Japan’s 9 Million Empty Homes — Inside the Akiya Crisis

The headline comes from the Statistics Bureau of Japan, which surveys the national housing stock every five years. Its final results, published in September 2024, recorded 65,047,000 dwellings, of which 9,002,000 stood vacant — up 513,000 from 8,489,000 in 2018 [1]. The vacancy rate rose from 13.6% to 13.8%, and both the count and the rate are the highest on record ✓ Established [2]. Homes have outnumbered households in Japan since 1968, and by 2023 there were 1.16 dwellings for every household [1]. In a country whose population has fallen for 14 consecutive years [51], that surplus is no longer a cushion. It is a residue — the physical trace of families that have moved away, aged into care homes or died without anyone to take their place [3]. The akiya, the empty house, has become the most visible unit of measurement for Japanese depopulation.

The bureau’s own summary is unusually blunt. Vacant homes, it notes, have increased without interruption, roughly doubling over the 30 years from 1993 to 2023 [1]. In 1993 Japan had about 4.5 million empty dwellings; three decades later it has twice as many, while the national population has peaked and turned down [3]. The increase has not been confined to remote villages. Tokyo has the largest absolute number of vacant homes of any prefecture, close to 900,000, up 35% from about 665,000 in 2003, and Osaka has around 700,000 [52]. Most of the capital’s vacancies, however, are rental flats between tenants. The vacancy rate tells a different geographic story from the raw count — and it is the rate, not the count, that reveals where depopulation is doing structural damage to towns and villages.

Rural and peripheral prefectures sit at the top of the table. Tokushima recorded a vacancy rate of 21.3%, Wakayama 21.2%, Kagoshima 20.5%, Yamanashi 20.4%, Kochi 20.3% and Nagano 20.1% [1]. At the other end, Saitama stood at 9.3%, Okinawa at 9.4%, Kanagawa at 9.8% and Tokyo at 10.9% ✓ Established [1]. Roughly one dwelling in five is empty across a swathe of western and central Japan, against one in ten around the capital. The gap is not explained by different building habits or different survey methods. It tracks, almost exactly, the map of where young people have left and where older residents have stayed behind [3] [9]. The prefectures with the highest vacancy are also those with the oldest populations and the fewest young women, the measure that demographers use to judge whether a community can renew itself.

The figure of 9 million needs one important qualification. Nearly half of it — 4,436,000 dwellings — is ordinary rental stock between tenants, a normal feature of any housing market [1]. A further share consists of homes on the market and second homes. The category that matters most is the one the bureau calls other vacant homes: dwellings that are not for rent, not for sale and not used as holiday homes. These numbered 3,856,000 in 2023, up 369,000 in five years, and equal to 5.9% of all housing ✓ Established [1]. Nippon.com’s analysis of the preliminary data found that this category made up 42.8% of all vacancies, up from 32.1% in 2003, and accounted for 72% of the increase since 2018 [3]. This is the akiya problem proper: houses that have simply dropped out of use, with no plan for their future and often no one actively deciding anything about them at all.

Detached houses dominate that core. Of all vacant detached homes, 80.9% — 2,851,000 dwellings — fall into the other category [1]. The pattern points to a particular life cycle. A family home is built in the 1960s, 1970s or 1980s; the children move to a city for university or work; the parents age, enter a care facility or die; and the house passes to heirs who live elsewhere and have no use for it [3] [5]. Nippon.com summarised the dynamic plainly: after parents living far away move to nursing homes or pass away, families find it difficult to dispose of the homes and leave them vacant [3]. Nothing in that sequence requires a policy failure. It requires only that a generation of owners outlives its local heirs, which is exactly what the demographic data show happening across most of the country.

The outlook is for more of the same. In June 2024 Nomura Research Institute projected that Japan’s vacancy rate could reach about 25% by 2043, with roughly 18.61 million empty homes, unless demolition and conversion accelerate ◈ Strong Evidence [4]. It also estimated that deteriorated vacant detached houses — homes already in poor physical condition — numbered 820,000 in 2023 and could reach 1.65 million by 2043 [4]. Projections of this kind depend on assumptions about construction and demolition, and an earlier Nomura scenario that foresaw 21.7 million vacant homes, about a third of the stock, by 2033 has since been revised down [43]. But no credible projection shows the number falling. The question this report examines is therefore not whether Japan will have more empty houses, but what that does to the places where they stand — and whether anything the state has tried is equal to the scale.

