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Can You Get a Mortgage for a Home With Rental Units? Conditions and Key Risks

Explains the conditions and precautions for obtaining a home mortgage on a combined-use house with rental units. Covers the 50% owner-occupancy rule, builder constraints, and repayment risks from an investor’s perspective.

Last updated: About 1 min read

A combined owner-occupied and rental home allows you to secure both a residence and rental income at the same time. It has drawn attention because it may allow you to use a low-interest home mortgage. In this article, we explain the conditions for obtaining a home mortgage for a combined rental home and three key points to watch when using full financing.

What Is a Combined Rental Home and Why Is It Attracting Attention?

A combined rental home is a property that includes both an owner-occupied area and a rental area. Because the owner can earn rental income from the leased portion, that income can be used toward monthly loan repayments. It also offers flexibility, allowing the property’s use to change as lifestyle needs evolve.

What Are the Conditions for Getting a Home Mortgage?

Even for a combined rental home, construction with financing is possible. However, whether a home mortgage or an apartment loan applies depends on how the property is configured.

A Home Mortgage Can Be Used if the Living Area Is 50% or More

One condition for a home mortgage is that at least 50% of the total floor area must be used as the owner’s living space. For example, in a three-story building, a low-interest home mortgage may be available if the first and second floors are used as the residential portion.

If It Is 50% or Less, an Apartment Loan Applies

If the living area is 50% or less, the property is generally viewed as having stronger income-generating characteristics, and only an apartment loan will apply. The interest rate is higher, but the larger rental area can also support higher rental income.

Three Points to Watch When Using a Full Home Mortgage

Point 1: Your Choice of Home Builders Becomes More Limited

Depending on the financial institution, financing may be available only if you use a designated home builder. It is advisable to consult a home builder first and then identify the financial institutions that can offer a home mortgage for the project.

Point 2: Your Health Condition Affects the Screening Process

In many cases, enrollment in group credit life insurance is required, and if your health condition is judged unfavorably, the home mortgage may not be approved. Your age at the time of application also affects the review, so an earlier contract is generally preferable.

Point 3: Vacancy Risk Can Increase Your Repayment Burden

If you cannot secure tenants and the vacancy period becomes prolonged, your rental income may fall to zero, requiring you to make monthly repayments from your own funds. You should therefore consider carefully whether the area is likely to maintain strong demand even decades from now.

Frequently Asked Questions (FAQ)

Q. What interest rate applies to a home mortgage for a combined rental home?

The same interest rates as a standard home mortgage generally apply. As a rough guide, variable rates are around 0.3% to 0.7%, while fixed rates are around 1% to 2%.

Q. Is a combined rental home eligible for the home mortgage tax deduction?

If the owner-occupied portion is 50% or more, the property is eligible for the home mortgage tax deduction. However, the deductible amount is based on the loan amount corresponding to the owner-occupied portion.

Q. Can the entire property be converted to rental use in the future?

Yes, but doing so may violate the terms of the home mortgage contract. You should confirm this with your financial institution in advance.

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