Global Reference Hub
Every city that legalized the multiplex — and what actually happened
Across three continents, governments handed ordinary single-family lots the right to become three, four, six, even ten homes. This hub profiles 24 of those reforms in detail — the rules, the dates, the real permit numbers, and the lawsuits and repeals. The pattern is blunt: legalizing density is the easy part. Building the homes is not.
What 24 reforms teach in three lines
It can work
Auckland added ~21,808 homes in five years and cut 3-bed rents 26–33%. Tokyo's stock nearly tripled since 1963. Done at scale, upzoning builds homes and softens rents.
Permission isn't production
California SB 9 was modeled for ~700,000 homes and delivered 266 projects. Sacramento built zero mid-size projects in 18 months. The math, not the map, decides what gets built.
Durability is fragile
Calgary repealed its rezoning in 2026. Gainesville reversed in months. Arlington is void in court. New Zealand made its mandate optional. Reforms can be unwound before they pay off.
United States
The first big US city to end single-family-only zoning — then defend it in court.
The first US state to effectively end exclusive single-family zoning.
Called 'the best low-density zoning reform in US history' — with the data to back it.
Projected to unlock ~700,000 homes. Delivered 266 projects in two years.
A mandatory, transit-tiered upzone that bans parking minimums near frequent transit.
Backyard cottages now out-permit new houses two to one.
No zoning, one rule change, ~80,000 new homes.
436 homes from the three-unit rule; just 8 from the small-lot rule.
The same appeals panel reversed itself in about two weeks.
Poised to be Florida's first city to end single-family zoning — undone by an election.
First California city to allow multi-unit housing in every neighborhood — and built zero 3-to-20-unit projects in 18 months.
The city that invented single-family zoning in 1916 legalized middle housing in 2025.
Canada
A province forcing 3–6 homes onto single-family lots by statute — the model for this whole site.
Six strata homes or eight rental homes on a standard lot — VanPlex's home market.
Three units provincewide, four in Toronto — but the city balked at six.
Eight units on a mid-block lot — the most permissive blanket zone of any major Canadian city.
Canada's blanket-upzoning reversal: adopted 2024, repealed 2026.
Four units on every serviced lot — no rezoning, no hearing, no agreement.
International
The world's best evidence that upzoning lowers rents — and it's peer-reviewed.
A national by-right upzone — then a national walk-back.
Even the most restrictive residential zone allows small apartments — by design.
A by-right 800-metre radius around 171 town centres and stations.
Meet the standards near a station and you skip the objections.
The cautionary counter-case: by-right conversions, but a documented quality backlash.
Want them all in one table?
The Global Scorecard ranks every reform on ambition, real uptake, and durability — so you can see at a glance which legalizations turned into housing and which became cautionary tales.
Open the Global Scorecard →Questions people ask
Which city has the best multiplex zoning reform?
On the evidence, Auckland, New Zealand. Its 2016 upzoning is the most-studied on Earth and peer-reviewed work found it added about 21,808 homes in five years and lowered 3-bedroom rents 26–33%. Portland and Japan are the other standouts for measurable, durable results.
Did any city repeal its multiplex zoning?
Yes. Calgary repealed its 2024 citywide rezoning in April 2026, and Gainesville, Florida reversed its reform within months in 2023. Arlington, Virginia is void pending a court rehearing, and New Zealand made its national mandate optional after a 2023 election.
Does legalizing more units actually produce housing?
Not by itself. California SB 9 was modeled to make ~700,000 homes feasible but produced 266 projects in two years, and Sacramento built zero 3-to-20-unit projects in its first 18 months. Legalization is necessary but not sufficient — financing, construction cost and design limits decide what gets built.
How does BC compare to the rest of the world?
BC's Bill 44 is among the most ambitious mandates anywhere — a province forcing 3 to 6 homes onto single-family lots, scaled by transit, with no city opt-out. It most resembles Washington's HB 1110 and New Zealand's MDRS. The open question is durability and real uptake, which is exactly what these other cities reveal.
See What Your Own Lot Can Do
These reforms are global. The opportunity is local. Enter any BC address to see the units your lot is zoned for and whether the project actually pencils.