Boarding Houses as a Passive Investment: Do the Math Before You Buy

Boarding houses (rumah kos) almost always come up in conversations about passive income from property. Buying a boarding house building, renting it out room by room, and receiving money every month without much effort — it sounds ideal. In reality it can be like that, but only if you've calculated correctly and are realistic about everything involved. This article guides you through evaluating the feasibility of a boarding house investment before spending any money.

Calculating Yield: The Basic Validation You Can't Skip

Yield is the ratio of annual rental income to total investment. This is the most basic metric that must be calculated before deciding to buy any property for rental purposes.

Illustrative example (not actual figures — the market changes and real conditions depend heavily on your specific location):

Suppose the total investment for a ten-room boarding house building in Tembalang is Rp 1.2 billion including renovation and furniture costs. If each room is rented at a certain price and the average occupancy rate is eighty percent, you can calculate the gross yield from those figures. From this gross yield, deducting operational costs determines the actual net yield you receive.

A gross yield above seven to eight percent per year is generally considered attractive for boarding house properties in Indonesia — but you must calculate net yield after costs, not stop at gross yield.

Operational Costs That Must Be Factored In

The boarding house business has operational costs that beginner investors often fail to include in their calculations:

• Electricity and water. If borne by the owner and not separated per room, this can be very significant depending on the number of rooms and residents' usage patterns. Install a kWh meter per room if you want to control this cost.
• Routine maintenance and repairs. Paint, plumbing, locks, furniture damage, and various minor damages that will definitely occur. Conservative budget: five to ten percent of gross rental income per year for maintenance.
• Management fees. If you use a boarding house management service or digital platform, there's a commission that significantly reduces your net income.
• Tax on rental income. Rental income from property owned by individuals is subject to final income tax (PPh final). Make sure this tax obligation is already included in your net yield calculation.
• Vacancy or empty rooms. No boarding house is fully occupied all year round. For student boarding houses, vacancy can be high during semester breaks and the start of a new academic year. Your financial model should already include a realistic vacancy assumption.
• Building insurance. Often overlooked because its impact isn't visible day to day, yet fire risk and structural damage are real risks that can destroy your investment if left uninsured.

After realistically deducting all operational costs, a good net yield for a boarding house typically ranges from four to seven percent per year. Figures below four percent should raise the question of whether it's still competitive compared to other, more liquid investment instruments that don't require active management.

Location Determines the Occupancy Rate

Occupancy rate is the most sensitive variable in boarding house profitability. Location determines this directly and can hardly be compensated for by other factors:

• Near a university — consistent but highly seasonal demand. Anticipate high vacancy during long holidays and the changeover of the academic year.
• Near an industrial area or major office district — more stable demand throughout the year since workers don't have academic holiday seasons. Residents tend to stay longer and are more reliable as long-term tenants.
• Near a major hospital — a segment often overlooked by investors. Families of long-term inpatients need temporary accommodation near the hospital, and they tend to be willing to pay a premium for proximity and comfort.

Standard vs Exclusive Boarding Houses: Choosing the Right Segment

There are two very different approaches to the boarding house business, each with a different investment profile:

• Standard boarding houses: simple rooms, shared facilities, affordable prices. Lower initial capital and easier to fill, but the margin per room is thinner and tenant turnover is higher, requiring more active management.
• Exclusive or premium boarding houses: rooms with private bathrooms, AC, full furniture, stable WiFi, and good security. Rental prices are much higher but the market segment is more limited, quality expectations are higher, and maintenance costs are greater.

The choice of segment must match the existing location and market. An exclusive boarding house in an area where the main market is budget-constrained students is a mismatch that will cause chronically high vacancy.

Before deciding to buy a property to turn into a boarding house: visit at least five competing boarding houses in your target area. Ask the owners or managers directly what the average occupancy rate is throughout the year. Calculate for yourself whether the projected yield is still attractive compared to other investment instruments. If the numbers aren't convincing, don't buy just because having a physical asset feels safer than paper investments.