Start with value. Japanese tax and market practice treat a wooden house as a wasting asset. Its statutory useful life for depreciation is 22 years, and in the resale market a wooden detached home is commonly valued at close to zero after about 20 years, trading at the price of the land beneath it [12]. Yuki Akiyama of Tokyo City University described the cultural side of this in 2024: in Japan, the newer the house, the higher the price it sells for [5]. A house built in 1975 in a declining town is therefore worth little as a building and often little as land. For heirs, it is less an asset than a liability with maintenance costs, insurance and an annual tax bill attached [43]. The rational response to an asset with negative value is to avoid touching it, and many heirs do exactly that.

The second element is the market itself. Japan has an unusually small market for existing homes. A 2023 review by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT) compared the share of existing homes in all housing transactions: 14.5% in Japan in 2018, against 81.0% in the United States, 85.9% in the United Kingdom and 69.8% in France ◈ Strong Evidence [13]. Buyers expect new construction, lenders and appraisers price accordingly, and builders keep supplying it. Nomura Research Institute recorded 800,000 new housing starts in fiscal 2023 and forecasts 770,000 in fiscal 2030 and 580,000 in fiscal 2040 [4]. A country with a falling population still builds hundreds of thousands of new homes each year, while older ones quietly fall out of use. The new and the abandoned are two sides of the same market.

The third element is tax. Since 1973, residential land carrying a dwelling has benefited from a reduction in fixed asset tax: small plots of up to 200 square metres per dwelling are assessed at one-sixth of their value [11]. Demolish the house, and the land is reclassified and loses the reduction. Japan Property Central estimated that removing an abandoned house could raise the annual tax bill on the plot by three to six times [11]. Demolition itself costs money, often more than the land is worth in a declining area. The result is a perverse incentive: the cheapest option for an heir is to leave a deteriorating building in place, pay a small tax bill and do nothing [11] [16]. A rule written to make home ownership affordable in a growing country has become, in a shrinking one, a quiet subsidy for dereliction.

The fourth element is inheritance and registration. Until April 2024, registering inherited property was voluntary in Japan. Many heirs never did so, especially where the land had little value, and over successive generations ownership fragmented across dozens of relatives [10] [18]. A study group chaired by former internal affairs minister Hiroya Masuda estimated in 2017 that land whose owners could not be identified covered about 4.1 million hectares — more than the island of Kyushu — and could reach about 7.2 million hectares by 2040, close to the area of Hokkaido ◈ Strong Evidence [10]. When no one can be found to sign a sale contract or a demolition consent, a house cannot be sold, repaired or removed. It simply waits, and every year of waiting makes it harder to use and more expensive to clear.

Emotional and practical barriers compound the financial ones. Tomoko Kubo of the University of Tsukuba, who has studied akiya owners, found that many older adults reported never having discussed key matters such as the upkeep of the family home with their children [49]. Houses are left full of possessions, with family altars inside and graves nearby; the decision to sell or demolish is deferred until it falls to someone with no attachment and no local knowledge. Jeffrey Hall of Kanda University of International Studies notes that many of these houses are cut off from public transport, health care and even convenience stores [5] — which means that even a motivated seller may find no buyer. Akiya are produced not by neglect alone but by the absence of any moment at which a decision is forced.

Taken together, these elements form a system rather than a set of individual failures. A rapidly depreciating building, a buyer culture oriented to new construction, a tax code that penalises demolition and an inheritance regime that allowed ownership to dissolve into anonymity all point in the same direction ◈ Strong Evidence [10] [11] [12] [13]. Each rule made sense when Japan’s population was growing and land was scarce. In a country where the number of Japanese nationals is now falling by close to a million a year, the same rules turn houses into stranded assets. Reform has begun, and Section 5 examines how far it has reached. But the scale of the akiya problem is set less by these rules than by the demographic engine that feeds them, which is the subject of the next section.

The Ministry of Health, Labour and Welfare’s vital statistics for 2024 are stark. Births fell by 41,227 to 686,061, the first time below 700,000 since records began in 1899 [6] [7]. The total fertility rate fell from 1.20 to 1.15. Deaths reached 1,605,298, and the natural decline — deaths minus births — was 919,237, the 18th consecutive year in which it widened [6]. For comparison, Japanese births peaked at 2,696,638 in 1949 [6]. Prime Minister Shigeru Ishiba described the situation as a silent emergency [7]. The houses built for the large post-war cohorts and their children are now outliving the generation that filled them, and there are far fewer people in the generations behind to take them over.

