Why Housing Is So Expensive

Housing is expensive because demand for well-located homes keeps growing while the legal, physical, and financial systems that produce new homes cannot keep pace. In 2024, U.S. home sales fell to their lowest level in thirty years even as the median home price hit $412,500, according to the Harvard Joint Center for Housing Studies' 2025 State of the Nation's Housing report. That is not a market working normally. It is a market where restrictive zoning, high interest rates, rising construction costs, and stagnant wages have all pushed in the same direction at once, and understanding each piece separately is the only way to see why the whole system feels stuck.

The short answer, and why it is not one cause

Ask five economists why housing costs so much and you will get five overlapping answers: not enough land is zoned for dense construction, mortgage rates make buying expensive even when prices are flat, builders face labor and material shortages, and incomes have not kept pace with home values. All five are correct at the same time. Housing affordability is not a single-variable problem, which is exactly why it resists single-variable solutions like "just build more" or "just lower rates."

Economists Edward Glaeser and Joseph Gyourko have spent two decades documenting how land-use regulation, not physical land scarcity, drives most of the price gap between cheap and expensive American metros. Their research estimates that regulatory barriers add anywhere from $100,000 to $400,000 to the cost of a home in the most restrictive markets, compared to what the same home would cost if it were built under looser rules (Wharton Zell/Lurie Real Estate Center). That gap is not about dirt. It is about permission.

About one in four U.S. homeowner households, and a much larger share of renters, are now "cost-burdened," meaning they spend 30 percent or more of their income on housing. The number of cost-burdened households grew by more than 640,000 in a single year to surpass 20 million, per the Harvard Joint Center for Housing Studies' 2025 report.

Why zoning is the quiet villain

Zoning is the set of local laws that dictate what can be built on a piece of land: how tall, how dense, how far from the street, and often what kind of building at all. In most American cities, 70 to 80 percent of residential land is zoned exclusively for single-family homes, meaning it is illegal to build a duplex, a triplex, or a small apartment building even if there is demand for one. In San Jose, California, that figure has reached as high as 94 percent (Cato Institute).

Think of zoning like a highway with a hard speed limit painted onto the pavement. It does not matter how many cars want to get through or how much horsepower they have. The limit caps the flow regardless of demand. Zoning caps housing supply the same way: no matter how many people want to live near good jobs, transit, or schools, the legal ceiling on what can be built there stays fixed until a city council votes to change it, and that is a slow, politically contentious process.

Minimum lot sizes, parking mandates, and height limits compound the effect. A parking requirement that forces a developer to build two spaces per unit can eat up land that would otherwise hold more housing, and in cities where land is the scarce input, every square meter matters. The National Association of Home Builders has tracked how these overlapping rules stack up city by city, and the pattern holds nationally: more layers of regulation correlate with higher prices, even after controlling for local wages and amenities (NAHB).

How much would loosening zoning actually help?

Simulations that model what would happen if major metro areas adopted the land-use rules of the 25 percent least-restrictive U.S. cities suggest roughly 2.5 million additional housing units would be built over a decade, closing about two-thirds of the estimated national housing shortage. That is a meaningful dent, but it also means zoning reform alone would not fully solve the problem.

The mechanism: how supply, demand, and money interact

Housing prices are set where the willingness to pay meets the willingness (and ability) to build. When demand for a location rises faster than the legal supply of homes there, prices rise to ration the fixed number of available units among more buyers. This is standard supply-and-demand economics, but housing has three features that make it behave differently than most goods.

First, housing is durable. A home built in 1985 is still a home in 2026, so the total stock changes slowly even when new construction picks up. Second, housing is local. You cannot substitute a cheap home in a low-demand region for a job that only exists in an expensive metro, so national averages hide extreme local variation. Third, housing is financed with debt, which means small changes in interest rates produce large changes in what buyers can afford to bid, even if the underlying value of the home has not changed at all.

