New, Used, or Akiya? Buying Smart in Japan

Quick Answer: In Japan, buildings depreciate fast while land holds value — a wooden house is treated as near-worthless on paper after about 22 years, even if it's perfectly livable. That makes used homes and akiya (Japan's ~9 million empty houses) look cheap, but the building's age and seismic year quietly decide your mortgage, insurance, and tax breaks. New offers peace of mind at a premium; used and akiya offer value if you check the structure and financing first.

This is the third guide in our series on buying a home in Japan as a foreigner or couple. It's about what to buy — new or used, mansion or house, and whether those tempting cheap akiya are an opportunity or a money pit. The answers hinge on a quirk that surprises most newcomers: how Japan values buildings.

This is educational information, not financial or tax advice. Rules, tax reductions, and lending practices vary and change — confirm current details with the agent, a lender, your municipality, or a qualified professional.

Why do Japanese houses lose value so fast?

Because Japan taxes and values buildings on a fixed statutory useful life (法定耐用年数) — 22 years for wooden homes, 47 for reinforced concrete (RC). After that window, the building is treated as having almost no value, even though a well-built, well-maintained wooden house physically lasts far longer.

This isn't just an accounting curiosity — it drives real money:

New or used — which is the better buy?

Neither wins universally; it's a trade of certainty against value.

For most cross-border buyers watching their capital, a structurally sound used home is often the value play — provided a bank will finance it.

Should you buy a mansion or a house?

The choice shapes your monthly costs and your freedom:

A simple way to frame it: a mansion buys convenience and predictable (rising) fees; a house buys land and control in exchange for doing your own upkeep.

Are akiya a bargain or a trap?

Japan had roughly 9 million vacant homes as of the 2023 national Housing and Land Survey — a record 13.8% vacancy rate — of which about 3.85 million are genuinely idle (excluding rentals, homes for sale, and second homes). Many municipalities list them through akiya banks (空き家バンク) at strikingly low prices.

They can be a real opportunity — but go in clear-eyed:

An akiya is best seen as a renovation project with a cheap starting point, not a move-in-ready home.

How does the building's age affect your mortgage and taxes?

One date matters more than any other: June 1, 1981, when Japan's new seismic standard (新耐震基準) took effect. Homes built under it are designed not to collapse in a very strong (shindo 6-upper to 7) quake; older "旧耐震" homes were built only to withstand moderate shaking.

That line has teeth:

So before you commit to any used home or akiya, find the construction year and structure first — they decide your loan, your insurance, and your tax break.

How this fits your FI plan

The smartest purchase is the one that fits your numbers, not the lowest sticker price. A cheap old house with a big renovation bill and no mortgage can cost more than a financeable newer one. Run the real total — price, costs, and financing — through our Buy vs Rent calculator and Buy vs Rent guide, confirm what a bank will actually lend in can foreigners get a mortgage in Japan, then see how the commitment reshapes your timeline in the PlanTogetherFI calculator.

PlanTogetherFI is for educational planning only. It is not financial, legal, or tax advice. Useful-life rules, seismic standards, tax reductions, and lending practices depend on the property and change over time — confirm the specifics with the agent, a lender, your municipality, the NTA, or a qualified professional.

Frequently Asked Questions

Why do houses in Japan lose value so quickly?

Japan values buildings on a fixed statutory useful life — 22 years for wooden homes, 47 for reinforced concrete — so a wooden building is treated as near-worthless on paper after about 22 years, even if it's still perfectly livable. Land, by contrast, holds its value, so in an older detached house you're mostly buying the land.

Is it better to buy a new or used home in Japan?

Used is often better value because the steep early depreciation has already happened, giving you more space and location per yen. New costs a premium and drops in resale value fast, but offers modern seismic performance, energy efficiency, and a legally required 10-year defect warranty. The right choice depends on how long you'll stay and whether a bank will finance the used property.

Are akiya (cheap empty houses) a good deal?

They can be, but treat them as renovation projects, not move-in homes. Most are old and pre-1981 seismic standard, financing is hard because the building is valued near zero, and renovation plus hidden costs can dwarf the low purchase price. Municipal akiya banks (空き家バンク) are the usual place to find them.

What is the 1981 seismic standard and why does it matter?

On June 1, 1981, Japan's new seismic standard (新耐震基準) took effect, requiring buildings to withstand a very strong earthquake without collapsing. Homes built before it are riskier, harder to finance and insure, and — for the mortgage tax deduction — a used home built on or after January 1982 qualifies without a seismic certificate, while older ones need one.

Should foreigners buy a mansion or a detached house?

A mansion (RC) is lower-maintenance and easier to finance (47-year useful life) but carries rising monthly management and repair-reserve fees and only a tiny land share. A detached house usually means you own the land and have full control, but you self-fund all repairs and older wooden homes face more financing and seismic scrutiny.

Sources and further reading

Details reflect rules and data as of mid-2026 and can change. Always confirm a specific property's construction year, structure, financing, and tax treatment with the agent, a lender, your municipality, the NTA, or a qualified professional.