Japan (national): City Planning Act — cumulative use zones

Japan does something most countries do not: it writes the rules of zoning once, at the national level, and applies the same rulebook to every city. The legal backbone is the City Planning Act, first passed in 1968, which sets out the zone categories a city may use. A second national law, the Building Standards Act, then fixes the technical limits inside each zone, such as how tall a building may be and how much floor area it may hold. The City Planning Act decides which zone a piece of land falls into; the Building Standards Act decides what you may build there.

The reason the system is centralised traces back to the post-war decades, when Japan rebuilt and grew at enormous speed and needed a planning framework that worked the same way in every prefecture. The practical effect is that a builder in Osaka and a builder in Sendai are reading the same definitions of what a 'low-rise residential zone' or a 'commercial zone' permits. Local councils are not free to invent their own categories. This matters for the rest of the story, because it strips away one of the biggest sources of delay and uncertainty in housing: the chance that every town interprets density differently and that neighbours can renegotiate the rules building by building. In Japan the categories are settled in advance, in national law, for the whole country.

The single most important feature of Japanese zoning is that it is cumulative, or 'inclusive', rather than exclusive. Each zone is defined by the most intense, most disruptive use it will tolerate. Everything quieter and less disruptive than that ceiling stays permitted automatically. As one widely cited explainer of the system puts it, Japanese zoning is inclusive because 'every use that is considered to be less of a nuisance is still allowed' once you move up the ladder of zones. So housing, the quietest use, is permitted in nearly every zone in the country.

Contrast this with the North American pattern, where a zone labelled 'single-family residential' means single-family homes and almost nothing else. There, an apartment is not a quieter version of a house that is automatically allowed; it is a separate use that must be specifically permitted, and usually is not. Japan inverts that logic. Because residential use sits at the calm end of the nuisance scale, the Greater London Authority's research on the system notes that in Japan 'housing can be built in almost any zone'. A factory cannot be dropped into a quiet residential street, but a home, a shop on the ground floor, or a small apartment building generally can go almost anywhere.

The consequence is that Japan never created large tracts of land where multi-unit housing is simply illegal. The map of what you may build is graded by intensity, not carved into exclusive single-use enclaves. That design choice, made once in national law, is the reason Japanese cities can keep adding homes inside their existing footprint without first having to win a fight to legalise apartments parcel by parcel.

The clearest proof of how permissive the system is sits in its most restrictive category. The City Planning Act lists the 'category 1 low-rise exclusive residential districts' as the first and tightest of its use districts. You might expect 'exclusively low-rise residential' to mean detached houses only, as a comparable label would in Canada or the United States. It does not. Even in this zone, small low-rise apartment buildings and other collective housing are permitted alongside detached homes. A guide drawn from the Japanese rules describes the category 1 low-rise zone as 'a low-rise building area where the majority of properties are single standing houses and low-rise apartments'. Apartments are not an exception that needs special permission; they are a normal, expected building form in the strictest residential zone Japan has.

What keeps the zone low-rise is not a ban on multiple units but a hard cap on height and bulk. In the category 1 low-rise residential zone, buildings are held under an absolute height limit of 10 or 12 metres, with the exact figure chosen locally. Within that height ceiling, the Building Standards Act controls density through two further dials that local governments set inside nationally fixed ranges: the building coverage ratio, the share of the lot the building may cover, and the floor area ratio, the total floor space allowed relative to lot size. For low-rise residential land these typically run from a building coverage ratio of 30 to 60 percent and a floor area ratio of 50 to 200 percent. In practical terms that produces buildings of roughly one to three storeys. The result is a streetscape that looks low and calm but quietly contains duplexes, triplexes, and small apartment blocks mixed in among the houses — the form Canadian cities are only now trying to legalise.

The division of power between the national government and local councils is precise, and it is what limits the ability of neighbours to block housing. The national Ministry of Land, Infrastructure, Transport and Tourism, known as MLIT, defines the zone categories and dictates what each one permits. Local governments enforce those rules but cannot rewrite them: as one summary of the framework puts it, 'National zoning regulations are set by the national government, the Ministry of Land, Infrastructure, Transport and Tourism (MLIT), whereas local governments and local municipalities enforce them.'

What a city does control is where to draw the zones on the map, and where within the national ranges to set the local height, coverage, and floor area limits. The explainer of the system describes it as 'a national law, not a municipal by-law', where the law is adopted nationally but 'its local application is left to city governments, as long as they respect the national law'. A city can decide that a district is low-rise residential. It cannot decide that low-rise residential means no apartments, because that definition is fixed in national law and apartments are in it.

This is the structural reason organised opposition to new housing has far less to grip onto in Japan. Because the categories and what they permit are national, residents cannot lobby their council to redefine a zone so that the multiplex next door becomes illegal. The lever simply is not at the local level. The City Planning Act counts twelve use districts in its core list; a thirteenth, a 'Countryside Residential Zone' added in 2018 to protect farmland while still allowing low-rise homes, is why some recent sources count thirteen rather than twelve.

