its people," he positions INA&Associates as a "people-investment company" and is committed to sustainable corporate-value creation through talent development. He also writes and speaks publicly on leadership and organisational culture in times of change.

He has passed eleven Japanese professional qualification examinations: Licensed Real Estate Broker (Takken), Certified Real Estate Consulting Master, Licensed Condominium Manager, Licensed Building Management Supervisor, Certified Rental Housing Management Professional, Gyōseishoshi Lawyer (administrative scrivener), Certified Personal Information Protection Officer, Class-A Fire Prevention Manager, Certified Auctioned Real Estate Specialist, Certified Condominium Maintenance Engineer, and Licensed Moneylending Operations Supervisor.

  • Licensed Real Estate Broker (Takken)
  • Certified Real Estate Consulting Master
  • Licensed Condominium Manager
  • Licensed Building Management Supervisor
  • Certified Rental Housing Management Professional
  • Gyōseishoshi Lawyer (Administrative Scrivener)
  • Certified Personal Information Protection Officer
  • Class-A Fire Prevention Manager
  • Certified Auctioned Real Estate Specialist
  • Certified Condominium Maintenance Engineer
  • Licensed Moneylending Operations Supervisor