Upzone further, as of right
Extend what can be built without a rezoning application past today's four-unit rule: six-plexes, mid-block rowhouses, more mid-rise near transit. This is where every "missing middle" platform points. Check what is already legal first: four units per lot citywide since 2023, and 45-storey approvals near transit since 2024. A candidate promising to "legalize fourplexes" is promising 2023.
THE EVIDENCE, THE COSTS, WHO DECIDES▾
- The case is about certainty and land price, not just permission counts. London's paper pipeline is huge, 51,434 approvals since 2022 against a best year of 3,723 starts, which says case-by-case approval is not the only bottleneck. As-of-right rules aim at the cost and risk of the process itself, letting small projects skip the hearing-by-hearing route entirely. city release (Feb. 2026) ↗
- Auckland is the strongest measured case. After the 2016 Unitary Plan upzoned roughly three-quarters of residential land, a peer-reviewed study counted 21,808 additional dwellings permitted over the following five years, about 4.11% of the region's housing stock. Greenaway-McGrevy & Phillips, Journal of Urban Economics (2023, peer-reviewed) ↗
- On Auckland rents, a follow-up study — a working paper, not yet peer-reviewed, carried here with that label — estimates three-bedroom rents six years in were 26 to 33% below where a synthetic comparison says they would otherwise have sat. Greenaway-McGrevy, U. of Auckland Economic Policy Centre working paper 016 ↗
- Minneapolis, 2017 to 2022: the housing stock grew 12% while rents rose 1%; the rest of Minnesota grew its stock 4% while rents rose 14%. The honest caveat, which the same source concedes: the gains came mostly from apartment and parking reforms, not the famous triplex legalization — that change itself had produced only 72 duplexes and 37 triplexes by late 2023. Pew Charitable Trusts (Jan. 2024, pro-supply lean) ↗
- Edmonton's citywide rezoning is the nearest Canadian test: 16,519 units approved in year one, up 30%, with row housing jumping from an average of about 146 units a year to 1,216. Taproot Edmonton ↗
- Uptake is slow everywhere it is measured, and London has published no count of fourplexes actually built since the 2023 change. Zoned capacity is not built units: London missed its own intensification target by half in 2022, 20.8% achieved against a 45% target. CTV News (Feb. 2023) ↗
- Edmonton's own numbers carry the limits: for all the approvals, only 0.2% of eligible residential properties actually redeveloped in the first two years of the reform. independent two-year review of Edmonton's rezoning (pro-housing lean) ↗
- The politics stay live after passage: a mid-2025 Edmonton push to cut mid-block infill from eight units to six failed by one vote, 6 to 5, with design restrictions added instead. The neighbourhood-side critique, parking, character, infrastructure load, is the same one London's own station-area process drew repeatedly, and every approval stage removed is also a public objection stage removed. CBC Edmonton ↗
- New supply rents at the top of the market first, and the evidence on how fast relief reaches cheaper units cuts both ways. The classic peer-reviewed estimate says rental housing filters down-income at about 2.5% a year — decades, not a council term. That is why "upzoning" and "affordable housing" are different promises. Rosenthal, American Economic Review (2014, peer-reviewed) ↗
- The counter-estimate, also peer-reviewed, says the chain of moves runs faster: every 100 new market-rate units lead 45 to 70 people to move out of below-median-income neighbourhoods, with almost all of the effect inside five years. Mast, Journal of Urban Economics (2023, peer-reviewed) ↗
- Scale matters to the whole case: a Chicago study of small, parcel-by-parcel upzonings near transit found property values rose and no additional homes were permitted within five years. It is usually cited as why broad reform can work where parcel tweaks don't — and it is a warning about half-measures either way. Freemark, Urban Affairs Review (2020, peer-reviewed) ↗
- Auckland itself is contested: a supply-skeptic economist argues the study's comparison assumes consent growth would otherwise have stalled, and that "stockpiling pieces of paper with approval to build (consents) does not grow the stock." Permits are not homes, in Auckland or in London. Cameron Murray, Fresh Economic Thinking (supply-skeptic lean) ↗
- London itself is the nearest test: four units per lot legal since August 2023, uptake unpublished three years later. The absence of a count is the current state of the evidence. london.ca — More Homes ↗
Not derivable, and the absence is the finding: council changed the rules in 2023 and does not publish what the change built, so no honest projection of the next increment exists. The checkable ask is the count itself: permits and completions under the four-unit rule, published.