That third point explains a lot of the confusion people feel about 2023 through 2026. Mortgage rates climbed sharply from the near-zero levels of the pandemic years, which should have cooled prices. Instead, prices mostly held steady or kept rising in many markets. The reason is that existing homeowners who locked in low rates before the increase have little incentive to sell and give up that rate, a phenomenon researchers at the Harvard Joint Center for Housing Studies call rate lock. Fewer existing homes hit the market, so even reduced buyer demand meets an even more reduced supply of listings, and prices stay elevated (JCHS).

Why doesn't the free market just build its way out of this?

Builders respond to profit, not to the general public's need for cheaper housing. If regulation, land cost, and construction cost make it unprofitable to build anything except large, expensive homes, that is what gets built. Builders are not withholding cheap housing out of malice; the economics of the site, permitting process, and financing simply do not pencil out for it.

Construction costs are rising too, not just land and rules

Even where zoning allows dense construction, the cost of physically building a home has climbed. Labor shortages are a structural problem: roughly one-third of U.S. construction workers are immigrants, and tightened immigration enforcement combined with an aging existing workforce has shrunk the labor pool available for new projects. Material costs have also risen, and new tariffs on construction materials are estimated to add about $10,900 to the price of a typical new home, according to the Harvard Joint Center for Housing Studies' 2025 analysis.

This matters because it shows that even a city with perfect zoning reform would still face a floor on how cheap new construction can get. Land-use rules explain why supply cannot expand where demand is highest, but rising material and labor costs explain why even permitted, buildable land does not always turn into affordable homes.

Driver	What it does to price	Who is most affected
Restrictive zoning	Caps the legal number of homes in high-demand areas, forcing buyers to compete for a fixed supply	Renters and first-time buyers in dense, high-job metros
Mortgage rate lock-in	Discourages existing owners from selling, shrinking the resale supply even when demand cools	Buyers competing for a thinner pool of listings
Construction labor shortages	Slows new-home delivery and raises builder costs, which get passed to buyers	New-construction buyers and renters in growing metros
Material costs and tariffs	Adds a fixed dollar amount to every new home regardless of location	Entry-level and starter-home buyers, where added cost is a larger share of price
Stagnant income growth	Widens the gap between home prices and what a typical household can afford to borrow	Middle- and lower-income households, especially renters

What people get wrong about housing prices

The most common misconception is that housing costs are mainly driven by investors or foreign buyers hoarding property. Institutional and foreign investment does exist and matters in specific submarkets, but national research consistently points to supply constraints from zoning and construction costs as the dominant driver, not speculative buying. Blaming investors alone is emotionally satisfying because it identifies a clear villain, but it does not explain why prices are high even in metros with minimal institutional investment.

A second misconception is that "just build more houses" is a simple, universally agreed-upon fix. It is directionally correct, but the type of housing matters enormously. Building large single-family homes on the urban fringe does little to relieve pressure on housing near jobs and transit, where demand is concentrated. The research on zoning specifically targets allowing more units, like duplexes, triplexes, and mid-rise apartments, inside existing high-demand neighborhoods, not simply expanding the total housing stock anywhere it is cheapest to build.

A third misconception treats interest rates and prices as moving in lockstep, when in practice they can decouple for years. The 2023 to 2026 period is the clearest recent example: rates rose sharply, yet prices in most metros did not fall to match, because the rate-lock effect suppressed the supply of homes for sale at the same time higher rates suppressed demand. Both sides of the market shrank together, leaving the price roughly where it started.

Not every regulatory constraint is bad, either. Some land-use rules exist for legitimate reasons like fire safety, infrastructure capacity, or protecting flood-prone land from development. The research on zoning's cost impact is not an argument for eliminating all regulation. It is an argument that many current rules, particularly blanket single-family-only zoning across entire cities, go well beyond what those legitimate goals require.

Where zoning came from, and why it stuck

Modern American zoning was not designed as a neutral tool for organizing cities. New York City passed the country's first comprehensive zoning ordinance in 1916, driven partly by Fifth Avenue merchants who wanted to keep garment factories and the immigrant workers who staffed them out of their shopping district. That same year, Berkeley, California became the first U.S. city to adopt single-family-only zoning, for the Elmwood neighborhood, at the urging of developer Duncan McDuffie, whose properties came bundled with racial covenants barring sale or rental to non-white residents (Pacific Legal Foundation; KQED).

