How I Budget for Unexpected Major Repairs

Four years ago, a water heater in one of my rental units died on a Sunday night in January. The tenant called me at 9pm with no hot water, and by Tuesday I had a replacement installed for 210,000 yen. That bill didn’t hurt because I already had the money sitting in a dedicated account, untouched, waiting for exactly that kind of surprise. If I’d been budgeting month to month like a lot of new landlords do, that repair would have eaten into rent I’d already mentally spent on something else.

Running 9 properties for over 15 years has taught me that the real danger in this business isn’t the repairs themselves, it’s not planning for them. Roofs, water heaters, exterior walls, and plumbing all fail eventually, and none of them ask for permission first.

Why monthly cash flow thinking gets landlords into trouble

When you first start out, it’s tempting to treat rental income as spendable income the moment it lands in your account. I did this myself in my first two years as a landlord, and it worked fine right up until a tenant’s air conditioner compressor failed in August and I had to scramble for 95,000 yen I didn’t have set aside. The problem is that repairs don’t arrive on a predictable schedule. You might go 14 months with nothing but a stuck door lock, then get hit with two major failures in the same month. A budget that only accounts for average monthly costs will always fail you at the worst possible time.

My rule: 8 percent of gross rent, every single month

For the last decade, I’ve set aside 8 percent of gross rental income from every property into a separate repair reserve account before I touch a yen of it for anything else. On a property renting for 75,000 yen a month, that’s 6,000 yen going into reserves automatically. It sounds small, but across 9 properties it adds up to roughly 50,000 to 60,000 yen a month, which builds a meaningful cushion over a year. I treat this transfer like a fixed expense, not a discretionary one. It happens the same day rent clears, before I pay myself anything.

Sorting repairs into tiers so the fund doesn’t run dry

Not all repairs are created equal, and I’ve found it helps to think in tiers rather than one giant undifferentiated pile of savings. Here’s roughly how I categorize expected major costs across a typical property over a 20-year span:

• Water heater replacement: every 10-12 years, around 180,000-250,000 yen
• Exterior repaint and caulking: every 12-15 years, around 400,000-700,000 yen depending on size
• Roof repair or partial re-covering: every 15-20 years, often 300,000 yen or more
• Plumbing and drain line issues: unpredictable, but I budget 30,000-80,000 yen per incident
• Appliance failures (stove, air conditioner, intercom): every 8-10 years, typically 40,000-120,000 yen each

Once I know roughly when each of these is likely to hit, I can weight my reserve contributions instead of treating every property the same. A building I bought 11 years ago gets a slightly higher reserve rate right now because I know the roof is approaching the end of its realistic lifespan.

When I use the reserve fund versus when I finance

My rule of thumb is simple: anything under 150,000 yen comes straight out of the reserve fund, no questions asked. Anything above that, I stop and think about timing. If three properties all need work in the same quarter and my reserve balance would drop below roughly two months of total rental income across the portfolio, I’ll use a low-interest renovation loan for the largest item instead of draining the fund to zero. I never want to be in a position where a second surprise repair happens while the fund is already empty, because that’s exactly when landlords end up making rushed, expensive decisions.

A real example: the 380,000 yen exterior wall repair

Two summers ago, an inspection turned up cracking in the exterior siding of one of my older buildings, the kind of damage that lets water in behind the wall if you ignore it. The quote from a contractor came in at 380,000 yen. Because I’d been setting aside reserves for that specific property since I bought it, I had 420,000 yen sitting there and could pay the full amount within a week without touching my personal accounts or the reserves for any other property. Compare that to a friend of mine who manages 3 units without any reserve system. A similar repair on his property last year forced him to delay it for 4 months while he saved up, during which the damage got worse and the final bill was closer to 550,000 yen.

Reviewing and adjusting the budget once a year

Every December, I sit down with the reserve balances for all 9 properties and check three things: how much is in each fund, what repairs are realistically due in the next 24 months based on the age of the roof, water heater, and exterior finish, and whether my 8 percent contribution rate is still enough. When I bought two older properties in the same year, I temporarily bumped their individual rates up to 12 percent for about 18 months until the reserves caught up to a reasonable buffer. This annual review takes maybe 2 hours total, and it’s the single habit that has kept me from ever needing an emergency loan for a repair in over a decade of doing this.

That’s the system I use across all 9 of my properties, and it’s the reason a failed water heater or a cracked wall is an inconvenience for me instead of a financial emergency.

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