Skip to content
Real Estate Intelligence
INA NETWORK

What Are the Pros and Cons of One-Room Apartment Investment? Yields and Risks Beginners Should Know

Explains the pros and cons of one-room apartment investment from an investor's perspective. Covers initial costs, liquidity, vacancy risk, expense ratios, and other essentials for investment decisions.

Last updated: About 1 min read

One-room apartment investment is a popular entry point into real estate investing. The initial cost is relatively modest and it is easy to get started, but it also comes with its own risks. In this article, we analyze the advantages and disadvantages of one-room apartment investment from an investor's perspective.

What are the advantages of one-room apartment investment?

One-room apartment investment offers three strengths that are not found in the same way in other types of real estate investment: a low initial outlay, high liquidity, and a large supply of properties.

You can start with a lower initial investment

Depending on the building age and location, one-room apartments can be purchased from a relatively accessible price range. Because the loan amount is smaller, the downside remains more limited even if the investment does not work out, making it easier to build a realistic investment plan.

High liquidity

When it comes time to sell, you can appeal to a wide range of buyer segments, including owner-occupiers, investors, and second-home buyers. That broadens your exit options compared with whole-building properties.

Abundant property information and easy comparison

Because many properties are available on the market, it is easier to find one that matches your criteria for location, price, and yield.

What are the disadvantages of one-room apartment investment?

Understanding the risks behind these advantages is the key to investing successfully.

Vacancy risk is concentrated

Because there is only one unit to rent out, prolonged vacancy means rental income drops to zero, which is a critical risk. You do not get the diversification effect that an apartment building can provide.

Expense ratios tend to be higher

When operations are spread across separate units, the management cost per unit tends to be relatively high.

You cannot decide on rebuilding by yourself

Because it is condominium ownership, you can participate in decisions on rebuilding or major repairs, but you cannot move those decisions forward based on your judgment alone.

Checklist for investment decisions

ItemCheckpoint
LocationWithin a 10-minute walk from the station and in an area with population growth
YieldA gross yield of 5% or more is a useful benchmark
Vacancy rateResearch the vacancy rate in the surrounding area
Management fee and repair reserve fundCheck whether the monthly burden puts pressure on cash flow
Building ageMeets the post-1981 new earthquake-resistance standard

Frequently Asked Questions (FAQ)

Q. How much money do you need to start one-room apartment investment?

For a pre-owned property, it is possible to buy from a few million yen. However, you should also expect additional costs equal to 7% to 10% of the property price.

Q. Which is better for investment, a new property or a pre-owned one?

If yield is your priority, a pre-owned property is often more suitable. If preserving asset value matters more, a new property may be the better fit. Choose based on your investment objective.

Q. How can you reduce vacancy risk?

The most effective approach is to choose a property in an area with stable rental demand, such as near a train station or a university. You may also want to refer to differentiation strategies for rental management.

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