The national population is following. Japan’s total population stood at 123,802,000 on 1 October 2024, down 550,000 in a year, and the number of Japanese nationals fell by about 890,000 through natural decline alone, the largest drop since comparable records began in 1950 [51]. The National Institute of Population and Social Security Research projects, in its 2023 medium-variant estimates, a population of about 104.7 million in 2050 and about 87 million in 2070 — roughly 30% below the 2020 level — with people aged 65 and over making up 38.7% of the total ◈ Strong Evidence [8]. Every one of those projected losses implies, eventually, a household that no longer needs a home. Japan’s housing stock is being sized for a population that will not exist.

Decline is not spread evenly. In April 2024 the Population Strategy Council, a private panel whose leadership includes Hiroya Masuda, classified 744 of Japan’s 1,729 municipalities — about 43% — as at risk of disappearing, defined as those where the number of women aged 20 to 39 is projected to fall by half or more between 2020 and 2050 ◈ Strong Evidence [9]. A 2014 report by a group Masuda led had named 896. The lower number is not evidence of recovery. The Institute for Social Vision Design notes that the improvement mainly reflects migration and growth in foreign residents rather than any demographic turnaround, and the council also identified 25 black-hole municipalities, including Tokyo’s 23 wards, which draw in young people but have very low fertility [9]. The capital absorbs the young adults whose departure empties the regions, and then does not replace them.

Internal migration intensifies the effect. In 2024 Tokyo recorded a net inflow of 79,285 people, about 11,000 more than the year before, and the wider Tokyo area gained 135,843 [24]. The largest net inflow was among people aged 20 to 24, at 86,908. Only six prefectures gained population through migration [24]. The pattern drains peripheral regions of exactly the age group that would otherwise form new households and occupy family homes. Each departing young adult leaves behind parents who will, in time, leave behind a house. The akiya map is a lagged image of the migration map, delayed by the 30 or 40 years it takes for the parents who stayed to age out of their homes.

Hall’s framing captures a point that discussions of akiya often miss. Japan does not have empty houses mainly because it built in the wrong places or in the wrong styles, though both happened. It has empty houses because the number of people is falling faster than the number of buildings ◈ Strong Evidence [5] [1]. Japan’s housing stock grew from 62.4 million in 2018 to 65.0 million in 2023 even as the population contracted [1]. As long as new construction continues at around 800,000 starts a year [4] and the population falls by several hundred thousand, the vacancy count rises almost mechanically. No akiya policy that focuses only on existing empty houses can change that underlying flow.

That arithmetic also explains why national averages understate local damage. A 13.8% vacancy rate might be manageable if empty houses were scattered evenly. They are not. In the 885 municipalities officially designated as depopulated, which together cover 63.2% of Japan’s land area, live only 9.3% of its people [38]. In such places a house does not stand empty among occupied neighbours; it stands among other empty houses, on a street with fewer shops, fewer buses and fewer people to notice when a roof gives way. What a national statistic records as a gradual rise in vacancy is, at street level, a sequence of thresholds being crossed. The next section looks at what that looks like on the ground.

Disaster risk is the most immediate concern. Japan is seismically active, and many vacant houses are older wooden structures. Yuki Akiyama warned in 2024 that when an earthquake or a tsunami occurs, there is a possibility that vacant houses will block evacuation routes as they break down and get destroyed [5]. Nomura’s estimate of 820,000 deteriorated vacant detached houses in 2023 [4] gives a sense of the scale: these are buildings that may collapse, shed roof tiles in typhoons, harbour pests or become fire risks, and whose owners may be impossible to reach [10] [14]. Municipal officials have the legal power to act, but as Section 5 shows, they have used it sparingly. In practice, the risk is carried by the neighbours who still live beside these buildings.

The ecological edge of depopulation is also advancing. In fiscal 2023, Japan recorded a then-record 219 people attacked by bears, six of whom died, with about 70% of incidents in the Tohoku region [39]. Fiscal 2025 was worse: by 20 November, 238 people had been injured or killed, including 13 deaths, with Akita prefecture alone accounting for 66 victims [40]. The immediate cause cited was a poor beech-nut harvest, and the evidence does not link individual attacks to individual empty houses [40]. But the South China Morning Post captured the wider pattern: humans are leaving rural areas, and bears are moving in [39]. Abandoned orchards, untended fields and empty homes remove the buffer of human activity that once kept wildlife at the forest edge.

