A White House economic report released in April 2026 says the United States is at least 10 million single-family homes short. Inman's coverage reports the claim that way, and AP's report on the document, dated 13 April 2026, carries the headline that it lays out a blueprint to fix the problem. Treat 10 million as a government claim, not a consensus. Other estimates cited in that coverage run from roughly 1 million to 10 million homes. The National Association of Home Builders gives a figure of about 1.2 million units in its 2026 outlook.
Why the shortage numbers disagree
Most of the gap between estimates comes from method rather than one source being careless. Figures differ by year, by whether they count homes, units or floor space, and by whether they cover single-family houses or all housing. A secondary compilation notes that its estimates use different methods and years. It lists Freddie Mac at 3.7 million, Zillow at 4.74 million for 2024, and Brookings at 4.9 million. Those numbers were not checked against the original publications. A Realtor.com figure of 4.03 million appears only in a vendor blog and should be treated as unverified.
What is new and what is long-established
The regulatory story is old and has broad support. A National Bureau of Economic Research working paper that surveys the literature links regulation to higher prices, less construction and lower supply elasticity. It is a survey, not a single decisive study. A 2012 Federal Reserve working paper finds that permitting lags and marginal costs explain much of the difference in supply elasticity across US metro areas, though its data are older.
The newer findings are less settled. Aastveit and co-authors, summarised in a VoxEU column, find that US housing supply became less elastic after the financial crisis, with the largest declines where land-use regulation tightened most. A secondary survey repeats the finding. I did not check the full paper or its robustness tests, so treat it as promising rather than established. Goldman Sachs Research argues that housing productivity has trended lower for decades and that completion times have recently hit record highs. That article cites other research, and its underlying data were not verified.
The most recent data are the weakest. An aggregator reports about 1.27 million homes under construction in August 2026, 3.2% fewer than a year earlier. Primary Census and NAHB figures for those months were not retrieved, so read this as a low-confidence signal.
Why building takes years
Lags and short-run elasticity
A Federal Reserve Finance and Economics Discussion Series paper uses a novel dataset of US residential land developments. It finds that the average time to develop residential property, meaning land preparation plus construction, is about three years, and that the time varies widely by location. The paper argues that these long, dispersed development times help explain how much supply responds to local business-cycle swings. This is a model-based result, not a settled consensus, and the author attribution was not verified.
The mechanism is straightforward. When prices rise, builders can only add homes that are already in the pipeline or that can be finished quickly. If land and construction take years, the extra supply arrives after the price spike has faded. The same research implies that short-run supply can be unresponsive even in places where long-run supply could expand.
Permits, zoning and marginal costs
Permitting delays push the problem further out. When approvals are slow, developers must forecast further ahead, which weakens the link between today's prices and next year's construction. Marginal costs add to this. Each extra home built in a given year tends to cost more than the last, because the easiest sites and fastest crews are used first. That helps explain why a price signal does not translate evenly into new units from one metro to another.
Why supply falls slowly while demand can drop fast
Housing responds asymmetrically. According to Brookings, existing homes do not disappear when demand weakens. The surplus shows up as vacant houses, and the existing stock sets a floor under the market. Demand can shift within months, but the housing stock changes over years. Houses are durable, land is fixed, and most homes are built on site, so a sudden rise in buyers cannot be matched quickly. The Brookings analysis is qualitative rather than a dataset, but it fits the lag evidence above.
Costs, labour and tariffs
A Congressional Research Service report (R48892) frames material costs, tariffs, immigration limits and labour constraints as pressures on builders. The material I reviewed does not quantify the 2025 to 2026 effects, so there is no reliable figure for how much these changes have slowed construction. A separate CRS report (R47617) says construction never fully recovered from the 2007 crash, leaving an underbuilding gap whose size is contested.
Counter-evidence and the demand side
Supply is not the whole story. A 2025 Federal Reserve Bank of San Francisco working paper argues that supply constraints do not explain city-level house price and quantity patterns the way the standard story predicts, and that income growth matters. I read only excerpts. A blog summary of post-2008 research attributes the drop in elasticity to the mortgage crackdown rather than to supply constraints. That explanation is disputed, and neither account should be presented as settled.
Measurement matters too. One paper argues that elasticities based on unit counts may be biased downward. A preliminary AEA paper estimates short-run elasticities of 0.01 to 0.42 at the county level and 0.01 to 0.20 at the municipality level, and argues that earlier estimates overstated responsiveness by a large margin. Because it is preliminary, its figures may change. On the demand side, borrowing costs determine how many buyers can act on rising prices. For that side of the market, see how interest rate decisions affect mortgage rates.
What to check next
When you see a shortage figure, check three things: the year, the unit being counted (homes, units or space), and whether the count covers single-family houses only. A large gap between two estimates often reflects those definitions rather than a mistake.
For updates, use primary releases rather than aggregators. That means NAHB's outlook, Census permit and construction data, and the full texts of the Federal Reserve and AEA papers. The 10 million claim, the Realtor.com figure and the August 2026 construction numbers all still need primary confirmation. The practical lesson is about timing. Even if policy changed quickly, the lags described above mean new supply would arrive over years, so prices can adjust faster than building does.