Apr 4, 2026
For years, the housing debate in America has sounded like a broken record: prices are too high, inventory is too low, and first-time buyers are getting squeezed out. Portland, Oregon, decided to stop arguing about it and start changing the math.
Instead of protecting single-family neighborhoods at all costs, the city quietly rewrote the rules: allowing fourplexes, backyard homes, cottage clusters and even six-unit buildings on lots that once held just one house (1). The goal wasn’t just to legalize these homes, but to make them financially viable to build — something most cities struggle to accomplish.
Portland didn’t just allow density — it made it profitable
Plenty of cities have flirted with the idea of so-called “infill” or “middle housing,” the space between a single-family home and a large apartment building. Portland pushed further by redesigning its zoning code to reward developers who build multiple units.
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The key lever was something most buyers never think about: square footage limits tied to lot size. Under Portland’s updated rules (2), a single-family home is capped at a smaller size, while developers can build significantly more total square footage if they divide that space into multiple units.
That shift changes the economics quickly. A builder can generate more revenue from several smaller homes than from one large one, which creates a clear incentive to actually construct them.
The results have been noticeable. In the first year after the policy took effect in 2021, nearly 9 in 10 new permits were for these denser housing types, rather than traditional single-family homes (3). Over three years, Portland approved roughly 1,400 of these units, according to the city.
For buyers, the appeal is straightforward: smaller homes cost less. In some cases, these units have sold for hundreds of thousands of dollars less than nearby single-family houses – creating a version of a starter home that isn’t a fixer-upper or a condo with steep fees.
“I could afford a much higher-quality house as a first-time home buyer,” Laurel Moffat, who bought a 900-square-foot duplex built in the backyard of another home, told The Washington Post (4). “For a new build, that wasn’t possible except for these infill homes.”
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Why other cities struggle to replicate it
On paper, Portland’s approach sounds simple: allow more housing, prices come down. In practice, it’s more complicated.
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Other cities have experimented with reforming zoning rules or outright banning single-family zoning, which Minneapolis did in 2018 (5). But that city’s specific reform allowing duplexes and triplexes on single-family lots has produced only modest infill so far. Without complementary changes to building standards and financial feasibility, developers have been slow and have continued to focus on larger or more conventional builds.
“We’ve been pretty underwhelmed at the number of triplexes that have been built as a result of our code changes because I think developers have not quite figured out how to make those financially feasible yet.” Meg McMahan, Planning Director for the city, told CET (6), a PBS-affiliated news outlet in Cincinnati.
Portland’s model works, supporters say, because it aligns zoning, economics and political will.
“We are leading the nation in new starter homes,” Portland resident and zoning consulting Neil Heller told The Washington Post (7). “Where most people don’t see starter homes at all and it’s an extinct species, we are reviving them here.”
Does this actually make housing affordable?
The median home price in the U.S. is still hovering around $405,000, according to Federal Reserve data (8), and in many West Coast markets it’s significantly higher.
Portland’s changes alone aren’t likely to significantly reverse the trend, but it has created more entry points for buyers who might have been locked out of the market at $500,000 or $600,000.
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Options in the city now exist in the $300,000 to $400,000 range, particularly for smaller or attached homes.
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Should buyers expect this to come to their city?
Widespread adoption of rules like Portland’s will likely take years, and results will vary depending on local politics and market conditions.
For buyers, waiting for zoning reform to solve affordability may not be a reliable strategy. A more practical approach is to focus on what’s available now.
That could mean expanding the search to include townhomes, duplexes or smaller properties, even in markets that haven’t fully embraced Portland’s model. It may also require adjusting expectations around size, location or amenities.
Budget discipline matters just as much. Building a larger down payment, improving credit and exploring first-time buyer programs can make a meaningful difference in affordability, regardless of housing policy.
Article sources
We rely only on vetted sources and credible third-party reporting. For details, see our editorial ethics and guidelines.
The Washington Post (1, 4, 7); Portland (2, 3); The Century Foundation (5); CET (6); Federal Reserve Bank of St. Louis (8)
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Chris Clark is a Kansas City–based freelance contributor for Moneywise, where he writes about the real financial choices facing everyday Americans—from saving for retirement to navigating housing and debt.