The idea spread with remarkable speed. In 1916, eight U.S. cities had zoning ordinances. By 1936, that number had grown to 1,246 (Pacific Legal Foundation). After the Supreme Court struck down explicit racial zoning in 1917's Buchanan v. Warley, city planners shifted to rules that were silent on race but achieved similar segregation by economic proxy: banning apartments and small multi-family buildings kept out lower-income households, who were disproportionately people of color, without ever naming race in the ordinance text.

That history matters for a practical reason, not just a moral one. It explains why single-family-only zoning is so entrenched and so difficult to reform. The rules were not built as a response to a housing shortage, a traffic problem, or an infrastructure limit. They were built to lock in a particular pattern of who lived where, and a century later, most American cities still run on the zoning maps that grew out of that era, layered with decades of added parking minimums, lot-size rules, and height caps.

What Tokyo does differently, and what it proves

If zoning is really the dominant driver of high housing costs, the cleanest test is a big, wealthy, land-constrained city that regulates land use in a fundamentally different way. Tokyo is that test case, and the result is stark: since 2000, inflation-adjusted house prices in Tokyo have stayed roughly flat, while prices in New York City and San Francisco have more than doubled over the same period (Sightline Institute).

Japan's 1968 New City Planning Law created 12 standardized, nationally defined land-use zones that apply uniformly across the country, replacing the patchwork of hyper-local rules that dominate American zoning. Under this system, apartments, small shops, and mixed-use buildings are legal in all but two of the twelve zones, and local governments have much less power to block individual projects than a typical American city council or planning commission does (Sightline Institute). Tokyo's annual housing starts alone roughly equal the combined housing starts of New York City, Los Angeles, Boston, and Houston, four of the largest metro areas in the United States, put together.

This is not a claim that Japan's system is flawless or directly transplantable. Japanese housing has other quirks, including a cultural and tax-driven pattern of tearing down and rebuilding homes every few decades rather than treating them as long-term assets. But the core lesson researchers draw from Tokyo is narrow and testable: when the legal ceiling on what can be built is set high and centrally, rather than low and locally, housing supply can expand fast enough to absorb strong demand without prices spiraling, even in one of the most expensive, densely populated regions on Earth.

How does U.S. housing affordability compare to other countries?

By one common international measure, the OECD's house-price-to-income index, the United States actually ranks among the more affordable advanced economies, while Portugal, the Netherlands, and Canada post the highest ratios, all exceeding 130 index points against an OECD average of about 115 (OECD Affordable Housing Database). That national average, however, hides enormous variation within the U.S. between expensive coastal metros and cheaper inland regions, which is exactly the local, submarket-driven pattern the zoning research points to.

The labor pipeline behind every unbuilt home

Even in metros that have loosened zoning, someone still has to physically build the housing, and the U.S. construction industry has a persistent worker shortfall. Associated Builders and Contractors estimated the industry needed roughly 439,000 additional workers in 2025 to meet demand, with a further net gap of about 349,000 workers projected for 2026 (Construction Dive).

The shortage is structural, not cyclical, which is an important distinction. The National Center for Construction Education and Research estimates roughly 41 percent of the current construction workforce will retire by 2031, and there are not enough younger workers entering the trades to replace them (ABC RMC). Layered on top of that demographic wave, tightened immigration enforcement has directly disrupted project timelines: the Associated General Contractors of America found that immigration enforcement actions affected nearly one in three construction firms in a 2025 survey, and workforce shortages remain the single leading cause of project delays industry-wide (AGC of America).

Why can't builders just pay more to attract workers?

They can, and often do, but higher wages get passed straight into the price of the finished home rather than solving the underlying shortage. Construction is a skilled trade with a multi-year training pipeline; raising pay attracts workers over time, but it cannot conjure a licensed electrician or framing crew overnight the way raising a retail wage can fill a cashier shift within weeks.