The human side of this shows up in the depopulated municipalities’ own statistics. The 885 municipalities designated as kaso, or depopulated, represented 51.5% of all municipalities in 2022 and covered 238,675 square kilometres, but held only 11,668,630 people ✓ Established [38]. These are the places where schools close for lack of pupils, rural bus lines are cut and local shops shut — not as isolated events but as a continuing process [47] [48]. Every closure makes a further departure more likely and the arrival of a new family less likely, reinforcing the vacancy spiral from both ends. A house in such a town loses value not only because it is old but because the services that made it habitable are disappearing around it.

Nagoro, a hamlet in the mountains of Tokushima — the prefecture with Japan’s highest vacancy rate — became an international symbol of this process. Once home to about 300 people, it shrank to a few dozen residents, and local artist Tsukimi Ayano filled its streets and closed school with life-sized dolls standing in for neighbours who had died or moved away [42]. The school closed in 2012 after its last two pupils graduated [42]. Nagoro is often presented as a curiosity. It is better read as a preview: a place where the population fell below the level needed to sustain any public service, and where the houses outnumber, by a wide margin, the people available to live in them [1] [42]. Many smaller settlements in the 885 depopulated municipalities face the same arithmetic with far less attention [38].

Isolation is not only a rural phenomenon. In 2024 Japan’s National Police Agency, in its first tally of its kind, counted 76,020 people who died alone at home, 76.4% of them aged 65 or older; about 4,538 older people were not found for more than a month [41]. The largest numbers were in Tokyo and Osaka, not in remote villages [41]. The link to akiya is indirect but real: a house in which an elderly person lives alone is, statistically, a future vacant house, and when the occupant dies the property often passes to heirs who are distant in every sense [3] [49]. The vacancy statistics of 2033 are already living, alone, in the housing stock of 2026.

These effects do not register in a single national number. A vacancy rate is a ratio of buildings; the experience of depopulation is a loss of neighbours, services and the informal maintenance that a community performs simply by being present. Where that density falls below a threshold — enough children for a school, enough riders for a bus, enough households to keep a volunteer fire brigade staffed — decline becomes self-reinforcing ◈ Strong Evidence [9] [48]. Japanese policymakers have recognised this for at least a decade, and the legal tools available to them have expanded considerably since 2015. The next section examines what they have done with those tools, and how the results compare with the size of the problem.

The Act on Special Measures concerning Vacant Houses took full effect in May 2015. It allowed municipalities to designate specified vacant houses — buildings at risk of collapse or seriously harmful to their surroundings — and to issue advice, recommendations and orders to owners, withdraw the fixed asset tax reduction and, as a last resort, demolish the building by proxy at the owner’s expense [11] [14]. By 31 March 2025, municipalities had cumulatively issued 42,768 pieces of advice or guidance and 4,153 formal recommendations, and had carried out 878 demolitions or similar measures by proxy, including cases in which no owner could be identified ✓ Established [14]. Earlier MLIT data showed that by March 2023, 83% of municipalities had adopted vacant-house plans [53]. The law gave local government a procedure where before there had been almost none.

A 2023 amendment, effective that December, widened the net. Municipalities can now act on poorly managed vacant houses — buildings likely to become dangerous if left alone — and a formal recommendation strips the land tax reduction before a house reaches the danger stage [16]. The amendment also created promotion zones for vacant-house use, designated support corporations and an emergency demolition procedure [16]. In the first months, to March 2024, guidance had been issued on 1,091 such houses [15]; by March 2025, municipalities had issued guidance on 3,211 poorly managed houses and recommendations on 378, designated four promotion zones and appointed 95 support corporations [14]. In parallel, mandatory inheritance registration began in April 2024 [18], and a system introduced in 2023 lets heirs hand unwanted land to the state for a fee [17]. The timeline below sets these measures against the longer history of the problem.

