A reported 676,000 for new single-family homes in September is not a count of houses sold that month. It is the pace Census and HUD say sales were running at, adjusted for the season and scaled up to a full year, and the 8.4 months of supply that comes with it is measured against that pace. The release also says the movement behind the number sits inside its margin of error.
A pace scaled to a year, not a September tally
The Census Bureau and the Department of Housing and Urban Development released the figures Oct. 27 and put new single-family sales at a seasonally adjusted annual rate of 676,000. Adjusting for the time of year strips out the usual spring rush and winter lull, and annualizing states the result as if the month’s pace lasted twelve months. Neither step turns the figure into a tally of closings or contracts.
August’s rate was 680,000 and September 2025’s was 714,000, so the new reading is 0.6% below the prior month and 5.3% below a year earlier. Those are the release’s own comparisons, and both come with a caution attached that a reader of the headline number would never see.
The caution is a margin of error. The release prints a 90 percent confidence interval of plus or minus 13.8% on the monthly change and 12.5% on the yearly change. Each reported drop is smaller than its interval, which means the survey cannot rule out that sales were flat or even higher. Calling September a decline would claim more than the release does.
For homeowners 60 and older wondering whether this is a market for making an offer, the release answers only a narrow part of the question. It describes newly built houses sold across the country. It says nothing about a given town, a given builder or a given house, and its supply figure carries the same limits.
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What 8.4 months of supply measures
The release puts supply at 8.4 months at the current sales rate. That ratio is built from 476,000 new houses for sale at the end of September, seasonally adjusted. The stock was 481,000 in August and 487,000 a year earlier, down 1.0% and 2.3%, and the yearly change sits inside a margin of 4.0%.
Supply was 8.5 months in August and 8.2 months in September 2025. Against those, 8.4 months is down 1.2% on the month and up 2.4% on the year, with margins of 14.7% and 14.1%. Both changes sit well inside the margins, so the fair reading is that new-home supply held roughly steady.
The ratio moves when either side does. Fewer houses on the market or a faster sales pace shortens it, and more houses or a slower pace stretches it. Someone who sees 8.4 months should read a relationship between two estimates, each with its own error, and not a clock counting down to an empty market.
Median $400,400, average $472,800, and what they are set against
The median price of new houses sold was $400,400, up from $385,400 in August and down from $416,800 a year earlier. The median’s monthly gain of 3.9% carries a margin of 6.2%, and its yearly drop of 3.9% a margin of 8.9%. Neither move is large enough for the survey to call.
The average sales price was $472,800, against $506,800 in September 2025. That 6.7% yearly drop is the one price change in the release that clears its 6.6% margin. An average is pulled by the most expensive sales, so the drop can reflect fewer high-priced houses sold and not a fall in what a typical new house costs.
A separate trade-group survey measures a different market. The National Association of Realtors reported a median existing-home price of $417,500 for September, which means the typical new house in the Census sample sold for less than the typical existing one. The two come from different surveys, and NAR’s median is not seasonally adjusted, so the gap is a loose comparison and not a ruling on value.
Financing costs have not eased either. The Federal Reserve held its target range at 3-3/4 to 4 percent on Oct. 28, voting 10-2, with Lisa Cook and Beth Hammack preferring a quarter-point increase. The statement says inflation remains elevated and does not mention housing.
What a national supply figure cannot say about a house already owned
Most homeowners over 60 do not live in a newly built house. They own an existing one, and NAR counts that market separately; its September reading was 4.8 months of supply, built on a different survey and a different method from Census’s 8.4 months. The two numbers describe different markets and should not be netted against each other.
What an existing house costs to keep and what it is worth are set locally. The county assessor sets the value that property tax is based on, an insurer prices the policy, and a lender or a buyer prices the equity. None of those inputs appears anywhere in a national new-home release.
The September report therefore supports two plain statements. New single-family sales ran at a 676,000 seasonally adjusted annual rate, and supply stood at 8.4 months. Neither moved by more than the survey can tell apart from noise, whether the comparison is August or last year.
What the report leaves open is direction. A reading inside its margin can be revised or reversed by the next release, so one month at 8.4 months is a reason to watch the next report and not a signal about the price of any one house.
Trying to time a move on a new house?
A national supply number cannot say what a particular house costs a homeowner to keep or what it would sell for, and for owners over 60 those two figures come from the county assessor, the insurer and the lender, not from Census.
That is the turn from this report to Cut Your House Costs: from a national supply statistic to what the reader’s own house costs and is worth. It covers a lower home insurance bill by shopping and asking for every discount, and home equity options compared, from a HELOC to a reverse mortgage.
Inside are the home-cost audit worksheet and a section on selling without the tax, up to $250,000 of profit or $500,000 for a couple.
Audit what the house costs before a move: get the home-cost audit worksheet →
This article was produced with AI assistance and edited for accuracy against the sources linked above.