The mechanism that turns these permissive rules into actual homes is as-of-right approval. If a proposed building fits the written rules of its zone — the permitted uses, the height cap, the coverage and floor area limits — it is approved. There is no discretionary review where a council, a hearing, or a neighbourhood objection can stop a compliant project. The Greater London Authority's analysis of Japan stresses exactly this: a project that complies with zoning 'doesn't need to go through a discretionary review process', which gives developers and residents alike 'a high degree of certainty about what can and cannot be built'.

Certainty is the quiet superpower of this design. A builder who buys a lot in a residential zone already knows what is allowed, can price the project accordingly, and faces no risk that a multi-year approval fight will kill the economics. The flip side is that neighbours know it too: they can see from the national rules what could be built next door, so there is little to litigate. The same analysis quotes a University of Tokyo planning scholar describing the bottom line for local opposition starkly — in this system, 'local government has almost no power over development' once a proposal meets the national rules. That is the opposite of the case-by-case, hearing-driven approach common in Canadian cities, and it is the difference that shows up in the construction numbers.

The payoff of permissive, by-right zoning is visible in raw output. In 2014 the city of Tokyo, with a population of about 13.3 million, recorded 142,417 housing starts — more than the 137,010 homes started in the entire country of England, and more than double the 83,657 housing permits issued in the state of California, despite California's far larger population. Those figures, reported by Robin Harding of the Financial Times, capture the scale plainly: a single Japanese city out-built an entire nation and an entire large American state in the same year.

This is not a one-year fluke. Over the two decades from 1995 to 2015, Tokyo averaged about 155,000 new homes each year, compared with roughly 21,000 per year in the San Francisco Bay Area over the same period, according to the San Francisco planning research group SPUR. Stretch the lens further and the cumulative effect is striking: SPUR records that Tokyo's net housing stock nearly tripled between 1963 and 2013, rising from 2.51 million homes to 7.36 million. By comparison, the Greater London Authority's research found that over a similar span since 1963, the housing stock of London, New York, and Paris each grew only by roughly 20 to 30 percent. Same decades, same global pressures on big cities, dramatically different output. Tokyo kept building, and the others largely did not.

The reason these numbers are the centre of Japan's reputation is that they connect cause to effect cleanly. Permissive national zoning that legalises apartments almost everywhere, plus as-of-right approval that removes the discretionary veto, produces a city that adds homes by the hundred-thousand year after year. The supply does not have to fight its way past a hearing each time.

It would be a mistake to present Japan as a place where housing costs never move. They do. Tokyo rents have risen in recent years as people keep concentrating in the capital, and the city is not somehow exempt from the basic pressure of demand. The accurate claim is comparative, not absolute: Tokyo's housing costs have stayed far more stable than those of peer global cities precisely because supply has been allowed to respond. The heavy, sustained building documented by SPUR and the Greater London Authority is what kept prices and rents from climbing the way they did in London, New York, Paris, or San Francisco — not a magic ceiling that holds them flat forever.

There is also an important demographic backdrop. Japan's national population has been shrinking and ageing for years, which eases housing pressure in much of the country even as Tokyo itself continues to draw people in. Some of Tokyo's room to keep building comes from the broader national context, and a country with a fast-growing population would face stronger demand against the same supply. Honesty about this matters: Japan's zoning system is a powerful supply engine, but it operates inside a country whose total population is no longer rising. The lesson to draw is about the supply mechanics — permissive rules, by-right approval — not a claim that any city copying them would see prices never rise.

For British Columbia, Japan is the long-run benchmark for a path the province has just started down. Until recently, getting more than a single house or a duplex onto a typical BC residential lot usually meant a rezoning: a discretionary, case-by-case process in which a council vote and a public hearing could approve, reshape, or reject a project. BC's own housing ministry acknowledged the cost of that model, noting that public hearings can slow approvals for new homes, delaying construction and adding costs. That is exactly the discretionary, hearing-driven approach Japan does not use for compliant projects.

The province's response, the Housing Statutes (Residential Development) Amendment Act, 2023, known as Bill 44, moves BC a step toward the Japanese model. It requires most local governments to permit small-scale multi-unit housing — generally three to four units, and up to six on larger lots near frequent transit — on land previously zoned for single houses, and it removes the requirement for a public hearing on projects that already match the community plan. In plain terms, BC is starting to do what Japan does: write the permission for more homes into the rules in advance, so that a fitting project does not need to win a separate fight each time.

Japan shows what that approach can deliver if it is held to over decades. The gains are not instant. Tokyo's near-tripling of its housing stock took fifty years of consistently permissive, by-right rules, not a single reform. The takeaway for BC is patience plus consistency: the payoff from making more homes legal as-of-right, and from taking the case-by-case objection out of compliant projects, compounds over a long horizon. Bill 44 is an early move in that direction; Japan is the evidence that staying the course on permissive, predictable, by-right zoning is what eventually changes how much housing a city can build.