Measured against the size of the problem, the enforcement record is modest. The 878 proxy demolitions and related measures over roughly a decade compare with 3,856,000 abandoned homes and 820,000 already deteriorated detached houses [1] [4] [14]. Proxy demolition is slow and expensive for municipalities, which must pursue owners for costs that are often unrecoverable, and which frequently lack the staff to trace heirs through generations of unregistered inheritance [10]. The early numbers under the 2023 amendment are similarly small: 378 recommendations nationwide by March 2025, and only four promotion zones designated [14]. The legal architecture now covers the full life cycle of an empty house. The administrative capacity to use it at scale does not yet exist ◈ Strong Evidence [14] [49].

Inheritance reform addresses the root of the ownership problem rather than its symptoms. Since 1 April 2024, heirs must register inherited real estate within three years of learning of the inheritance, with a non-criminal fine of up to ¥100,000 for failure without good reason; the obligation also applies to earlier inheritances, with a deadline of 31 March 2027 [18]. The 2023 land-relinquishment system lets heirs transfer unwanted land to the state. As of 31 August 2026, the Ministry of Justice reported 5,997 applications and 3,119 completed transfers, of which 1,164 were residential plots, while 1,139 applications had been withdrawn [17]. The scheme works, but at a scale of thousands against a problem of millions, and it excludes land that still carries a building — the akiya itself must be demolished first [17].

Demand-side policies try to bring people back. The relocation support grant pays households that move from the Tokyo area to regional municipalities, and from April 2023 the child supplement was raised from up to ¥300,000 to up to ¥1 million per child [22]. The regional revitalisation corps, Chiiki Okoshi Kyoryokutai, placed 7,910 members in 1,176 municipalities in fiscal 2024, and about 70% stayed in the region after their term, many of them to start businesses [23]. On the supply side, 1,052 of 1,788 local governments take part in the national akiya bank portals, which by April 2024 carried 15,046 listings and had recorded about 17,100 cumulative sales ◈ Strong Evidence [19]. Each of these programmes matters locally. None operates at the scale of national decline, as the assessment below sets out.

The most significant shift may be conceptual rather than legal. The Basic Concept for Regional Revitalisation 2.0, approved by the Ishiba cabinet in June 2025, states that it starts from squarely accepting that the population and the working-age population will continue to decline for the time being [26]. The original 2014 strategy had aimed to halt the decline. The new plan sets targets such as 10 million people with continuing ties to regions they do not live in, and seeks regions that young people and women will also choose ◈ Strong Evidence [25] [26]. That shift — from reversing shrinkage to living with it — is where the international comparisons in the next section become instructive, because several other countries made the same transition earlier.

South Korea is following Japan’s path at greater speed. Its total fertility rate fell to 0.72 in 2023, the lowest since national records began in 1970, with only about 230,000 births [30]. Vacant homes reached 1.53 million at the end of 2023, according to the Korea Research Institute for Construction Policy, up 5.7% from 2022 and 43.6% from 1.07 million in 2015 [29]. The institute warned that long-neglected houses can lead to neighbourhood deterioration and urban slum development, and may become hot spots for crime [29]. With fertility far below Japan’s 1.15 [6], Korea’s vacancy curve is likely to steepen faster than Japan’s did, from a later starting point and with fewer years to adapt its institutions.

Italy shows a different mix of causes. Its statistical institute ISTAT counts about 9.5 million dwellings that are unoccupied or used only by non-residents, out of 35.6 million — 27.3% of the stock, though the figure includes holiday homes and is not directly comparable with Japan’s abandoned category [31]. Rural Sicily popularised the one-euro house: since 2008, towns have sold derelict homes for a token price on condition that buyers renovate them within about three years. Mussomeli, which lost about 30% of its 15,000 residents, has found new owners for about 400 houses since 2017 [32]. The model brings publicity, foreign buyers and some genuine renovation, but the numbers involved are small compared with the scale of vacancy across the Italian interior.

Eastern Germany chose demolition. After reunification, mass migration westward left around 1.4 million of 7.4 million apartments in the former East vacant by the mid-2000s. The federal Stadtumbau Ost programme spent more than €2.5 billion to demolish over 300,000 units, while upgrading the remaining stock ◈ Strong Evidence [33]. Detroit followed a similar logic at city scale: about 27,000 abandoned houses have been demolished since 2014, funded first by $265 million from the federal Hardest Hit Fund and then by a $250 million municipal bond, while around 19,000 vacant homes were sold for renovation [34]. Both cases show that planned contraction is possible. Both also show that it costs serious public money and requires a central decision that some buildings, and some blocks, will not return.

