After taking a breather last month, the affordability of the typical new home sold in the U.S. nose-dived in September 2022.

That negative change is a consequence of two main factors. First, the price of a median new home spiked up about 8% to an initial estimate of $470,600 in September 2022, the second-highest figure on record (July 2022's $479,800 is the current record-holder).

The second factor is the surge in mortgage rates in September 2022. The interest rate for a 30-year conventional mortgage jumped from an average of 5.22% in August to 6.11%. The following chart shows the combined effect of these two factors, as measured by the percentage of a typical American household's monthly income that would have to go to pay a mortgage payment on the typical new home sold.

At an initial estimate of 43.6% for September 2022's median household income, the cost of owning a typical new home has never been higher for a typical American household. That's also true in terms of raw affordability, where the median household income would only cover 17.1% of the sale price of the median new home sold in September 2022.

But the spike in ownership cost for a new home may not be over yet. Although the post-pandemic recession rise of new home prices is slowing, mortgage rates reached over the 7% threshold in October 2022. Unless the median price of new homes falls because of crashing demand as some observers anticipate, next month could see another new low in their relative affordability.

References

U.S. Census Bureau. New Residential Sales Historical Data. Houses Sold. [Excel Spreadsheet]. Accessed 26 October 2022. 

U.S. Census Bureau. New Residential Sales Historical Data. Median and Average Sale Price of Houses Sold. [Excel Spreadsheet]. Accessed 26 October 2022. 

Freddie Mac. 30-Year Fixed Rate Mortgages Since 1971. [Online Database]. Accessed 26 October 2022.

Political Calculations. Median Household Income in September 2022. [Online Article]. 1 November 2022.

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