The takeaway

Housing is expensive because several systems that normally correct imbalances, supply responding to demand, prices responding to interest rates, are all currently constrained at once: legally by zoning, physically by construction costs and labor shortages, and financially by rate lock-in that keeps existing homes off the market. No single policy lever, whether it is zoning reform, interest rate cuts, or subsidies, fully solves the problem alone, because each one addresses a different bottleneck in the same pipeline. The reforms most researchers agree would move the needle furthest are the ones that let more homes get legally built in the places people most want to live, since that is the constraint binding hardest across nearly every expensive market in the country.

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Frequently Asked Questions

Q: Why is housing so expensive right now? A: Housing is expensive because restrictive zoning limits how many homes can legally be built in high-demand areas, mortgage rate lock-in keeps existing homeowners from selling, and rising construction labor and material costs make new homes costlier to build, all at the same time.

Q: Is zoning really the biggest factor in high home prices? A: Research from economists like Edward Glaeser and Joseph Gyourko finds land-use regulation adds $100,000 to $400,000 to home costs in the most restrictive U.S. markets, making it one of the largest single factors, though not the only one.

Q: Why haven't rising interest rates brought home prices down? A: Higher rates should reduce demand, but they also discourage existing owners from selling and losing their lower locked-in rate. That "rate lock" effect shrinks the supply of homes for sale at the same time demand falls, so prices stay elevated instead of dropping.

Q: Would building more homes actually fix the problem? A: Simulations suggest loosening zoning to match the least-restrictive quarter of U.S. cities could add about 2.5 million homes over a decade and close roughly two-thirds of the estimated national housing shortage, but construction labor and material costs would still set a floor on affordability.

Q: Are investors and foreign buyers the main reason housing is unaffordable? A: National research points to supply constraints from zoning and construction costs as the dominant driver of high prices, not investor or foreign buying, though investment activity can matter significantly in specific local submarkets.

Q: How does U.S. housing zoning compare to other countries? A: The U.S. relies on hyper-local zoning set by individual city councils, which produces wide variation between metros. Japan, by contrast, uses a national zoning code with just 12 standardized land-use categories that allow apartments and mixed-use buildings almost everywhere, which researchers credit with keeping Tokyo's inflation-adjusted home prices roughly flat since 2000 even as New York and San Francisco prices more than doubled.

Q: Is the U.S. construction labor shortage making housing more expensive? A: Yes. Associated Builders and Contractors estimated the industry needed about 439,000 additional workers in 2025, and roughly 41 percent of the current workforce is expected to retire by 2031, a structural gap that slows new-home delivery and raises the labor cost builders pass on to buyers.

Q: Did zoning start as a response to overcrowding, or something else? A: Early U.S. zoning, including the first single-family-only ordinance in Berkeley, California in 1916, was explicitly tied to excluding immigrants and people of color from certain neighborhoods. After the Supreme Court banned explicit racial zoning in 1917, cities shifted to race-neutral rules, like banning apartments, that achieved similar exclusion through economic proxies, and those rules remain the legal foundation of most U.S. zoning maps today.

Sources

• Harvard Joint Center for Housing Studies, "The State of the Nation's Housing 2025"
• Harvard JCHS, "Home Prices and Rents Remain High as Steep Interest Rates Lock Homeowners in Place"
• Wharton Zell/Lurie Real Estate Center, "The Impact of Zoning on Housing Affordability"
• Cato Institute, "Zoning, Land-Use Planning, and Housing Affordability"
• NAHB, "How Zoning Regulations Affect Affordable Housing"
• Pacific Legal Foundation, "America's Sordid History of Exclusionary Zoning"
• KQED, "The Racist History of Single-Family Home Zoning"
• Sightline Institute, "Yes, Other Countries Do Housing Better, Case 1: Japan"
• OECD Affordable Housing Database, "Housing Prices"
• Construction Dive, "Construction's new worker demand drops to 350,000 in 2026"
• ABC RMC, "Navigating the Construction Worker Shortage in 2025"
• Associated General Contractors of America, "Construction Workforce Shortages Are Leading Cause Of Project Delays"