China and the Iberian peninsula illustrate other variants. In China, the problem is construction ahead of demand rather than inherited houses; He Keng, a former deputy head of the National Bureau of Statistics, said in 2023 that 1.4 billion people probably cannot fill the country’s vacant homes [35]. In Spain, 4,982 municipalities — about 60% of the total — had fewer than 1,000 inhabitants in 2024, covering 40% of the land but holding 3.1% of the population [36]. Portugal’s 2021 census counted 723,215 vacant homes, 12.1% of the stock, concentrated in high-demand cities such as Lisbon and Porto as well as the interior [37]. Vacancy, in other words, can coexist with housing shortage when the houses are in the wrong places.

The tax route is the newest for Japan. Kyoto obtained national approval in March 2023 for a tax on non-resident housing, the first of its kind in the country, covering about 15,000 homes and expected to raise about ¥950 million a year [27]. Low-value houses and traditional machiya townhouses are exempt. The start, originally planned for 2026 at the earliest, has since been pushed back to fiscal 2030 because of system development needs, according to the Institute for Social Vision Design [28]. Kyoto is a high-demand city where empty homes coexist with housing pressure — closer to Lisbon or Porto than to Nagoro [37]. A tax works where there is latent demand to release; in places with none, it would only add a cost to an asset that already has no buyer.

The comparative lesson is that depopulation-driven vacancy has no cheap solution. The places that reduced it substantially did so through demolition funded at national or city level — Germany’s more than €2.5 billion, Detroit’s more than half a billion dollars [33] [34] — or through demand returning, as in the most attractive Italian towns [32]. Japan’s problem is larger in absolute terms than any of these cases, more geographically dispersed and, because of its inheritance and tax rules, more legally entangled ◈ Strong Evidence [10] [11]. Nor is there agreement inside Japan on whether the answer lies in filling empty houses or in planning their removal. Those disagreements are the subject of the next section.

The optimistic case has a respectable origin. Munekatsu Ota, then head of the home-sharing company Rakuten Lifull Stay, told Bloomberg in 2018 that these abandoned homes are toxic assets — costly to maintain or to tear down — but that a simple renovation could turn them into moneymakers [43]. International coverage of houses offered for a token sum has drawn interest from foreign buyers in particular [44]. The regional revitalisation corps shows that some newcomers stay and build businesses: of those who remained after their term, 46.4% started one [23]. Okutama, in western Tokyo, offers renovation subsidies to young families who commit to settling permanently in its akiya ◈ Strong Evidence [21]. For a well-located house with a willing seller, the opportunity is real.

The sceptical case comes from those who work on renovation. Hana Sakata of New Heritage, which restores traditional houses, warned in 2024 that there is a lot of hype, particularly among foreigners, about farmhouses available very cheaply or free, but that renovation is a huge commitment and few contractors can do the work because traditional carpentry skills are dying out [44]. Many akiya are in places without jobs, transport or services [5], and the structural condition of older wooden houses often makes rebuilding cheaper than repair [12]. From this angle, the opportunity story concerns a small and attractive fraction of the stock, not the millions of houses that make up the abandoned core ⚖ Contested [44] [1].

The Toyama case sits at the centre of the planning debate. The city reorganised around a light-rail network to concentrate residents and services; a case study for the Global Infrastructure Hub reports weekday ridership up about 210% and holiday ridership up about 370% on the converted line, with roughly 12% of users switching from cars [46]. Yet a RIETI discussion paper by Shinichiro Iwata and Keisuke Kondo concluded that the current framework of the Toyama compact city model does not produce the expected results for retail revitalisation ⚖ Contested [45]. Compact-city policy can improve transport and slow sprawl. Whether it can redistribute a shrinking population in a way that keeps town centres alive — and so give empty houses near the centre a second life — remains contested.

A second dispute concerns migration incentives. A 2020 Nippon.com analysis of regional policy under Shinzo Abe concluded that none of these measures has been able to stem population drain from countryside to cities, stagnating fertility rates or depopulation, and described the hometown tax donation system as producing beggar-thy-neighbour competition among municipalities [47]. The Institute for Social Vision Design notes that the government itself identified inter-municipal competition for population as a failure of the first decade of regional revitalisation ⚖ Contested [48]. Supporters of the grants reply that they were never meant to reverse national decline, only to rebalance it toward regions with the capacity to absorb newcomers. Both claims can be true at once.

The deepest disagreement concerns whether some places should be helped to close. Naoki Hayashi of Kanazawa University has argued, in books on rural planning, for strategic withdrawal and the planned consolidation of settlements — a forward-looking reduction that keeps several possible futures open [50]. Others resist the idea that any community should be written off. Regional Revitalisation 2.0 sits uneasily between these positions: it accepts decline as the starting point, while still aiming for regions that young people and women choose to live in [26]. Hayashi’s approach has a clear logic for infrastructure costs; it is politically difficult, because it asks residents to accept that their village has no long-term future ⚖ Contested [9] [50].

A final dispute is about the headline number itself. Critics of alarmist coverage point out that roughly half of the 9 million are rental vacancies, and that the total includes second homes and properties on the market [1] [44]. They are right that 9 million overstates the abandoned stock. But the core category of 3.86 million is the fastest-growing part of the total, and Nomura’s projections point to further growth [3] [4]. The debate is therefore less about whether the problem is real than about which houses can still be saved, who should pay for the rest, and who should decide which communities receive investment and which are allowed to thin out.

The first conclusion is about cause. The vacancy count rises because the population falls while construction continues, not because of any single policy error ✓ Established [1] [4] [6]. With deaths exceeding births by more than 900,000 a year and housing starts still around 800,000, the gap between buildings and people will widen through the 2030s whatever the details of akiya policy. Expecting relocation grants or akiya banks to reverse that trend misreads the arithmetic [19] [22]. They can redirect a share of a shrinking flow of people; they cannot enlarge it. Any serious assessment of akiya policy has to start from that constraint rather than treat it as background.

The second conclusion is about mechanism. The akiya stock is shaped by specific, changeable rules: the fixed asset tax reduction that rewards leaving buildings standing, depreciation conventions that write houses down to nothing in about two decades, a small market for existing homes and, until 2024, voluntary registration of inherited property [11] [12] [13] [18]. Reforms since 2015 have begun to address each of these, which is why the period to 31 March 2027 — when the registration deadline for older inheritances falls due — matters. Clear ownership is the precondition for every other remedy, from sale to demolition ◈ Strong Evidence [10] [18]. Without a traceable owner, no market or municipality can act.

The third conclusion is about scale. Every policy instrument examined here operates in the thousands or tens of thousands: 878 proxy demolitions, 3,119 land transfers to the state, about 17,100 akiya bank sales, 7,910 regional revitalisation corps members [14] [17] [19] [23]. The abandoned stock is measured in millions. Closing that gap would require either national funding for demolition on the German or Detroit model, or an explicit decision to let large numbers of houses decay where no one is affected [33] [34]. Both are choices with costs. Leaving the matter to individual heirs, as Japan largely does today, is also a choice — one whose costs fall on neighbours and municipalities.

The fourth conclusion concerns geography. The problem is concentrated where vacancy rates exceed 20% — Tokushima, Wakayama, Kagoshima, Yamanashi, Kochi and Nagano — and in the depopulated municipalities that cover most of Japan’s land [1] [38]. In high-demand cities such as Kyoto and Tokyo, vacancy is largely a market problem that taxation and better information can address [27] [28] [52]. In declining rural areas it is a settlement problem, which no housing policy alone can solve. Treating both with the same instruments explains much of the gap between policy ambition and results, and suggests that national akiya policy should distinguish more sharply between the two.

The fifth conclusion concerns people. The human cost of akiya falls on those who remain: older residents in places where services contract, neighbours exposed to collapsing buildings, communities where the informal work of mutual care becomes harder to sustain [5] [41] [49]. Tomoko Kubo’s finding that many older owners have never discussed the future of their homes with their children points to a low-cost intervention that policy has largely overlooked: earlier family planning of inheritance, supported by local governments before a house becomes vacant ◈ Strong Evidence [49]. A house is far easier to sell, let or demolish while its owner is alive and able to decide than after it has passed to scattered heirs.

Japan is not unique, only early. South Korea’s fertility rate of 0.72 in 2023 and its 1.53 million vacant homes, Italy’s millions of unoccupied dwellings and rural Spain’s emptying municipalities suggest that other countries will face similar choices within a generation [29] [30] [31] [36]. What Japan does with its 9 million empty homes — whether it continues to treat them as isolated failures or begins to plan deliberately for a smaller country — will be studied well beyond its borders. The houses are the visible part of the story. The decision about which communities to sustain is the part still to be written [1] [26].